Heat Transfer Enhancement and Entropy Generation in a Square Enclosure in the Presence of Adiabatic and Isothermal Blocks

Mahapatra, Pallab Sinha; De, Somnath; Ghosh, Koushik; Manna, Nirmal K.; Mukhopadhyay, Achintya

doi:10.1080/10407782.2013.784679

Cited by 71 publications

(26 citation statements)

References 22 publications

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“…Hence, for the present problem time step and grid size were selected as 10 −3 and 100 × 100, respectively. For natural convection, the code was validated against the benchmark results by Davis (1983) whose details are presented elsewhere by Mahapatra et al (2013). The code agrees with the benchmark results for stream function and Nusselt number with maximum error of 3.8 and 0.5%, respectively.…”

Section: Nusselt Numbermentioning

confidence: 84%

Mixed convection in a baffled grooved channel

Sharma

Mahapatra

Manna

et al. 2015

Sadhana

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In the present numerical work, flow structure and heat transfer characteristics are investigated in a baffled grooved channel, differentially heated from the sides. The baffle is placed vertically downward from the top wall of grooved channel geometry, with the motive of diverting outside forced flow towards the inside of the square cavity. In-house CFD code based on finite volume method has been used to solve the 2D equations of continuity, momentum and energy. The effect of change in baffle position and height is investigated in the range of Richardson numbers 0.1 to 10. For the present study, external flow from both left and right of the grooved channel are considered. A remarkable enhancement of heat transfer is observed in presence of baffle. The study has also pointed out that for optimal performance, the position and height of the baffle need to be adjusted depending on the direction of external flow.

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Section: Nusselt Numbermentioning

confidence: 84%

Mixed convection in a baffled grooved channel

Sharma

Mahapatra

Manna

et al. 2015

Sadhana

Self Cite

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“…A fair number of studies on entropy generation during natural convection process in closed cavities filled with fluid and porous medium were carried out in last few years [20][21][22][23][24][25][26][27][28][29][30][31]. Mahapatra et al [20] studied entropy generation analysis in a square enclosure filled with air in presence of adiabatic and isothermal blocks.…”

Section: Introductionmentioning

confidence: 99%

“…Mahapatra et al [20] studied entropy generation analysis in a square enclosure filled with air in presence of adiabatic and isothermal blocks. Numerical study on entropy generation in a tilted square cavity for isothermally and non-isothermally heated bottom wall was carried out by Singh et al [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Entropy Generation During Mixed Convection in Porous Square Cavities: Effect of Thermal Boundary Conditions

Roy

Basak

Roy

2015

Numerical Heat Transfer, Part A: Applications

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Computational studies on entropy generation during laminar mixed convection in porous square enclosures have been carried out based on Darcy-Brinkman-Forchheimer model using the penalty finite element method. Finite element simulations are performed for the isothermally hot bottom wall, adiabatic top wall, and isothermally cold side walls (case 1) or linearly heated side walls (case 2) or linearly heated left wall with isothermally cold right wall (case 3) for a wide range of modified Darcy numbers (10 À5 Da m 10 À2 ), Grashof numbers (Gr ¼ 10 3 À 10 5 ), and modified Prandtl numbers (Pr m ¼ 0.026 and 7.2). Further, the effects of Da m on the total entropy generation (S total ), average Bejan number (Be av ), and average Nusselt number ðNu b Þ are discussed. It is found that Re ¼ 100 is preferred over Re ¼ 1 based on larger heat transfer rate with minimum entropy generation for Pr m ¼ 0.026 and 7.2, 10 À5 Da m 10 À2 at Gr ¼ 10 5 for all the cases.

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“…Mahapatra et al [29] employed the technique of finite volume to numerically determine entropy and CHT in a square cavity that had isothermal and adiabatic blocks. As a result, critical block sizes and low Rayleigh numbers improved the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Effects of Non-Homogeneous Nanofluid Model on Natural Convection in a Square Cavity in the Presence of Conducting Solid Block and Corner Heater

et al. 2018

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This study investigates numerically the effect of the two-phase nanofluid model due to natural convection within a square cavity along with the existence of a conducting solid block, and a corner heater using the finite difference method (FDM). The top horizontal wall is retained at a cold temperature that is fixed as constant, while the isothermal heater is positioned at the bottom left corner within the square cavity. The remaining fractions of the right vertical wall and the heated wall are set to be adiabatic. The water-based nanofluid, together with Al 2 O 3 nanoparticles, have been evaluated by determining the following parameters: the volume fraction of nanoparticles, thickness of solid block, Rayleigh number, and the solid block thermal conductivity. As a result, the comparative evaluation with outputs reported in publications and prior experimental works has pointed out exceptional agreement with the findings retrieved in this study. The experimental outcomes are graphically illustrated in terms of the average and local Nusselt numbers, isotherms, distribution of nanoparticles, and the streamlines. The findings indicate that an elevation of the thermal conductivity in blocks with a similar size successfully increases the transfer rate of heat, wherein the dominance of conduction has been observed.

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Heat Transfer Enhancement and Entropy Generation in a Square Enclosure in the Presence of Adiabatic and Isothermal Blocks

Cited by 71 publications

References 22 publications

Mixed convection in a baffled grooved channel

Mixed convection in a baffled grooved channel

Analysis of Entropy Generation During Mixed Convection in Porous Square Cavities: Effect of Thermal Boundary Conditions

Effects of Non-Homogeneous Nanofluid Model on Natural Convection in a Square Cavity in the Presence of Conducting Solid Block and Corner Heater

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