Due to its implicit invocation nature ofAspect Oriented Programming (AOP), locating a jointpoint ... more Due to its implicit invocation nature ofAspect Oriented Programming (AOP), locating a jointpoint for executing aspect is extremely difficult. Hence,it becomes difficult to understand the application’sflow and behavior. Current AOP visualization tools havelimitations such as high dependency on other tools,confusing and excessive use of color to represent aspectsand using an outdated version of AspectJ. In thispaper, we propose a new approach collapsibletabular visualization tool to visualize and represent AOPfeatures to aid the programmers in betterunderstanding AOP applications. We have come outof traditional color-based aspect visualization and developeda web based tool: AspectViz that visualizes the aspects ina simple collapsible table. A questionnaire containingfour different questions related to aspects visualizationwas developed to compare AspectViz with currentvisualization tools. 20 graduate students andprofessional software developers were invited to participatein the test e...
Proceeding of Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India, 2022
Proceeding of Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India, 2022
To my parents for their endless love and support A general description of a thermally coupled flu... more To my parents for their endless love and support A general description of a thermally coupled fluid flow is given by the incompressible Navier-Stokes equations coupled with the heat equation using Boussinesq approximation, whose mathematical structure is much well understood. A variational multiscale finite element approximation has been considered for the formulation of incompressible Navier-Stokes equation and heat equation. The complexity of these problems makes their numerical solution very difficult as the standard finite element method is unstable. In the incompressible Navier Stokes equations, two well known sources of numerical instabilities are the incompressibility constraint and the presence of the convective term. Many stabilization techniques used nowadays are based on scale separation, splitting the unknown into a coarse part induced by the discretization of the domain and a fine subgrid part. The mod-eling of the subgrid scale and its influence leads to a modified coa...
Providing Engineering lab equipments at each and every corner of this world is not possible but i... more Providing Engineering lab equipments at each and every corner of this world is not possible but it is possible to provide a software! Virtual Lab technology adapts this concept and provides education to as much remote as possible locations. Virtual Lab is an Embedded Android Mobile Application that interfaces with the real physical lab equipments and makes it possible to conduct experiments from remote location. Virtual Lab is connected to main Lab from a Remote lab using Internet. It is also capable of connecting using Bluetooth, provided Virtual Lab application is running in a device which is near to Lab equipment. It takes input from the user and sends corresponding signals to the hardware using HTTP protocol. Students can perform their experiments on their Android device virtually and see the live result which is carried out in the main central lab using high quality video streaming. Experiments are preloaded in the application and new experiments can be loaded by updating the a...
Journal of Thermal Science and Engineering Applications, 2020
In the present work, a numerical model is developed to analyze the riser-downcomer system of a na... more In the present work, a numerical model is developed to analyze the riser-downcomer system of a natural circulation steam generator. The design and operation of the riser-downcomer system involve many complex issues such as multiphase flow inside the riser tubes, numerous possibilities of different flow regimes, and undesirable tube overheating due to the occurrence of critical heat flux (CHF). A separated flow model is developed to analyze steam-water two-phase flow inside the heated riser tubes. Further, the model is coupled with the implementation of the complex flow regime map and evaluation of wall temperature rise of the riser tubes. The present model is adequately validated with the existing experimental and numerical data as a direct problem. The model accuracy in predicting the tube dry-out and practical design is tested with the experimental data and real plant data, respectively. A typical 600 MW thermal power plant boiler is then investigated along with techno-economic ef...
Academic and business interest in sustainability and green practice has grown up considerably in ... more Academic and business interest in sustainability and green practice has grown up considerably in recent years. Entrepreneurial orientation and market orientation are the two most researched issues in the SME sector. Instead, the business has proven a direct and indirect effect on our mother nature, which is not in favour of the environment. Even the SME sector and environmental issues are very closely related to upcoming challenges and opportunities for Bangladesh. So depending on previous studies, this paper presented a way of the better environmental performance of the SME sector that is positively influenced by green entrepreneurial orientation. Side of that, this paper also focused on the mediating effect of green market orientation. The main purpose of this paper can divide into two categories. One is a details literature view on the topics, and another is a conceptual framework for this research field. This study provides insights and suggestions from previous researches for g...
Abstract In the present work, a natural circulation boiler of a typical 210 MW thermal power plan... more Abstract In the present work, a natural circulation boiler of a typical 210 MW thermal power plant is investigated with an objective to provide the feasible, reliable, and safe design solution of the riser-downcomer circuit. A thermo-geometric analysis of a riser-downcomer circuit of a typical subcritical boiler is carried out for a specified steam generation rate, based on a two-phase flow model. The developed model is validated with the available experimental/numerical data, satisfactorily. The model takes care of a detailed flow regime map, is capable of identifying DNB and CHF points, and can estimate a typical temperature rise of riser tubes under any flow regimes. The safe and unsafe zones of operations of heated riser tubes have been identified quantitatively and accordingly a range of feasible design solutions are demonstrated in a tabular form. The tube numbers, lengths, and especially the diameters and thicknesses are provided in compliance with the ASME boiler code. We would like to emphasize that the objective of this work is not to select a single design, rather provide a number of flexible solutions, which can be utilized by researchers, manufacturers, and practicing engineers, according to their needs.
Due to the construction of buildings and other infrastructures in the major cities in Bangladesh,... more Due to the construction of buildings and other infrastructures in the major cities in Bangladesh, it is found that the uncovered ground area for infiltration of rain water to ground water reservoir is reduced significantly. On the other hand, continuous sucking of ground water from underground reservoir results in depletion of ground water level year by year. This environmental problem can be reduced by application of porous concrete on parking areas, walkways, and roads for light vehicles, etc. With this background, this study on pervious concrete has been planned. Cylinder concrete specimens of diameter 100 mm and height 200 mm were made with locally available coarse aggregates(1st class brick aggregate, crushed stone aggregate, and recycled brick aggregate). Variables include type of aggregate and gradation of aggregate. Cement content was 300 kg/m3 and water-to-cement ratio was 0.33. Test items include void in aggregate, unit weight of aggregate, specific gravity of aggregate, compressive and tensile strength of pervious concrete at 28 days and permeability of water through the pervious concrete. The experimental results revealed that compressive strength as well as tensile strength of pervious concrete is inversely proportional to the permeability. Within the scope of this investigation, pervious concrete with compressive strength range from 650 to 1700 psi and permeability from 60 to 15 mm/sec can be made. The results clearly indicated that pervious concrete can be used on parking, walkways, and roads for light weight vehicles.
Due to its implicit invocation nature ofAspect Oriented Programming (AOP), locating a jointpoint ... more Due to its implicit invocation nature ofAspect Oriented Programming (AOP), locating a jointpoint for executing aspect is extremely difficult. Hence,it becomes difficult to understand the application’sflow and behavior. Current AOP visualization tools havelimitations such as high dependency on other tools,confusing and excessive use of color to represent aspectsand using an outdated version of AspectJ. In thispaper, we propose a new approach collapsibletabular visualization tool to visualize and represent AOPfeatures to aid the programmers in betterunderstanding AOP applications. We have come outof traditional color-based aspect visualization and developeda web based tool: AspectViz that visualizes the aspects ina simple collapsible table. A questionnaire containingfour different questions related to aspects visualizationwas developed to compare AspectViz with currentvisualization tools. 20 graduate students andprofessional software developers were invited to participatein the test e...
Proceeding of Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India, 2022
Proceeding of Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India, 2022
To my parents for their endless love and support A general description of a thermally coupled flu... more To my parents for their endless love and support A general description of a thermally coupled fluid flow is given by the incompressible Navier-Stokes equations coupled with the heat equation using Boussinesq approximation, whose mathematical structure is much well understood. A variational multiscale finite element approximation has been considered for the formulation of incompressible Navier-Stokes equation and heat equation. The complexity of these problems makes their numerical solution very difficult as the standard finite element method is unstable. In the incompressible Navier Stokes equations, two well known sources of numerical instabilities are the incompressibility constraint and the presence of the convective term. Many stabilization techniques used nowadays are based on scale separation, splitting the unknown into a coarse part induced by the discretization of the domain and a fine subgrid part. The mod-eling of the subgrid scale and its influence leads to a modified coa...
Providing Engineering lab equipments at each and every corner of this world is not possible but i... more Providing Engineering lab equipments at each and every corner of this world is not possible but it is possible to provide a software! Virtual Lab technology adapts this concept and provides education to as much remote as possible locations. Virtual Lab is an Embedded Android Mobile Application that interfaces with the real physical lab equipments and makes it possible to conduct experiments from remote location. Virtual Lab is connected to main Lab from a Remote lab using Internet. It is also capable of connecting using Bluetooth, provided Virtual Lab application is running in a device which is near to Lab equipment. It takes input from the user and sends corresponding signals to the hardware using HTTP protocol. Students can perform their experiments on their Android device virtually and see the live result which is carried out in the main central lab using high quality video streaming. Experiments are preloaded in the application and new experiments can be loaded by updating the a...
Journal of Thermal Science and Engineering Applications, 2020
In the present work, a numerical model is developed to analyze the riser-downcomer system of a na... more In the present work, a numerical model is developed to analyze the riser-downcomer system of a natural circulation steam generator. The design and operation of the riser-downcomer system involve many complex issues such as multiphase flow inside the riser tubes, numerous possibilities of different flow regimes, and undesirable tube overheating due to the occurrence of critical heat flux (CHF). A separated flow model is developed to analyze steam-water two-phase flow inside the heated riser tubes. Further, the model is coupled with the implementation of the complex flow regime map and evaluation of wall temperature rise of the riser tubes. The present model is adequately validated with the existing experimental and numerical data as a direct problem. The model accuracy in predicting the tube dry-out and practical design is tested with the experimental data and real plant data, respectively. A typical 600 MW thermal power plant boiler is then investigated along with techno-economic ef...
Academic and business interest in sustainability and green practice has grown up considerably in ... more Academic and business interest in sustainability and green practice has grown up considerably in recent years. Entrepreneurial orientation and market orientation are the two most researched issues in the SME sector. Instead, the business has proven a direct and indirect effect on our mother nature, which is not in favour of the environment. Even the SME sector and environmental issues are very closely related to upcoming challenges and opportunities for Bangladesh. So depending on previous studies, this paper presented a way of the better environmental performance of the SME sector that is positively influenced by green entrepreneurial orientation. Side of that, this paper also focused on the mediating effect of green market orientation. The main purpose of this paper can divide into two categories. One is a details literature view on the topics, and another is a conceptual framework for this research field. This study provides insights and suggestions from previous researches for g...
Abstract In the present work, a natural circulation boiler of a typical 210 MW thermal power plan... more Abstract In the present work, a natural circulation boiler of a typical 210 MW thermal power plant is investigated with an objective to provide the feasible, reliable, and safe design solution of the riser-downcomer circuit. A thermo-geometric analysis of a riser-downcomer circuit of a typical subcritical boiler is carried out for a specified steam generation rate, based on a two-phase flow model. The developed model is validated with the available experimental/numerical data, satisfactorily. The model takes care of a detailed flow regime map, is capable of identifying DNB and CHF points, and can estimate a typical temperature rise of riser tubes under any flow regimes. The safe and unsafe zones of operations of heated riser tubes have been identified quantitatively and accordingly a range of feasible design solutions are demonstrated in a tabular form. The tube numbers, lengths, and especially the diameters and thicknesses are provided in compliance with the ASME boiler code. We would like to emphasize that the objective of this work is not to select a single design, rather provide a number of flexible solutions, which can be utilized by researchers, manufacturers, and practicing engineers, according to their needs.
Due to the construction of buildings and other infrastructures in the major cities in Bangladesh,... more Due to the construction of buildings and other infrastructures in the major cities in Bangladesh, it is found that the uncovered ground area for infiltration of rain water to ground water reservoir is reduced significantly. On the other hand, continuous sucking of ground water from underground reservoir results in depletion of ground water level year by year. This environmental problem can be reduced by application of porous concrete on parking areas, walkways, and roads for light vehicles, etc. With this background, this study on pervious concrete has been planned. Cylinder concrete specimens of diameter 100 mm and height 200 mm were made with locally available coarse aggregates(1st class brick aggregate, crushed stone aggregate, and recycled brick aggregate). Variables include type of aggregate and gradation of aggregate. Cement content was 300 kg/m3 and water-to-cement ratio was 0.33. Test items include void in aggregate, unit weight of aggregate, specific gravity of aggregate, compressive and tensile strength of pervious concrete at 28 days and permeability of water through the pervious concrete. The experimental results revealed that compressive strength as well as tensile strength of pervious concrete is inversely proportional to the permeability. Within the scope of this investigation, pervious concrete with compressive strength range from 650 to 1700 psi and permeability from 60 to 15 mm/sec can be made. The results clearly indicated that pervious concrete can be used on parking, walkways, and roads for light weight vehicles.
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