Effects of Thermal Boundary Conditions on Entropy Generation during Natural Convection

Basak, Tanmay; Kaluri, Ram Satish; Balakrishnan, A.

doi:10.1080/10407782.2011.549075

Cited by 64 publications

(24 citation statements)

References 24 publications

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“…Among the previous works [21][22][23][24][25][26][27][28], Table 1 summarizes some studies that have treated the case of a vertical cavity with adiabatic top wall, while the bottom and vertical walls are at various thermal boundary conditions (uniform (hot (T h ) or cold (T c )), linear, or sinusoidal temperature profiles). Globally, the purpose of these studies is to investigate the effect of different combinations of thermal boundary conditions and Rayleigh and Prandtl numbers on the structure of the flow and heat transfer within a square [22][23][24][25]28] or rectangular cavity with A 4 [26,27].…”

Section: Introductionmentioning

confidence: 99%

Multicellular Convection Flow and Heat Transfer in a Tall Vertical Cavity with a Linear Temperature Profile on Both Sidewalls

Moutaouakil

Zrikem

Abdelbaki

2014

Numerical Heat Transfer, Part A: Applications

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CNRST-URAC 27), Marrakech, MoroccoLaminar natural convection of air in a vertical cavity, of aspect ratio A ¼ 40 with linear temperature profiles on both sidewalls, is studied. Two new situations are explored, both temperature profiles have the same (case I) or opposite (case II) slopes c, and their averages are at the mid-height of sidewalls. The effect of the Rayleigh numbers Ra m at the mid-height and the slopes on the multicellular flow and heat transfer is investigated. Depending on the values of c and Ra m , the results may be quite different from those of the classical case corresponding to a zero slope. Two precise correlations which give the average heat transfer as a function of c and Ra m are also developed for both cases.

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Section: Introductionmentioning

confidence: 99%

Multicellular Convection Flow and Heat Transfer in a Tall Vertical Cavity with a Linear Temperature Profile on Both Sidewalls

Moutaouakil

Zrikem

Abdelbaki

2014

Numerical Heat Transfer, Part A: Applications

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“…The researches Basak et al (2011) Morsli and Sabeur-Bendehina (2014), Nejad (2017), Shi et al (2017), Yehya and Naji (2015) and Erbay et al (2003), studied entropy generation in square enclosures with different cases. Basak et al (2011) presented a square cavity subjected to linearly cool from the sides and hot isothermal bottom while the top assumed fully insulated to reach a minimum entropy generation. It was found that the heat transfer irreversibility dominated the entropy generation in the cavity with low Ra value, while the maximum entropy generation due to * Corresponding Author.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis of a Natural Convection Inside a Sinusoidal Enclosure With Different Shapes of Cylinders

Ali¹,

Jassim²,

Al-Amir³

et al. 2019

Frontiers in Heat and Mass Transfer

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This study is focused on the entropy generation of laminar natural convection inside a sinusoidal enclosure filled with air (Pr=0.71). The numerical investigation is performed for three shapes of inner cylinders (circle, square, and equilateral triangle) with the same area and different values of the Rayleigh number (10 3 -10 6 ). Galerkin Finite Element Approach is utilized to solve the governing equations. The results showed that the entropy generations due to heat transfer, fluid friction and total entropy generation increase with increasing values of Rayleigh number, while the local Bejan number decreases.

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“…Often, a non-dimensional parameter called Bejan number is introduced to show the relative contribution of each effect. The analyses on the topic of single phase convective fluid flow and heat transfer applications were carried out by several authors [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Entropy Generation during the Convective Quenching of a Cluster of Balls

Mahapatra

Manna

Ghosh

2014

Numerical Heat Transfer, Part A: Applications

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An entropy generation analysis is carried out for convective quenching of cluster of hot balls in a pool of three common quenchants (molten salt, water and oil). The formulation is based on the conservation principle in Eulerian framework following a two-fluid approach and clearly indicates the contribution due to thermal irreversibility as a result of finite temperature gradient and that due to viscous effect arising out of drag. The time averaged normalized entropy generation is used to find the most suitable injection velocity in the quenching process for molten salt. The quenching process is optimized by using the entropy generation parameter.

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Effects of Thermal Boundary Conditions on Entropy Generation during Natural Convection

Cited by 64 publications

References 24 publications

Multicellular Convection Flow and Heat Transfer in a Tall Vertical Cavity with a Linear Temperature Profile on Both Sidewalls

Multicellular Convection Flow and Heat Transfer in a Tall Vertical Cavity with a Linear Temperature Profile on Both Sidewalls

Entropy Generation Analysis of a Natural Convection Inside a Sinusoidal Enclosure With Different Shapes of Cylinders

Analysis of Entropy Generation during the Convective Quenching of a Cluster of Balls

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