Effect of surface radiation heat transfer on the optimal distribution of discrete heat sources under natural convection

Hotta, Tapano Kumar; Muvvala, Pullarao; Venkateshan, S. P.

doi:10.1007/s00231-012-1072-0

Cited by 17 publications

(9 citation statements)

References 18 publications

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“…The obtained results have shown that an interaction effect of surface radiation with laminar natural convection increases with increasing surface emissivity of both heat generating element and adiabatic side plates while the emissivity of the heat source weakens the convective heat transfer but the emissivity of adiabatic plates strengthens the same. Hotta et al [8] have conducted experimental analysis to study the effect of surface radiation on natural convection from protruding discrete heat sources mounted at different positions on a substrate. It has been found that the maximum and minimum temperature excess decreases by increasing the value of a dimensionless geometric distance parameter and the highest heat generating element should be placed at the bottom corner on the substrate board.…”

Section: Introductionmentioning

confidence: 99%

Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Martyushev

Sheremet

2014

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 99%

Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Martyushev

Sheremet

2014

International Journal of Thermal Sciences

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“…The X is a heuristic parameter and is validated both experimentally and numerically for its range of values specified. The numerical vali dation of this parameter was carried out by Sudhkar et al [7], and furthermore additional experiments were conducted by the authors in their previous work [10], using the same parameter, under natu ral convection with identical and nonidentical size discrete heat sources. They found that the results hold good for these cases as well.…”

Section: Resultsmentioning

confidence: 99%

“…The data logger model is 34970 A, manufac tured by Agilent technologies limited, which can display, and store the data recorded by thermocouples. More details of the ex perimental set up along with the schematic diagram of heat source design, and experimental set up is given in Hotta et al [10]. The procedure for conducting the experiments is detailed below.…”

Section: Methodsmentioning

confidence: 99%

Optimal Distribution of Discrete Heat Sources Under Mixed Convection—A Heuristic Approach

Hotta

Balaji

Venkateshan

2014

Journal of Heat Transfer

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Steady state experiments are conducted in a low speed horizontal wind tunnel under mixed convection for five discrete heat sources (aluminum) o f nonidentical sizes arranged at different positions on a substrate board (bakelife) to determine the optimal configura tion. The optimal configuration is one for which the maximum tem perature excess (difference between the maximum temperature among the heat sources o f that configuration, and the ambient tem perature) is the lowest among all the other possible configurations and is determined by a heuristic nondimensional geometric param eter X. The maximum temperature excess is found to decrease with X, signifying an increase in heat transfer coefficient. In view of this, the configuration with highest X is deemed to be the optimal one. The effect o f surface radiation on the heat transfer character istic o f heat sources is also studied by painting their surface with black, which reduces their temperature by as much as 12%. An empirical correlation is developed for the nondimensional maxi mum temperature excess (9) in terms o f X, by taking into account the effect of surface radiation. The correlation when applied for highest X of the configuration returns the minimum value of 9 at the optimal condition, which is a key engineering quantity that is sought in problems of this class.

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“…Experimental studies for the cooling of protruding discrete heat sources mounted at different positions on a substrate board using air as the working medium was carried out by Hotta et al [6]. The study confirms the effect of surface radiation, which reduces the temperature of electronic components by as much as 12%.…”

Section: Background Studymentioning

confidence: 90%

“…It has been confirmed from the literature that most of the studies [6,10,11,13,14] are pertinent to the use of single working fluid under single mode of heat transfer for the cooling of discrete heated modules. Some of the researchers [7-9, 12, 15, 16] have also focused on the use of two working fluids.…”

Section: Background Studymentioning

confidence: 99%

Role of working fluids on the cooling of discrete heated modules: a numerical approach

Patil

Hotta

2018

Sādhanā

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The study has focused on the role of working fluids (air, water and FC-72) on the cooling of discrete heated modules under free, forced and mixed convection medium. Three non-identical protruding discrete heat sources are arranged at different positions on a substrate board following golden mean ratio (GMR). Numerical simulations for these heat sources are carried out using a commercial software (ANSYS-Icepak R-15) to simulate their flow and temperature fields under three different modes of heat transfer. Results suggest that the temperature of the heat sources is a strong function of their size, position on the substrate board, the velocity of the fluid and type of working fluid used. A correlation has been proposed for the temperature of these heat sources keeping in mind their strong dependence on the afore-mentioned parameters. It has been found that water can be used for better heat removal from the heat sources due to its high boiling point. The whole idea gives a clear insight to the electronic cooling engineers regarding the selection of working fluids and modes of heat transfer for the cooling of electronic components.

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Effect of surface radiation heat transfer on the optimal distribution of discrete heat sources under natural convection

Cited by 17 publications

References 18 publications

Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Optimal Distribution of Discrete Heat Sources Under Mixed Convection—A Heuristic Approach

Role of working fluids on the cooling of discrete heated modules: a numerical approach

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