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Papers by manoj kumar Triveni

Research paper thumbnail of Effects of Variant Positions of Cold Walls on Narural Convection in a Triangular Cavitiy

Journal of Applied Fluid Mechanics, 2016

The effect of different configurations of partial cold walls on laminar natural convection heat t... more The effect of different configurations of partial cold walls on laminar natural convection heat transfer for a right-angle triangular cavity heated from below has been studied numerically. The enclosure is filled with water and heat transfer surfaces such as hot and cold walls are maintained at constant temperature. The side and hypotenuse walls of the enclosure are detached from the middle and have been arranged in four different configurations, namely AB, BC, AD and CD for cooling purpose. The finite volume method is used to solve the dimensionless governing mass, momentum and energy equations. The problem has been solved to explore the effects of the pertinent parameters i.e. different configurations of cold walls and variation of Rayleigh number (10 5 ≤ Ra ≤ 10 7). Results are obtained from numerical simulation using commercial software package, FLUENT and presented in the form of streamlines and isotherms. The thermal performance of the enclosure has been expressed by local and average Nusselt numbers. From the analysis, it is observed that the temperature distribution and flow field are significantly affected by these parameters. The high heat transfer rate has been observed for the position AB while low for the position CD. Also, the heat transfer rate enhances as the Rayleigh number (Ra) increases.

Research paper thumbnail of Convective Heat Transfer Analysis in an Arch Enclosure

Frontiers in Heat and Mass Transfer, 2015

A numerical investigation through laminar natural convection has been executed to illuminate the ... more A numerical investigation through laminar natural convection has been executed to illuminate the effect of curvature ratio in an arch enclosure filled with water. The left side wall of the cavity is maintained at a higher temperature than that of the right side wall while the other walls are kept insulated. The governing equations such as continuity, momentum and energy equation are solved by finite volume method. The effect of pertinent parameters such as curvature ratio (1≤ CR ≤ 1.5) and Rayleigh number (1×10 4 ≤ Ra ≤ 1×10 6) and) on heat transfer are calculated by commercial available computational fluid dynamics software, FLUENT 6.3. The fluid flow and heat transfer are shown for fixed Pandtl number 6.5 by streamlines, isotherms and velocity contour. From the investigation, it has been reported that the varying height of the arch cavity and Rayleigh number playing a significant role in heat transfer rate. The variation in heat transfer is calculated in terms of average Nusselt number.

Research paper thumbnail of Numerical Analysis of Natural Convection in a Right-Angle Triangular Enclosure

Frontiers in Heat and Mass Transfer, 2014

A numerical investigation has been performed for heat transfer analysis in a right-angled triangu... more A numerical investigation has been performed for heat transfer analysis in a right-angled triangular enclosure filled with water. The side wall of the enclosure is maintained at high temperature compare to the base wall while hypotenuse is kept thermally insulated. Two-dimensional steady-state continuity, momentum and energy equations along with the boussinesq approximation are solved by finite volume method using commercial available software, FLUENT 6.3. The computational results are shown in terms of isotherms, streamlines and velocity contour for Rayleigh number (10 5 ≤ Ra ≤ 10 7). The heat transfer is presented in terms of local and average Nusselt number. The result encapsulates that both flow field and temperature distributions are affected with Rayleigh number. The simulated results are validated with the experimental and numerical results and it shows a good agreement with the published results. Finally, a correlation for Nusselt number (Nu) with Rayleigh number (Ra) has been developed for vertical hot wall.

Research paper thumbnail of Laminar Natural Convection for Thermally Active Partial Side Walls in a Right-Angled Triangular Cavity

Arabian Journal for Science and Engineering, 2014

The effect of partial heating and cooling on laminar natural convective heat transfer in right-an... more The effect of partial heating and cooling on laminar natural convective heat transfer in right-angle triangular cavity filled with water has been investigated numerically. The triangular cavity is presented in nine different configurations namely Left-Bottom, Left-Middle, Left-Top, Middle-Bottom, Middle-Middle, Middle-Top, Right-Bottom, Right-Middle and Right-Top and the length of the thermally active wall is b = L/3. The base wall is considered as partially hot while the side wall as partially cold. Two-dimensional steadystate continuity, Navier-Stokes and energy equations along with the Boussinesq approximation are solved using the finite volume method. The Rayleigh number is varied from 10 5 to 10 7. Results revealed that the heat transfer rate is high for LB walls whereas low for RT location. Also, the heat transfer rate enhancement is observed for all values of Rayleigh number.

Research paper thumbnail of NUMERICAL ANALYSIS OF NATURAL CONVECTION IN A RIGHT- ANGLED TRIANGULAR ENCLOSURE

A numerical investigation has been performed for heat transfer analysis in a right-angled triangu... more A numerical investigation has been performed for heat transfer analysis in a right-angled triangular enclosure filled with water. The side wall of the enclosure is maintained at high temperature compare to the base wall while hypotenuse is kept thermally insulated. Two-dimensional steady-state continuity, momentum and energy equations along with the boussinesq approximation are solved by finite volume method using commercial available software, FLUENT 6.3. The computational results are shown in terms of isotherms, streamlines and velocity contour for Rayleigh number (10 5 ≤ Ra ≤ 10 7). The heat transfer is presented in terms of local and average Nusselt number. The result encapsulates that both flow field and temperature distributions are affected with Rayleigh number. The simulated results are validated with the experimental and numerical results and it shows a good agreement with the published results. Finally, a correlation for Nusselt number (Nu) with Rayleigh number (Ra) has been developed for vertical hot wall.

Research paper thumbnail of Effects of Variant Positions of Cold Walls on Narural Convection in a Triangular Cavitiy

Journal of Applied Fluid Mechanics, 2016

The effect of different configurations of partial cold walls on laminar natural convection heat t... more The effect of different configurations of partial cold walls on laminar natural convection heat transfer for a right-angle triangular cavity heated from below has been studied numerically. The enclosure is filled with water and heat transfer surfaces such as hot and cold walls are maintained at constant temperature. The side and hypotenuse walls of the enclosure are detached from the middle and have been arranged in four different configurations, namely AB, BC, AD and CD for cooling purpose. The finite volume method is used to solve the dimensionless governing mass, momentum and energy equations. The problem has been solved to explore the effects of the pertinent parameters i.e. different configurations of cold walls and variation of Rayleigh number (10 5 ≤ Ra ≤ 10 7). Results are obtained from numerical simulation using commercial software package, FLUENT and presented in the form of streamlines and isotherms. The thermal performance of the enclosure has been expressed by local and average Nusselt numbers. From the analysis, it is observed that the temperature distribution and flow field are significantly affected by these parameters. The high heat transfer rate has been observed for the position AB while low for the position CD. Also, the heat transfer rate enhances as the Rayleigh number (Ra) increases.

Research paper thumbnail of Convective Heat Transfer Analysis in an Arch Enclosure

Frontiers in Heat and Mass Transfer, 2015

A numerical investigation through laminar natural convection has been executed to illuminate the ... more A numerical investigation through laminar natural convection has been executed to illuminate the effect of curvature ratio in an arch enclosure filled with water. The left side wall of the cavity is maintained at a higher temperature than that of the right side wall while the other walls are kept insulated. The governing equations such as continuity, momentum and energy equation are solved by finite volume method. The effect of pertinent parameters such as curvature ratio (1≤ CR ≤ 1.5) and Rayleigh number (1×10 4 ≤ Ra ≤ 1×10 6) and) on heat transfer are calculated by commercial available computational fluid dynamics software, FLUENT 6.3. The fluid flow and heat transfer are shown for fixed Pandtl number 6.5 by streamlines, isotherms and velocity contour. From the investigation, it has been reported that the varying height of the arch cavity and Rayleigh number playing a significant role in heat transfer rate. The variation in heat transfer is calculated in terms of average Nusselt number.

Research paper thumbnail of Numerical Analysis of Natural Convection in a Right-Angle Triangular Enclosure

Frontiers in Heat and Mass Transfer, 2014

A numerical investigation has been performed for heat transfer analysis in a right-angled triangu... more A numerical investigation has been performed for heat transfer analysis in a right-angled triangular enclosure filled with water. The side wall of the enclosure is maintained at high temperature compare to the base wall while hypotenuse is kept thermally insulated. Two-dimensional steady-state continuity, momentum and energy equations along with the boussinesq approximation are solved by finite volume method using commercial available software, FLUENT 6.3. The computational results are shown in terms of isotherms, streamlines and velocity contour for Rayleigh number (10 5 ≤ Ra ≤ 10 7). The heat transfer is presented in terms of local and average Nusselt number. The result encapsulates that both flow field and temperature distributions are affected with Rayleigh number. The simulated results are validated with the experimental and numerical results and it shows a good agreement with the published results. Finally, a correlation for Nusselt number (Nu) with Rayleigh number (Ra) has been developed for vertical hot wall.

Research paper thumbnail of Laminar Natural Convection for Thermally Active Partial Side Walls in a Right-Angled Triangular Cavity

Arabian Journal for Science and Engineering, 2014

The effect of partial heating and cooling on laminar natural convective heat transfer in right-an... more The effect of partial heating and cooling on laminar natural convective heat transfer in right-angle triangular cavity filled with water has been investigated numerically. The triangular cavity is presented in nine different configurations namely Left-Bottom, Left-Middle, Left-Top, Middle-Bottom, Middle-Middle, Middle-Top, Right-Bottom, Right-Middle and Right-Top and the length of the thermally active wall is b = L/3. The base wall is considered as partially hot while the side wall as partially cold. Two-dimensional steadystate continuity, Navier-Stokes and energy equations along with the Boussinesq approximation are solved using the finite volume method. The Rayleigh number is varied from 10 5 to 10 7. Results revealed that the heat transfer rate is high for LB walls whereas low for RT location. Also, the heat transfer rate enhancement is observed for all values of Rayleigh number.

Research paper thumbnail of NUMERICAL ANALYSIS OF NATURAL CONVECTION IN A RIGHT- ANGLED TRIANGULAR ENCLOSURE

A numerical investigation has been performed for heat transfer analysis in a right-angled triangu... more A numerical investigation has been performed for heat transfer analysis in a right-angled triangular enclosure filled with water. The side wall of the enclosure is maintained at high temperature compare to the base wall while hypotenuse is kept thermally insulated. Two-dimensional steady-state continuity, momentum and energy equations along with the boussinesq approximation are solved by finite volume method using commercial available software, FLUENT 6.3. The computational results are shown in terms of isotherms, streamlines and velocity contour for Rayleigh number (10 5 ≤ Ra ≤ 10 7). The heat transfer is presented in terms of local and average Nusselt number. The result encapsulates that both flow field and temperature distributions are affected with Rayleigh number. The simulated results are validated with the experimental and numerical results and it shows a good agreement with the published results. Finally, a correlation for Nusselt number (Nu) with Rayleigh number (Ra) has been developed for vertical hot wall.