Entropy generation in rectangular microchannels

Kuddusi, Lütfullah

doi:10.1504/ijex.2016.074263

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Among the three channel shapes, square-shaped MCHS showed the lowest TEG for all Re and HFs. Kuddusi (2016) used two different thermal versions, uniform temperature and uniform HF on the walls to study the EG in the air flow through the rectangular MC. The EG calculations were made corresponding to the analytical expressions of the velocity and temperature profiles.…”

Section: Eg In Mcsmentioning

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 Mcsmentioning

confidence: 99%

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

Kumar

Bharj

2020

IJEX

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“…Ebrahimi et al [21] analyzed increment in S gen,Fr for the case of nanofluid flow as a result of higher fluid viscosity at higher Reynold number (Re) due to lower bulk temperature of the coolant. The increase or decrease in the irreversibility is dependent on the value of Kn under uniform wall heat flux BC corresponding to an increase or decrease in the channel AR [22]. Cruz-Duarte et al [23] found the use of nanofluid in the laminar flow environment helpful in minimizing the entropy production of the system under the condition when the volume flow rate was considered as a design variable.…”

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 studies in the micro-channel with slip flow and temperature jumps have been carried out by most of the researches [22][23][24][25][26][27][28][29], and they carried out useful findings. Hooman [30] performed entropy analysis under various boundary conditions through duct geometry and used a numerical technique.…”

Section: Introductionmentioning

confidence: 99%

Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts

2020

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Original scientific paper https://doi.org/10.2298/TSCI181115029GIn this study, the influence of slip flow and temperature jump on the entropy generation rate are investigated in rectangular microducts. The Knudsen numbers are considered in the range between 0.001 and 0.1, and the aspect ratio lies between 0 and 1. The dimensionless governing equations are solved numerically using Chebyshev spectral collocation method, and the dimensionless velocity and temperature gradients are employed in the entropy generation model. The influences of the dimensionless numbers including Bejan number and irreversibility distribution ratio on the entropy generation rates are investigated and discussed through surface plots and contour diagrams. It is demonstrated that the minimum entropy generation rate exists corresponding to an optimal aspect ratio for each dimensionless number. This minimum entropy generation rate depends upon the nature of dimensionless numbers.

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Entropy generation in rectangular microchannels

Cited by 8 publications

References 19 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

Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts

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