The viscous dissipation effect on heat transfer and fluid flow in micro-tubes

Lelea, Dorin; Cioablă, Adrian Eugen

doi:10.1016/j.icheatmasstransfer.2010.06.030

Cited by 15 publications

(8 citation statements)

References 20 publications

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“…Lelea and Cioabla [20] investigated numerically the effects of viscous dissipation on heat transfer and fluid flow in micro-tubes. Three different fluids, water and two dielectric fluids, HFE-7600 and FC-70 were used.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Salman¹,

Mohammed²,

Kherbeet³

2014

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Salman¹,

Mohammed²,

Kherbeet³

2014

International Communications in Heat and Mass Transfer

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“…In relation to microscale heat transfer, some researchers have reported results obtained for the Nusselt number in good agreement with the classical theory [25,[30][31][32][33]. However, other researchers have indicated that differences in rates and coefficients of heat transfer, as well as in Nusselt number, can be related to the flow velocity and fluid temperature [16,[34][35][36], the Reynolds number [9], the heat transfer conjugated [2,[37][38][39], the viscous dissipation [16,20,26,40,41], the surface roughness [42], the aspect ratio of microchannels [5,43] and the conductivity of the material that compose them [2,[37][38][39], besides experimental uncertainties [4,[30][31][32][33]44]. Some numerical studies [45,46] showed that the Nusselt number is more sensitive to the shape of the cross-section of the microchannels in comparison to other parameters, such as surface roughness, for example.…”

Section: Introductionmentioning

confidence: 89%

Numerical Analysis About the Influence of Inappropriate Shape of the Cross-Section of Microchannels in Laminar Flow

Hollweg¹,

Oliveski²,

Corte³

2014

Proceedings of the 3rd South-East European Conference on Computational Mechanics (SEECCM III)

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In the past decades, several experimental investigations performed to the hydrodynamics and heat transfer in microscale laminar flow have showed divergences to the Darcy friction factor and the Poiseuille and Nusselt numbers, when the results obtained for the same ones were compared to those provided by classical theory. There are reports of deviations to the Darcy friction factor and the Poiseuille and Nusselt numbers attributed to geometric imperfections at the cross-section of the microchannels. The aim of this numerical study is to analyze how the hydrodynamic and heat transfer characteristics in single-phase laminar flow, of a fluid with constant thermophysical properties, can be affected by imperfections at the cross-section of the microchannels. The results obtained for single-phase laminar flow of water in microchannels with imperfections at the cross-section are compared to those obtained for a geometrically perfect microchannel through Poiseuille and Nusselt numbers. Deviations at Poiseuille and Nusselt numbers due to imperfections at the cross-section of the microchannels were verified. The results showed that Nusselt number is more sensitive to shape of the cross-section of the microchannels than Poiseuille number. This study showed that knowledge about the geometrical shape of the cross-section of the microchannels is important to determine properly the hydrodynamic parameters of the flow, such as Poiseuille number. This study was carried out through computational fluid dynamics (CFD) and the numerical model made up by mass conservation, Navier-Stokes and energy equations.

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“…In this work, obtained results are given by Po numbers for different parameters. Lelea and Cioabla [16] numerically investigated a conjugate heat transfer problem with viscous dissipation in micro-tubes. They compare the effects of viscous heating on Nu and Po numbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of second order slip flow conditions on interfacial heat transfer in micro pipes

Şen

2019

Sādhanā

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Heat transfer that occurs in micro scale devices has a very important place among the engineering applications that cooling or heating. This heat transfer mechanism in devices having dimensions at micron level is a completely different problem in the macro level analysis. Therefore, in the calculations made, the flow events and heat transfer in micron scale pipes are calculated by using more realistic expressions. For this reason, in this study heat transfer in a circular micro pipe with wall and fluid conjugation for laminar rarefied gas flow in transient regime is investigated under the second order slip boundary conditions at the interface. Patankar's control volume method is used here to solve the problem numerically. This analysis includes of axial conduction, viscous dissipation and rarefaction effects which are indispensable in micro-flow structure. From the results, it is seen that the values that are indicating heat transfer are excessively affected by wall thickness, viscous heating and gas rarefaction especially in transient regime.

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The viscous dissipation effect on heat transfer and fluid flow in micro-tubes

Cited by 15 publications

References 20 publications

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Numerical Analysis About the Influence of Inappropriate Shape of the Cross-Section of Microchannels in Laminar Flow

Numerical investigation of the effect of second order slip flow conditions on interfacial heat transfer in micro pipes

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