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Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

Hader, Montasir / Al‐Kouz, Wael / Kiwan, Suhil / Alshare, Aiman / Chamkha, Ali

In this study, a computational fluid analysis of a slip flow developing thermally and hydrodynamically in a triangular microchannel has been considered. The wall of the channel is preserved at a fixed temperature. Temperature jump and velocity slip boundary conditions are imposed on the surfaces. The microchannel is constructed from seven triangular‐shaped channels and the angle of the microchannel (θ) is varied from 0° to 40°. Simulations are carried out for $1 \leq Re \leq 8, 0 \leq Kn \leq 0.1$ , and the air is used as a working fluid with variable physical properties. The simulation results show that the triangular microchannel can improve heat transfer as compared with plain microchannels. An optimal θ of 20° is found to provide the best heat transfer at moderate frictional losses. Finally, correlations for the average Nusselt number and the average friction coefficient among all parameters are proposed as follows: $\overset{̅}{Nu} = 4.015 {Re}^{0.0255} {Kn}^{- 0.1} {(\sin θ)}^{- 0.0479}$ , $\overset{̅}{C_{f}} = 3.71 {Re}^{- 1.218}$ ${Kn}^{- 0.296} {(\sin θ)}^{- 0.495}$ .

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Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

Hader, Montasir / Al‐Kouz, Wael / Kiwan, Suhil / Alshare, Aiman / Chamkha, Ali

In this study, a computational fluid analysis of a slip flow developing thermally and hydrodynamically in a triangular microchannel has been considered. The wall of the channel is preserved at a fixed temperature. Temperature jump and velocity slip boundary conditions are imposed on the surfaces. The microchannel is constructed from seven triangular‐shaped channels and the angle of the microchannel (θ) is varied from 0° to 40°. Simulations are carried out for $1 \leq Re \leq 8, 0 \leq Kn \leq 0.1$ , and the air is used as a working fluid with variable physical properties. The simulation results show that the triangular microchannel can improve heat transfer as compared with plain microchannels. An optimal θ of 20° is found to provide the best heat transfer at moderate frictional losses. Finally, correlations for the average Nusselt number and the average friction coefficient among all parameters are proposed as follows: $\overset{̅}{Nu} = 4.015 {Re}^{0.0255} {Kn}^{- 0.1} {(\sin θ)}^{- 0.0479}$ , $\overset{̅}{C_{f}} = 3.71 {Re}^{- 1.218}$ ${Kn}^{- 0.296} {(\sin θ)}^{- 0.495}$ .

Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

Hader, Montasir / Al‐Kouz, Wael / Kiwan, Suhil / Alshare, Aiman / Chamkha, Ali

In this study, a computational fluid analysis of a slip flow developing thermally and hydrodynamically in a triangular microchannel has been considered. The wall of the channel is preserved at a fixed temperature. Temperature jump and velocity slip boundary conditions are imposed on the surfaces. The microchannel is constructed from seven triangular‐shaped channels and the angle of the microchannel (θ) is varied from 0° to 40°. Simulations are carried out for $1 \leq Re \leq 8, 0 \leq Kn \leq 0.1$ , and the air is used as a working fluid with variable physical properties. The simulation results show that the triangular microchannel can improve heat transfer as compared with plain microchannels. An optimal θ of 20° is found to provide the best heat transfer at moderate frictional losses. Finally, correlations for the average Nusselt number and the average friction coefficient among all parameters are proposed as follows: $\overset{̅}{Nu} = 4.015 {Re}^{0.0255} {Kn}^{- 0.1} {(\sin θ)}^{- 0.0479}$ , $\overset{̅}{C_{f}} = 3.71 {Re}^{- 1.218}$ ${Kn}^{- 0.296} {(\sin θ)}^{- 0.495}$ .

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Titel:

Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

Beteiligte:

Hader, Montasir (Autor:in) / Al‐Kouz, Wael (Autor:in) / Kiwan, Suhil (Autor:in) / Alshare, Aiman (Autor:in) / Chamkha, Ali (Autor:in)

Erschienen in:

Heat Transfer ; 50 ; 3977-3995

Erscheinungsdatum:

01.06.2021

Format / Umfang:

19 pages

ISSN:

2688-4542 , 2688-4534

DOI:

https://doi.org/10.1002/htj.22060

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

slip velocity , triangular channel , temperature jump , Knudsen number

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