CN113441301B - Single-phase internal shearing nozzle for atomizing shearing thinning fluid - Google Patents
Single-phase internal shearing nozzle for atomizing shearing thinning fluid Download PDFInfo
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- CN113441301B CN113441301B CN202110825080.4A CN202110825080A CN113441301B CN 113441301 B CN113441301 B CN 113441301B CN 202110825080 A CN202110825080 A CN 202110825080A CN 113441301 B CN113441301 B CN 113441301B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
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Abstract
The invention discloses a single-phase internal shear nozzle for atomizing shear-thinning fluid, which comprises: an upper nozzle inlet piece, an intermediate internal cutting piece and a lower nozzle outlet piece, the intermediate internal cutting piece being arranged between the upper nozzle inlet piece and the lower nozzle outlet piece. This one-way internal shear nozzle can carry out a lot of shearing to liquid through the setting of middle internal shear spare, has reduced near nozzle outlet's fluid viscosity, has strengthened liquid fluidic unstability and breakage, has improved the atomization effect, and this nozzle simple structure, the good reliability is convenient for maintain moreover.
Description
Technical Field
The invention relates to the technical field of atomizing nozzles, in particular to a single-phase internal shearing nozzle for atomizing a shearing thinning fluid.
Background
non-Newtonian fluids are present in large quantities in human productive life, for example, body fluids such as blood plasma and lymph fluid, as well as asphalt melt paste, starch paste and the like which are common in life are non-Newtonian fluids. Gel propellants and the like used, for example, in rocket motors are also within the category of non-newtonian fluids. Unlike newtonian fluids, the shear force of non-newtonian fluids is no longer a simple linear relationship to the rate of shear deformation. Due to the unique rheological characteristics of non-Newtonian fluids, the non-Newtonian fluids can show different behavior characteristics from Newtonian fluids in flow, such as climbing rod effect, pipeless siphon and turbulence drag reduction, and the non-Newtonian fluids have wide potential application in daily life and industrial production.
Shear-thinning fluids are typically non-newtonian fluids whose rheological behavior is shown in the rheological curve of the shear-thinning fluid of fig. 1, where the x-axis represents shear rate (1/s) and the y-axis represents apparent viscosity (mPa · s), and it can be seen from fig. 1 that the macroscopic viscosity of the shear-thinning fluid gradually decreases with increasing shear rate. For example, the gel propellant in the rocket engine belongs to one kind of shear thinning fluid, and has the advantages of short preparation time of the solid propellant, easy storage, multiple starting of the liquid propellant and adjustable thrust, so that the gel propellant attracts the research of a large number of scholars at home and abroad, and a series of achievements are obtained. However, due to the high viscosity and complicated and variable rheological characteristics of the shear-thinning fluid, it is difficult to ensure good atomization using conventional pressure nozzles. The problem of atomization is one of the major bottlenecks that restrict the wider application of shear-thinning fluids in industrial production, and has also become the research focus of experts and scholars at home and abroad.
Therefore, it is an urgent need to solve the above-mentioned problems by those skilled in the art to provide a single-phase nozzle with simple structure and high efficiency to improve the atomization effect of the shear-thinning fluid.
Disclosure of Invention
Accordingly, the present invention provides a single-phase nozzle with a simple and efficient structure to improve atomization of a shear-thinning fluid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single phase internal shear nozzle for atomization of a shear-thinning fluid, comprising:
an upper nozzle inlet piece having a first liquid passage penetrating upper and lower surfaces thereof inside;
the lower nozzle outlet part is internally provided with a second liquid channel and a spray outlet which are communicated with each other from top to bottom;
an intermediate internal cutting member, the intermediate internal cutting member comprising: the connecting plate with arrange in first fluid passage with interior shear structure in the second fluid passage, the connecting plate presss from both sides and establishes go up nozzle inlet piece bottom face with between nozzle outlet piece top face down, just go up nozzle inlet piece, the connecting plate with nozzle outlet piece three fixed connection down, the connecting plate middle part is equipped with the through-hole, interior shear structure is arranged in the through-hole, just interior shear structure periphery pass through the floor with through-hole inner hole wall fixed connection, interior shear structure with the space between the through-hole constitutes the intercommunication passageway that is used for the intercommunication first fluid passage with second fluid passage, first fluid passage, second fluid passage the through-hole with the space between the interior shear structure constitutes the fluid shear passageway.
According to the technical scheme, compared with the prior art, the single-phase internal shearing nozzle for atomizing the shear thinning fluid is provided, through the arrangement of the middle internal shearing piece, when the fluid enters the liquid shearing channel, the internal shearing structure shears the fluid, the apparent viscosity of the shear thinning fluid can be reduced, and the cylindrical jet flow generated by the nozzle is easier to break into liquid drops, so that the atomization effect is improved.
Further, the internal shearing structure comprises: anterior segment, middle section, back end, the anterior segment is complete cone structure, the anterior segment is arranged in the first liquid passageway, the tip of anterior segment is close to first liquid passageway's last entrance to a river arranges, the middle section is the cylinder structure, and its week side passes through the floor with pore wall fixed connection in the through-hole, the middle section with space between the through-hole constitutes intercommunication passageway, middle section top end face with the big end fixed connection of anterior segment, the back end is arranged in the second liquid passageway, the back end is for invering and truncated cone structure or complete cone structure, the big end of back end with middle section bottom end face fixed connection.
Adopt above-mentioned technical scheme to produce beneficial effect is, fluid enters into first liquid passage, when the internal shear structure that flows through, because the effect of the change of fluid sectional area and anterior segment, the shear rate of fluid increases, and the viscosity of fluid reduces, and when fluid gets into the circumferential weld of constituteing by back end and second liquid passage, the viscosity further reduces closely, spouts from the atomizing export afterwards. Compared with the traditional direct current nozzle, the single-phase internal shearing nozzle can effectively reduce the apparent viscosity of the shearing thinning fluid and accelerate the instability and rupture of jet flow, thereby achieving the effect of improving atomization. The invention ensures that the effective sectional area of the liquid shearing channel is gradually reduced and the internal shearing rate is gradually increased by arranging the front cone, the rear cone and the convergent cone, thereby reducing the viscosity of the liquid.
Furthermore, the cone angle phi 1 of the front section ranges from 20 degrees to 90 degrees, and the radius D1 of the large end face ranges from 3mm to 8mm; the width range D3 of the communicating channel is 0.5-1.2mm, the thickness L1 is 1-4mm, the range of the taper angle phi 2 of the rear section is 20-90 degrees, the range of the radius D2 of the large end face is 3-8mm, and the range of the height L2 of the truncated cone is 3-8mm.
Furthermore, the number of the rib plates is 2-6, and the width L3 of the rib plates is 0.5-1.2mm.
Furthermore, the inner molded surface of the first liquid channel is a cylindrical surface, the diameter D0 of the first liquid channel ranges from 4mm to 10mm, and the length-diameter ratio ranges from 8mm to 20 mm; the inner profile surface of the second liquid channel is a convergent conical surface, the diameter D4 of the large end surface of the second liquid channel ranges from 4mm to 10mm, the height L4 ranges from 3.5 mm to 9mm, and the convergence angle phi 3 ranges from 20 degrees to 100 degrees; the inner molded surface of the spraying outlet hole is a cylindrical surface, the diameter D5 range is 0.4-1.2mm, and the height L5 of the cylindrical surface is 0.8-2mm.
Furthermore, a resonant cavity is arranged in the spray outlet hole, and the inner molded surface of the resonant cavity is a cylindrical surface, and the diameter of the inner molded surface is larger than that of the spray outlet hole.
The beneficial effect who adopts above-mentioned technical scheme to produce is that, the atomizing export has one section resonant cavity, because the shearing action of the air that exists in the sudden enlargement of flow area and the resonant cavity to the efflux, efflux surface disturbance constantly develops, if frequency, the phase place of disturbance wave are close with the frequency, the phase place of efflux unstability, can aggravate the development of efflux disturbance, cause the efflux disturbance to enlarge, form self-excited oscillation to accelerate the atomizing process of liquid.
Furthermore, the diameter D6 of the resonant cavity ranges from 0.5 mm to 3mm, and the length-diameter ratio ranges from 0.8 mm to 2.
Further, the upper nozzle inlet piece, the lower nozzle outlet piece and the connecting plate are fixed through bolts or welding.
The beneficial effect who adopts above-mentioned technical scheme to produce is, when adopting bolted connection, the dismouting of easy nozzle.
Furthermore, the front section, the middle section and the rear section are integrally formed or welded and fixed.
Furthermore, a first sealing gasket or a first sealing ring is arranged between the top end face of the connecting plate and the bottom end face of the upper nozzle inlet piece, and a second sealing gasket or a second sealing ring is arranged between the bottom end face of the connecting plate and the top end face of the lower nozzle outlet piece.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, avoid liquid to leak.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a graph showing the rheology of a shear-thinning fluid.
FIG. 2 is a schematic structural diagram of a single-phase internal shear nozzle provided by the present invention.
FIG. 3 is a schematic diagram of a single-phase internal shear nozzle with related dimensional references.
Fig. 4 is a schematic structural view of an intermediate internal cutting member according to the present invention.
FIG. 5 is a schematic structural diagram of a resonant cavity arranged at an atomizing outlet of the single-phase internal shearing nozzle provided by the invention.
FIG. 6 is a graph showing the comparison of the atomization effect of the single-phase internal shear nozzle of the present invention and the conventional DC nozzle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, embodiments of the present invention disclose a single-phase internal shear nozzle for atomization of a shear-thinning fluid, comprising:
an upper nozzle inlet 1, the upper nozzle inlet 1 having a first liquid passage 101 penetrating upper and lower surfaces thereof;
a lower nozzle outlet member 2, wherein the lower nozzle outlet member 2 has a second liquid channel 201 and a spray outlet 202 communicated with each other from top to bottom;
an intermediate internal cutting member 3, the intermediate internal cutting member 3 comprising: the connecting plate 31 is clamped between the bottom end face of the upper nozzle inlet piece 1 and the top end face of the lower nozzle outlet piece 2, the upper nozzle inlet piece 1, the connecting plate 31 and the lower nozzle outlet piece 2 are fixedly connected, a through hole 301 is formed in the middle of the connecting plate 31, the internal shearing structure 32 is arranged in the through hole 301, the periphery of the internal shearing structure 32 is fixedly connected with the inner hole wall of the through hole 301 through a rib plate 33, a communicating channel 302 for communicating the first liquid channel 101 with the second liquid channel 201 is formed by a gap between the internal shearing structure 32 and the through hole 301, and the liquid shearing channel 4 is formed by the gap between the first liquid channel 101, the second liquid channel 201, the through hole 301 and the internal shearing structure 32.
The internal shearing structure 32 includes: the liquid level meter comprises a front section 321, a middle section 322 and a rear section 323, wherein the front section 321 is of a complete cone structure, the front section 321 is arranged in the first liquid channel 101, the small end of the front section 321 is arranged close to an upper channel port 1011 of the first liquid channel 101, the middle section 322 is of a cylindrical structure, the peripheral side of the middle section 322 is fixedly connected with the inner hole wall of the through hole 301 through a rib plate 33, a communicating channel 302 is formed by a gap between the middle section 322 and the through hole 301, the top end face of the middle section 322 is fixedly connected with the large end of the front section 321, the rear section 323 is arranged in the second liquid channel 201, the rear section 323 is of an inverted and cut cone structure or a complete cone structure, and the large end of the rear section 323 is fixedly connected with the bottom end face of the middle section 322.
The cone angle phi 1 of the front section 321 ranges from 20 degrees to 90 degrees, and the radius D1 of the large end face ranges from 3mm to 8mm; the width range D3 of the communicating channel 302 is 0.5-1.2mm, the thickness L1 is 1-4mm, the cone angle phi 2 of the rear section 323 is 20-90 degrees, the radius D2 of the large end surface is 3-8mm, and the height L2 of the truncated cone is 3-8mm.
The number of the rib plates 33 is 2-6, and the width L3 of the rib plates 33 is 0.5-1.2mm.
The inner molded surface of the first liquid channel 101 is a cylindrical surface, the diameter D0 of the first liquid channel ranges from 4mm to 10mm, and the length-diameter ratio ranges from 8mm to 20 mm; the inner profile of the second liquid channel 201 is a convergent conical surface, the diameter D4 of the large end surface is 4-10mm, the height L4 is 3.5-9mm, and the convergence angle phi 3 is 20-100 degrees; the inner profile of the spray outlet 202 is cylindrical, with a diameter D5 in the range of 0.4-1.2mm and a cylindrical height L5 of 0.8-2mm.
A resonant cavity 203 is arranged in the spray outlet 202, and the inner profile of the resonant cavity 203 is a cylindrical surface, and the diameter of the resonant cavity is larger than that of the spray outlet 202.
The diameter D6 of the resonant cavity 203 is in the range of 0.5-3mm, and the length-diameter ratio is in the range of 0.8-2.
The upper nozzle inlet member 1, the lower nozzle outlet member 2, and the connecting plate 31 are fixed by bolts or welding.
The front section 321, the middle section 322 and the rear section 323 are integrally formed or welded and fixed.
A first sealing gasket or a first sealing ring 5 is arranged between the top end surface of the connecting plate 31 and the bottom end surface of the upper nozzle inlet part 1, and a second sealing gasket or a second sealing ring 6 is arranged between the bottom end surface of the connecting plate 31 and the top end surface of the lower nozzle outlet part 2.
This single-phase internal shear nozzle during operation, the fluid is through entering into first liquid channel, when the internal shear structure of flowing through, because the effect of fluid cross sectional area's change and anterior segment, fluidic shear rate increases, fluidic viscosity reduces, get into the circumferential weld of constituteing by back end and second liquid channel as fluid, viscosity further reduces, then during the resonant cavity that the runner area enlarges suddenly, efflux surface disturbance constantly develops, if the frequency of disturbance wave, the phase is with the frequency of efflux unstability, the phase is close, can aggravate the development of efflux disturbance, cause the efflux disturbance to enlarge, form self-oscillation, thereby accelerate the atomizing process of liquid, thereby reach and improve atomizing effect, spout through the export of atomizing at last.
FIG. 6 shows a Soteller mean diameter comparison of single phase internal shear nozzle atomization of the present invention versus straight jet nozzle atomization. Wherein the x-axis represents the liquid flow rate (g/s), the y-axis represents the mean diameter (μm), A represents the change in the Soteller mean diameter of the novel internal shear nozzle, and B represents the change in the Soteller mean diameter of the direct flow nozzle. As can be seen from FIG. 6, the single-phase internal shear nozzle of the present invention can effectively reduce the diameter of the atomized droplets of the shear-thinning fluid and increase the fineness of the atomization. And the single-phase nozzle has simple structure, convenient assembly and disassembly, stable work and high reliability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A single phase internal shear nozzle for atomizing a shear-thinning fluid, comprising:
an upper nozzle inlet piece (1), wherein the upper nozzle inlet piece (1) is internally provided with a first liquid channel (101) penetrating through the upper surface and the lower surface of the upper nozzle inlet piece;
the lower nozzle outlet piece (2), the interior of the lower nozzle outlet piece (2) is provided with a second liquid channel (201) and a spray outlet hole (202) which are communicated with each other from top to bottom;
-an intermediate internal cutting member (3), the intermediate internal cutting member (3) comprising: a connecting plate (31) and an internal shearing structure (32) arranged in the first liquid channel (101) and the second liquid channel (201), wherein the connecting plate (31) is clamped between the bottom end face of the upper nozzle inlet piece (1) and the top end face of the lower nozzle outlet piece (2), the upper nozzle inlet piece (1), the connecting plate (31) and the lower nozzle outlet piece (2) are fixedly connected, a through hole (301) is formed in the middle of the connecting plate (31), the internal shearing structure (32) is arranged in the through hole (301), the periphery of the internal shearing structure (32) is fixedly connected with the inner hole wall of the through hole (301) through a rib plate (33), a gap between the internal shearing structure (32) and the through hole (301) forms a communication channel (302) for communicating the first liquid channel (101) and the second liquid channel (201), and a gap between the first liquid channel (101), the second liquid channel (201), the through hole (301) and the internal shearing structure (32) forms a liquid shearing channel (4);
the inner shear structure (32) comprises: the liquid level sensor comprises a front section (321), a middle section (322) and a rear section (323), wherein the front section (321) is of a complete cone structure, the front section (321) is arranged in the first liquid channel (101), the small end of the front section (321) is arranged close to an upper channel opening (1011) of the first liquid channel (101), the middle section (322) is of a cylindrical structure, the outer peripheral side of the middle section (322) is fixedly connected with the inner hole wall of the through hole (301) through the rib plates (33), a gap between the middle section (322) and the through hole (301) forms the communicating channel (302), the top end face of the middle section (322) is fixedly connected with the large end face of the front section (321), the rear section (323) is arranged in the second liquid channel (201), the rear section (323) is of an inverted and truncated cone structure or a complete cone structure, and the large end of the rear section (323) is fixedly connected with the bottom end face of the middle section (322);
the inner molded surface of the first liquid channel (101) is a cylindrical surface, the diameter D0 range of the first liquid channel is 4-10mm, and the length-diameter ratio range of the first liquid channel is 8-20; the inner profile surface of the second liquid channel (201) is a convergent conical surface, the diameter D4 of the large end surface of the second liquid channel is 4-10mm, the height L4 of the second liquid channel is 3.5-9mm, and the convergence angle phi 3 of the second liquid channel is 20-100 degrees; the inner molded surface of the spray outlet (202) is a cylindrical surface, the diameter D5 ranges from 0.4 mm to 1.2mm, and the height L5 of the cylindrical surface ranges from 0.8 mm to 2mm.
2. A single phase internal shear nozzle for the atomization of shear-thinning fluids according to claim 1, wherein the leading section (321) has a cone angle Φ 1 in the range of 20 ° -90 ° and a major end face diameter D1 in the range of 3-8mm; the width range D3 of the communicating channel (302) is 0.5-1.2mm, the thickness L1 is 1-4mm, the cone angle phi 2 range of the rear section (323) is 20-90 degrees, the diameter D2 range of the large end face is 3-8mm, and the height L2 range of the truncated cone is 3-8mm.
3. A single phase internal shear nozzle for the atomization of a shear-thinning fluid according to claim 1, wherein the number of said ribs (33) is 2-6, and the width L3 of said ribs (33) is 0.5-1.2mm.
4. A single phase internal shear nozzle for the atomization of shear-thinning fluids according to any of claims 1 to 3, wherein a resonant cavity (203) is provided in said spray exit orifice (202), said resonant cavity (203) having an internal profile that is cylindrical and has a diameter that is greater than the diameter of said spray exit orifice (202).
5. A single phase internal shear nozzle for atomization of a shear thinning fluid according to claim 4, wherein the resonant cavity (203) has a diameter D6 in the range of 0.5-3mm and an aspect ratio in the range of 0.8-2.
6. A single phase internal shear nozzle for atomizing a shear thinning fluid according to claim 1, wherein said upper nozzle inlet piece (1), said lower nozzle outlet piece (2), said connecting plate (31) are fixed by bolting or welding.
7. The single-phase internal shear nozzle of claim 1, wherein said forward section (321), said intermediate section (322), and said aft section (323) are integrally formed or welded together.
8. A single phase internal shear nozzle for the atomization of shear-thinning fluids according to claim 1, wherein a first gasket or seal (5) is provided between the top face of the connecting plate (31) and the bottom face of the upper nozzle inlet (1), and a second gasket or seal (6) is provided between the bottom face of the connecting plate (31) and the top face of the lower nozzle outlet (2).
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| CN202110825080.4A CN113441301B (en) | 2021-07-21 | 2021-07-21 | Single-phase internal shearing nozzle for atomizing shearing thinning fluid |
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| CN202110825080.4A CN113441301B (en) | 2021-07-21 | 2021-07-21 | Single-phase internal shearing nozzle for atomizing shearing thinning fluid |
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| CN113441301B true CN113441301B (en) | 2022-10-11 |
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| CN114308323B (en) * | 2021-11-03 | 2023-01-03 | 中北大学 | High-shear preparation method and device of nanofluid |
| CN114130560B (en) * | 2021-12-06 | 2022-09-23 | 合肥工业大学 | Sophorolipid compound for improving soil and spraying device |
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| US7032843B1 (en) * | 2003-04-24 | 2006-04-25 | Westland Corporation U.S.A., Inc. | Mixing nozzle |
| ATE532585T1 (en) * | 2005-08-24 | 2011-11-15 | Brother Ind Ltd | FILM FORMING APPARATUS AND JET NOZZLE |
| US7735756B2 (en) * | 2006-04-12 | 2010-06-15 | Combustion Components Associates, Inc. | Advanced mechanical atomization for oil burners |
| DE102009037828A1 (en) * | 2008-11-11 | 2010-05-20 | Wurz, Dieter, Prof. Dr. | Two-fluid nozzle, bundling nozzle and method for atomizing fluids |
| JP6351461B2 (en) * | 2014-05-09 | 2018-07-04 | 株式会社エンプラス | Nozzle plate for fuel injector |
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| CN209588046U (en) * | 2019-02-25 | 2019-11-05 | 中国石油大学(华东) | A kind of oil burner self-pulsating nozzle |
| CN110594041B (en) * | 2019-09-09 | 2021-01-05 | 北京航空航天大学 | Self-oscillation nozzle for atomizing granular gel-containing propellant of ramjet engine |
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