Influence of heat flux and Reynolds number on the entropy generation for different types of nanofluids in a hexagon microchannel heat sink

Alfaryjat, Altayyeb; Dobrovicescu, Alexandru; Stanciu, Dorin

doi:10.1016/j.cjche.2018.08.009

Cited by 39 publications

(8 citation statements)

References 39 publications

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“…The FF EGR had a maximum decrease for Cu-water and Cu-ethylene glycol that was 38% and 35% respectively at the highest used φ value in this study. Alfaryjat et al (2019) studied EG for laminar forced convection NF flow in hexagonal MCHS using the second law of thermodynamics. The investigation was carried out using NFs containing the NPs of Al 2 O 3 , CuO and SiO 2 with water as the base fluid.…”

Section: Eg In Mcs With Nanofluidsmentioning

confidence: 99%

Entropy generation analysis due to heat transfer and nanofluid flow through microchannels: a review

Kumar

Bharj

2020

IJEX

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This work presents a detailed review of the entropy generation due to the heat transfer and the fluid flow through different channels. The earlier contribution of the researchers in the form of theoretical, numerical and experimental studies on the entropy generation in the conventional or microchannels, with or without disruption in the flow and with or without the use of nanofluids is reviewed. The brief discussion on the microchannels, disrupted microchannels, nanofluids and entropy generation is presented. Studies performed on the channel cross-sectional shapes and rib shapes for thermal performance optimisation are discussed in the paper. Nanoparticles such as Al2O3, Cu, CuO, Ag, SiO2, etc. have been used for preparing the nanofluids along with water, ethylene glycol, etc. as base fluids. Additionally, the effect of disruption in flow field on the entropy generation is also discussed. The disruptions in the form of ribs, cavities, vortex generators, etc. have been taken into account. It is hoped that this review article can provide a basis for further research on the irreversibility analysis of the nanofluid flowing through disrupted microchannels to improve the hydrodynamic and thermal performance of the system.

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Section: Eg In Mcs With Nanofluidsmentioning

confidence: 99%

Entropy generation analysis due to heat transfer and nanofluid flow through microchannels: a review

Kumar

Bharj

2020

IJEX

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“…Another study by Rastogi and Mahulikar [28] concluded that the optimum dimension of the channel occurs corresponding to the minimum S gen,total . The increase in the volume fraction of the nanoparticle results in S gen,Fr increment [25,29]. Hosseini and Sheikholeslami [30] concluded that increment in the AR from 1 to 7.5 for the microchannel resulted in an upward trend of the dimensionless total N S .…”

Section: Introductionmentioning

confidence: 99%

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Kumar

Bharj

2020

Journal of Non-Equilibrium Thermodynamics

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The performance of the microchannel heat sink (MCHS) in electronic applications needs to be optimized corresponding to the number of channels (N). In this study optimization of the number of channels corresponding to the diameter of the microchannel ({D_{N}}) using an entropy generation minimization approach is achieved for the MCHS used in electronic applications. The numerical study is performed for constant total heat flow rate ({\dot{q}_{tot}}) and total mass flow rate ({\dot{m}_{tot}}). The results indicate that the dominance of frictional entropy generation ({S_{gen,Fr}}) increases with the reduction in diameter. However, the entropy generation due to heat transfer ({S_{gen,HT}}) decreases with the reduction in diameter. Therefore, the optimum diameter ({D^{\ast }}) is calculated corresponding to the minimum total entropy generation ({S_{gen,total}}) for the optimum number of channels ({N^{\ast }}). Furthermore, the entropy generation number ({N_{S}}) and Bejan number (Be) are also calculated.

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“…The results showed that the thermal resistance, temperature rise, and hot zone temperature change of the transverse flow microchannel heat sink are the smallest in the specified flow range, and the counterflow radiator has the lowest pressure drop. Alfaryjat et al 31 investigated the entropy production of different nanofluids in hexagonal microchannels. The results showed that the total entropy production of nanofluids is smaller than that of water at lower Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Flow and heat transfer characteristics of a fractal microchannel heat sink with three‐dimensional fractal tail

Tang

Sun

et al. 2022

Asia-Pacific J Chem Eng

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In order to solve the problem of weak heat transfer capacity on the peripheral part of the disk‐shaped fractal microchannel heat sink (FMHS), different from the traditional plane fractal, a higher‐order fractal was carried out at the end of the fractal microchannel, and the end of the microchannel was transformed into a three‐dimensional fractal to strengthen the heat transfer in the peripheral part of the FMHS. Different forms of bionic FMHSs were established based on the fractal number and fractal topology at the tail, and the flow and heat transfer characteristics of different fractals were studied. The results showed that with the increase of fractal number, the pressure drop is increased by 5.96–8.29%, the heat transfer effect is enhanced, the surface temperature of the FMHS gradually decreases, and the temperature uniformity is improved. For each topological relationship and fractal number, the heat transfer capacity of the four fractals microchannel with B‐type topological relationship is the strongest, and the comprehensive performance index can reach 1.29 (Re = 200).

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Influence of heat flux and Reynolds number on the entropy generation for different types of nanofluids in a hexagon microchannel heat sink

Cited by 39 publications

References 39 publications

Entropy generation analysis due to heat transfer and nanofluid flow through microchannels: a review

Entropy generation analysis due to heat transfer and nanofluid flow through microchannels: a review

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Flow and heat transfer characteristics of a fractal microchannel heat sink with three‐dimensional fractal tail

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