Entropy Generation Due to Laminar Incompressible Forced Convection Flow Through Parallel-Plates Microchannel

Haddad, O. M.; Abuzaid, M. M.; Al‐Nimr, M. A.

doi:10.3390/e6050413

Cited by 74 publications

(39 citation statements)

References 13 publications

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“…Similar to the case of Newtonian fluid (Hung, 2009), the findings of this work show that for non-Newtonian fluid also under certain conditions the viscous dissipation effect on entropy generation in microtubes is significant and should not be neglected. Haddad et al (2004) investigated entropy generation due to steady laminar forced convection fluid flow through parallel plates microchannel. It is found that entropy generation decreases as Knudsen number increases, and increases as Reynolds, Prandtl, Eckert numbers and the non-dimensional temperature difference increase.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation in rectangular microchannels

Kuddusi

2016

IJEX

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Entropy generation in a rectangular microchannel with fully developed steady gaseous flow at slip flow regime is studied. Two different thermal versions, uniform temperature (H1) and uniform heat flux (H2) on the walls, are considered. Analytically obtained expressions for temperature and velocity fields are used for entropy generation calculations. The effects of rarefaction, geometry, Peclet number Pe and group parameter Br/Ω on entropy generation (irreversibility) and local variation of entropy generation are explored. The main findings are; irreversibility decreases with rarefaction regardless of the thermal versions, irreversibility increases with aspect ratio for H1 thermal version and exhibits very little change with aspect ratio for H2 thermal version. For H1 thermal version the points of maximal entropy generation are at the middle of walls. For H2 thermal version entropy generation is generally high at immediate vicinity of walls and decreases by departing the walls toward the centre of the microchannel.

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Section: Introductionmentioning

confidence: 99%

Entropy generation in rectangular microchannels

Kuddusi

2016

IJEX

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“…The Bejan number is a dimensionless number defined as the entropy generation ratio of the thermal irreversibility over the total entropy generation [30,31]. That is:…”

Section: All the Input Data For Calculationmentioning

confidence: 99%

Numerical Study of Entropy Generation in a Flowing Nanofluid Used in Micro- and Minichannels

Hassan

Sadri

Ahmadi

et al. 2013

Entropy

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This article mainly concerns theoretical research on entropy generation influences due to heat transfer and flow in nanofluid suspensions. A conventional nanofluid of alumina-water (Al 2 O 3 -H 2 O) was considered as the fluid model. Due to the sensitivity of entropy to duct diameter, mini-and microchannels with diameters of 3 mm and 0.05 mm were considered, and a laminar flow regime was assumed. The conductivity and viscosity of two different nanofluid models were examined with the help of theoretical and experimentally determined parameter values. It was shown that order of the magnitude analysis can be used for estimating entropy generation characteristics of nanofluids in mini-and microchannels. It was found that using highly viscous alumina-water nanofluid under laminar flow regime in microchannels was not desirable. Thus, there is a need for the development of low viscosity alumina-water (Al 2 O 3 -H 2 O) nanofluids for use in microchannels under laminar flow condition. On the other hand, Al 2 O 3 -H 2 O nanofluid was a superior coolant under laminar flow regime in minichannels. The presented results also indicate that flow friction and thermal irreversibility are, respectively, more significant at lower and higher tube diameters.The image canno t be display ed. Yo ur co mputer may no t hav e eno ugh memo ry to o pen the image, o r the image may hav e been co rrupted. Restart y o ur co mp uter, and then o p en the file ag ain. If the red x still ap p ears, y o u may hav e to d elete the imag e and then inser t it again.

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“…In one of such works, Haddad et al [4] studied numerically the entropy generation in fluid flow through parallel plate microchannel. The fluid flow is assumed to be steady laminar.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Conical Micro-Diffusers and Micro-Nozzles Considering Entropy Generation

Ben‐Mansour

Sahin

2012

Arab J Sci Eng

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Fluid flow characteristics and entropy generation in a circular diffuser/nozzle element are studied numerically. The flow is assumed to be isothermal, laminar and incompressible with constant thermo-physical properties. The velocity field, mass flow rate, and entropy generation are investigated for several half angles in combination with several values of pressure drops. The effect of diffuser half angle on the entropy generation is investigated and discussed. Furthermore, the effect of the half angle of diffuser on the diffuser efficiency and the effect on the rectification efficiency are explained. It is shown that there is an optimum operation half angle for which the diffuser efficiency has a maximum value. In the case of a micro-diffuser 1 mm long with an inlet diameter of 100 µm, the optimum half angle was found to be 2.5 • . These results are based on several parametric simulations ranging from 0 to 7 • half angles and covering pressure drops between 500 and 2000 Pa. Keywords List of Symbols

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Entropy Generation Due to Laminar Incompressible Forced Convection Flow Through Parallel-Plates Microchannel

Cited by 74 publications

References 13 publications

Entropy generation in rectangular microchannels

Entropy generation in rectangular microchannels

Numerical Study of Entropy Generation in a Flowing Nanofluid Used in Micro- and Minichannels

Optimization of Conical Micro-Diffusers and Micro-Nozzles Considering Entropy Generation

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