摘要
本文利用实施给定热流边界条件的DSMC方法,对短通道内给定壁面热流边界条件下的气体换热情况进行了模拟．结果表明,壁面热流密度增大导致通道内压力分布非线性程度增加。随着热流密度的增大,截面速度分布趋于平缓,滑移速度增大。给定热流密度的通道壁面温度与气流截面平均温度的差值沿程增大,温度梯度沿程下降,气体稀薄性增大时,通道换热减弱。
A new technique for the treatment of heat flux specified boundary condition in direct simulation Monte Carlo （DSMC） method is used to simulate gas flow and heat transfer in short microchannel. It is found that, with the increase of the wall heat flux, the nonlinear pressure distribution becomes more evident and the cross-section velocity distribution becomes more flat. The slip velocity increases with the increase of the wall heat flux. The difference between the wall temperature and the bulk temperature of gas increases along the channel while the gradients of both the wall temperature and the bulk temperature decrease along the channel. It is also found that the heat transfer decreases with the increase of gas rarefaction.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第4期643-645,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50376050)
关键词
DSMC
给定热流边界
换热特性
微通道
direct simulation Monte Carlo
heat flux specified boundary condition
heat transfer characteristics
microchannel
