Effects of viscous dissipation and temperature dependent viscosity in thermally and simultaneously developing laminar flows in microchannels

Giudice, S. Del; Nonino, C.; Savino, S.

doi:10.1016/j.ijheatfluidflow.2006.05.007

Cited by 46 publications

(15 citation statements)

References 24 publications

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“…Numerical studies of [13,14] have partly addressed this issue. However, it is of paramount significance to consider the temperature-dependent variation of both the fluid viscosity and thermal conductivity in the analysis of MFDs [15][16][17], especially at low Reynolds numbers, whereas quantities such as density and specific heat can be considered as constant [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of viscous heating, fluid property variation, velocity slip, and temperature jump on convection through parallel plate and circular microchannels

Hooman

Ejlali

2010

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Effects of viscous heating, fluid property variation, velocity slip, and temperature jump on convection through parallel plate and circular microchannels

Hooman

Ejlali

2010

International Communications in Heat and Mass Transfer

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“…Nonino et al [23] investigated the laminar forced convection at the entrance region of the straight ducts with variable viscosity according to an exponential relation by a finite element procedure, considering different cross-sectional geometries. Afterwards, they adopted the same procedure to study the effects of the viscous dissipation and temperature dependent viscosity in thermally and simultaneously developing laminar flows [24]. A series of work by Mahulikar and…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the axial heat conduction with variable fluid properties in a forced laminar flow tube

Zhai

Quan

et al. 2017

International Journal of Heat and Mass Transfer

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Copyright and Reuse:© 2017 Elsevier Ltd. This manuscript version is made available under the terms of the Creative Commons Attribution-NonCommercialNoDerivatives License CC BY NC-ND 4.0 ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. and solid wall to fluid thermal conductivity ratio of 100, the maximum Nu deviation between constant and variable properties are up to 7.33% at the entrance part for water in the temperature range of 50℃, and 4.45% at the entrance part for n-decane in the temperature range of 120℃, as well as 2.20% at the ending part for air in the temperature range of 475℃, respectively. In addition, the average Nu deviation for water, n-decane and air are 3.24%, 1.94% and 1.74%, respectively. Besides, Nu decreases drastically with decreasing Pe when Pe≤500 and with increasing solid wall to fluid thermal conductivity ratio ( sf k ) when sf k ≤100. It is also found that variable properties have more obvious effects on the velocity profile at the upstream part while more obvious effects on the temperature profile at the downstream part. Enquiries KeywordsConjugate heat transfer; laminar flow; axial heat conduction; variable fluid properties; Nusselt number.

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“…Del Giudice et al [2] studied the effect of viscous dissipation and viscosity in developing laminar flows in microchannels. They found that both temperature dependence of viscosity and viscous dissipation have significant role in laminar forced convection in straight microchannels.…”

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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Effects of viscous dissipation and temperature dependent viscosity in thermally and simultaneously developing laminar flows in microchannels

Cited by 46 publications

References 24 publications

Effects of viscous heating, fluid property variation, velocity slip, and temperature jump on convection through parallel plate and circular microchannels

Effects of viscous heating, fluid property variation, velocity slip, and temperature jump on convection through parallel plate and circular microchannels

Numerical analysis of the axial heat conduction with variable fluid properties in a forced laminar flow tube

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

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