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气体微泊肃叶流动的离散模拟
Authors
沈国飞
葛蔚
Publication date
1 January 2010
Publisher
Abstract
泊肃叶流动是流体力学中一个经典问题,本文采用事件驱动的分子动力学方法,对微通道中恒定外力场驱动的气体微泊肃叶流动进行了离散模拟。在模拟中,气体被离散为大量的硬球颗粒,进出口采用周期性边界,壁面部分采用热边界。模拟的结果表明,随着克努森数的增加,气体的稀薄效应变得越来越明显,流动逐渐呈现出强烈的非牛顿特性:最高温度不再处于微通道中心而是向两壁移动并最终移至壁面区域,整个温度剖面也从"双峰结构"慢慢过渡到中心温度最低的"抛物线"型分布。此外,外力场强也显著地影响着气体的温度分布
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Last time updated on 09/11/2016