Thermo-hydrodynamics of a viscoelastic fluid under asymmetrical heating
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Author list: Sarma R., Nath A.J., Konwar T., Mondal P.K., Wongwises S.
Publisher: Elsevier
Publication year: 2018
Journal: International Journal of Heat and Mass Transfer (0017-9310)
Volume number: 125
Start page: 515
End page: 524
Number of pages: 10
ISSN: 0017-9310
eISSN: 1879-2189
Languages: English-Great Britain (EN-GB)
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Abstract
We investigate the influence of viscous dissipation on the convective heat transfer and entropy generation characteristics for the Poiseuille flow of a viscoelastic fluid in an asymmetrically heated slit microchannel. We use the simplified Phan -Thein -Tanner constitutive equations to describe the rheology of the fluid. Considering hydrodynamic slip at fluid-solid interface, we analytically solve the transport equations to obtain the velocity and temperature fields inside the flow domain, which are further used to evaluate the Nusselt number and the thermodynamic irreversibility generation rate. The results show that the present thermo-fluidic transport process is strongly influenced by the governing dimensionless parameters viz., the Brinkman number, heat flux ratio, viscoelastic group and slip coefficient. Finally, this study reveals that the Brinkman number and viscoelastic parameter have reverse effects on the Nusselt number and entropy generation rate as compared to the slip coefficient. ฉ 2018 Elsevier Ltd
Keywords
Asymmetric heat-flux, Interfacial slip, Viscoelastic fluid
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