微納通道中牛頓流體毛細(xì)流動(dòng)的研究進(jìn)展
[Abstract]:Capillary flow has been widely used in many fields, such as natural science and engineering technology. In recent years, capillary flow in micro-nano channels has been widely used in micro / nano electromechanical systems, biomedicine, environmental monitoring, petroleum exploitation, porous media seepage and so on. The Lucas-Washburn (LW) model is used to describe the capillary flow process of macroscopic Newtonian fluids. The applicability of the model in micro and nano channels is still uncertain, so it has attracted much attention from the international academic circles. In this paper, the research progress of capillary flow of Newtonian fluid in micro and nano channels is reviewed from three aspects: (1) inertial force region. The flow distance is proportional to the time t; (2) the viscous force-inertial force zone, the inertial force, the capillary force, and the viscous force all have an effect on the flow; (3) the viscous force zone, the viscous force and the capillary force balance, The flow distance is proportional to t ~ (1 / 2). (4) the influence of gravity should be taken into account in vertical pipeline. The LW model can still be used to describe the capillary flow process in micro and nano channels qualitatively, but it is necessary to introduce the correction of dynamic contact angle, bubble, electric viscosity and so on. Finally, in view of some problems existing in the current experimental research, the direction of further research is summarized. In addition, the study of capillary flow of non-Newtonian fluids is also briefly introduced and prospected.
【作者單位】: 清華大學(xué)工程力學(xué)系熱科學(xué)與動(dòng)力工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金(51322603,51136001,51356001,51321002) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃資助
【分類號(hào)】:O363.2
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