文献类型：期刊文献

英文题名：Flow of Non-Newtonian Fluids in a Single-Cavity Microchannel

作者：Raihan, Mahmud Kamal[1];Jagdale, Purva P.[1];Wu, Sen[1,2];Shao, Xingchen[3];Bostwick, Joshua B.[1];Pan, Xinxiang[2,4];Xuan, Xiangchun[1]

机构：[1]Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA;[2]Dalian Maritime Univ, Coll Marine Engn, Dalian 116026, Peoples R China;[3]Johns Hopkins Univ, Dept Chem & Biomol Engn, Baltimore, MD 21218 USA;[4]Guangdong Ocean Univ, Maritime Coll, Zhanjiang 524088, Peoples R China

年份：2021

卷号：12

期号：7

外文期刊名：MICROMACHINES

收录：SCI-EXPANDED(收录号：WOS:000676587100001)、、EI(收录号：20213110702924)、Scopus(收录号：2-s2.0-85111405016)、WOS

基金：This work was supported in part by Clemson University through a SEED grant (X.X.), China Scholarship Council (CSC) through the Chinese Government Graduate Student Overseas Study Program (S.W.), and NSF under grant number CBET-1750208 (J.B.B.).

语种：英文

外文关键词：polymer solution; viscoelasticity; shear thinning; inertia; microfluidic model; porous media

外文摘要：Having a basic understanding of non-Newtonian fluid flow through porous media, which usually consist of series of expansions and contractions, is of importance for enhanced oil recovery, groundwater remediation, microfluidic particle manipulation, etc. The flow in contraction and/or expansion microchannel is unbounded in the primary direction and has been widely studied before. In contrast, there has been very little work on the understanding of such flow in an expansion-contraction microchannel with a confined cavity. We investigate the flow of five types of non-Newtonian fluids with distinct rheological properties and water through a planar single-cavity microchannel. All fluids are tested in a similarly wide range of flow rates, from which the observed flow regimes and vortex development are summarized in the same dimensionless parameter spaces for a unified understanding of the effects of fluid inertia, shear thinning, and elasticity as well as confinement. Our results indicate that fluid inertia is responsible for developing vortices in the expansion flow, which is trivially affected by the confinement. Fluid shear thinning causes flow separations on the contraction walls, and the interplay between the effects of shear thinning and inertia is dictated by the confinement. Fluid elasticity introduces instability and asymmetry to the contraction flow of polymers with long chains while suppressing the fluid inertia-induced expansion flow vortices. However, the formation and fluctuation of such elasto-inertial fluid vortices exhibit strong digressions from the unconfined flow pattern in a contraction-expansion microchannel of similar dimensions.