The volume-based properties for dimensional analysis of micro heat exchanger

Tharkar, Ankush D.; Mahulikar, Shripad P.

doi:10.1007/s10973-019-08707-6

Cited by 1 publication

(1 citation statement)

References 33 publications

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“…The miniature modern machines in medical, chemical and information technology demand highly effective and space-efficient heat exchanging devices. The heat transfer and hydrodynamic features of micro ducts have been investigated enormously in past few years by following researchers: Gulhane and Mahulikar [1], Mala et al, [2], Sobhan and Garimella [3], Morini [4], Hetsroni et al, [5], Kandlikar and Steinke [6], Hong and Asako [7], van Rij et al, [8], Kandlikar [9], Garimella and Sobhan [10], Prabhu and Mahulikar [11], Adham et al, [12], Dixit and Ghosh [13], Rastogi and Mahulikar [14], Tharkar and Mahulikar [15], Tharkar and Mahulikar [16] and Kumar et al, [17]. There are still great variations in the reported data.…”

Section: Introductionmentioning

confidence: 99%

CFD study of Convective Heat Transfer of Water Flow Through Micro-Pipe with Mixed Constant Wall Temperature and Heat Flux Wall Boundary Conditions

Pasha

Alharbi

Halkarni

et al. 2021

CFDL

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The dissipation of heat in tiny engineering systems can be achieved with fluid flow through micro pipes. They have the advantage of less volume to large surface ratio convective heat transfer. There are deep-rooted analytical relations for convective heat transfer available for fluid flow through macro size pipes. But differences exist between the convective heat transfer for fluid flow through macro and micro pipes. Therefore, there is a good scope of work in micro convection heat transfer to study the mechanism of fundamental flow physics. There have been studies with either constant heat flux wall boundary conditions or constant wall temperature boundary conditions with constant and variable property flows. In this article, first, the numerical simulations are validated with the experimental data for 2D axisymmetric conventional pipe with pipe diameter of 8 mm is taken with laminar, steady, and single-phase water flows with constant wall heat flux boundary condition of 1 W/cm2. The computed Nusselt number is compared to the experimental results at different Reynolds numbers of 1350, 1600 and 1700. In the next study, three-dimensional micropipe laminar flow is studied numerically using water with an inlet velocity of 3 m/s and pipe diameter of 100 µm. The mixed wall boundary conditions with upper half pipe surface subjecting to constant wall temperature of 313 K and lower half surface subjecting to 100 W/cm2 are used in the simulations. The focus of research would be to consider the effect of temperature-dependent properties like thermal conductivity, viscosity, specific heat, and density (a combined effect we call it as variable properties) on micro-pipe flow characteristics like Nusselt number at mixed wall boundary conditions and compare it with the constant property flows. The conventional pipe showed no significant difference with variable and constant property flows with different Reynolds numbers. On contrary the flow through 3D micropipe shows that the Nusselt number with variable property flows is less as compared to the constant property flows.

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