Investigation the effects of an external driving force and cone shape of roughness on the phase change behavior of Argon fluid within a microchannel by molecular dynamic simulation
AS Goldanlou and M Zarringhalam and N Shirani and A Alizadeh and D Toghraie and S Rostami, JOURNAL OF MOLECULAR LIQUIDS, 313, 113503 (2020).
This work presents a study on the effects of roughness with a cone shape on the flow behavior of Argon fluid within a microchannel under phase change condition. The effective parameter on the results and discussion of this paper is propulsion force, which is exerted on the fluid at the entrance region of channels with roughened and smooth surfaces in order of 0.002, 0.01 & 0.02 eV/A. Roughness elements with cone geometry performed their role in favor of augmentation of heat transfer from channel walls to fluid flow due to the enhancement of effective contact surface between microchannel and fluid. Therefore, it helps to the distribution of particles from lateral bins to central bins of microchannel due to the acceleration of the boiling process. But. increasing external force up to 0.02 eV/A brings a noticeable instability in density profile at time step 1,000,000. Also, under worse cases of this study, the cone shape of roughness element can cause as much as 1% reduction in velocity profiles and between 2% to 2.5% in temperature profiles of Argon fluid flow, which can be ignorable. As a result, it is suggested to invest no cost to remove the cone geometry of roughness elements and prepare ideal smooth surfaces for practical application. Also, using a cone shape of roughness elements can even be useful when an external force is lower than 0.01 eV/angstrom. (C) 2020 Elsevier B.V. All rights reserved.
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