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    Experiment No. (3) Experiment Name: Forced Convection Heat Transfer. Objective: To Determine The Heat Transfer Coefficient of Forced Convection of Air

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    wrya hussain
    This 3-sentence summary provides the key details about the document: The document describes an experiment to determine the heat transfer coefficient of forced convection for air flowing inside a tube. The apparatus includes a control panel, blower, test section with internal heater, and orifice. The procedure involves supplying power to the control unit and heater, starting the blower, recording temperatures and pressure readings, and calculating the average heat transfer coefficient.

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    Experiment No. (3) Experiment Name: Forced Convection Heat Transfer. Objective: To Determine The Heat Transfer Coefficient of Forced Convection of Air

    Uploaded by

    wrya hussain
    27 views3 pages
    This 3-sentence summary provides the key details about the document: The document describes an experiment to determine the heat transfer coefficient of forced convection for air flowing inside a tube. The apparatus includes a control panel, blower, test section with internal heater, and orifice. The procedure involves supplying power to the control unit and heater, starting the blower, recording temperatures and pressure readings, and calculating the average heat transfer coefficient.

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    This 3-sentence summary provides the key details about the document: The document describes an experiment to determine the heat transfer coefficient of forced convection for air flowing inside a tube. The apparatus includes a control panel, blower, test section with internal heater, and orifice. The procedure involves supplying power to the control unit and heater, starting the blower, recording temperatures and pressure readings, and calculating the average heat transfer coefficient.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    27 views3 pages

    Experiment No. (3) Experiment Name: Forced Convection Heat Transfer. Objective: To Determine The Heat Transfer Coefficient of Forced Convection of Air

    Uploaded by

    wrya hussain
    This 3-sentence summary provides the key details about the document: The document describes an experiment to determine the heat transfer coefficient of forced convection for air flowing inside a tube. The apparatus includes a control panel, blower, test section with internal heater, and orifice. The procedure involves supplying power to the control unit and heater, starting the blower, recording temperatures and pressure readings, and calculating the average heat transfer coefficient.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 3

    Erbil Polytechnic University

    Technical Engineering College


    Mechanical and Energy Engineering Department
    Heat Transfer Laboratory / 3rd Class

    Experiment No. (3)


    Experiment Name: forced convection heat transfer.
    Objective: To determine the heat transfer coefficient of forced convection of air
    inside the tube.
    Introduction:
    In many practical situations and equipment’s, we invariably deal with flow
    of fluids in tubes e.g. boiler, super heaters and condensers of a power plants,
    automobile radiators, water and air heaters or coolers etc. The knowledge and
    evolution of forced convection heat transfer coefficient for fluid flow in tubes is
    essentially a prerequisite for an optional design of all thermal system.
    Convection is the transfer of heat within a fluid by mixing of one portion of
    fluid with the other. Convection is possible only in a fluid medium and is directly
    linked with the transport of medium itself.
    In forced convection, fluid motion is principally produced by some
    superimposed velocity fluid like a fan, blower or a pump; the energy transport is
    said due to forced convection.
    Apparatus:
    Shown in the attached figure, part of the devices included in this experiments
    that you are going to deal with are: control panel, blower, test section, heater and
    orrifice.
    Theory and Calculation:
    do: orifice diameter= 30mm
    L: length of the test section =600mm
    C d: Coefficient of discharge=0.68

    ρ a: air density=1.03 kg/m3

    ρ w: water density=1000 kg/m3

    g: Acceleration due to gravity=9.81m/s2

    C p: specific heat of air=1.005 kj/kg

    Do: outer diameter of the pipe= 33mm


    Di: inner diameter of the pipe = 26mm
    h: heat transfer coefficient in W/m2.K
    Ao: area of cross section of orifice in m2
    As: test section surface area in m2
    H: manometer reading in meter
    ma: mass flowrate of air kg/s
    Qa: heat carried away by air
    Ta: average temperature of air in ℃
    Ts: average surface temperature in℃
    Ṽ : volme flowrate in m3/s

    Qa
    h=
    A s (T s−T a )
    A s=π∗Di∗L
    T 2+T 3 +T 4 +T 5
    T s=
    4
    T 1 +T 6
    T a=
    2
    Q a=m a∗C p∗(T 6 −T 1 )
    m a=Ṽ ∗ρ a

    ρw
    Ṽ =Cd∗A o∗ 2∗g∗H∗(
    √ ρa
    )
    ( π4 )∗d
    Ao = o
    2

    Procedure:
    1. Give supply to control unit.
    2. Switch on the control unit by pressing the red switch given on backside of
    control unit.
    3. With the help of up key see all the six temperatures on control unit display.
    4. Now give supply to heater by rotating the knob H2.
    5. Also start the blower by rotating knob H1. Set the desired blower speed.
    6. After getting the proper steady state, all the observation are recorded.

    Readings:

    No. Heat input Temperature ℃ Manometer reading


    watts of water (mm)

    Q T1 T2 T3 T4 T5 T6 H

    Calculations:
     Calculate the average heat transfer coefficient.
     Plot a curve of temperature distribution.

    Discussion:

    Discuss the results you get it and write your conclusion about it.

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