滑移区气体-颗粒流动与传热特性研究

Numerical study on gas-particle flow and heat transfer characteristics in slip flow regime

中文关键词: 微尺度流动与传热  气-粒两相流  数值模拟

英文关键词: micro-scale flow and heat transfer  gas-particle fluid  numerical simulation

中文摘要:

      针对气体-颗粒微尺度流动与传热过程开展数值模拟研究，所构建模型中气体处理为可压缩、变物性流体，并在颗粒表面采用速度滑移和温度跳跃边界条件以考虑气体稀薄效应。在数值模拟基础上，研究分析稀薄效应对颗粒与其周围气体流动与换热的影响程度，并进一步提出新的阻力系数与传热努谢尔特数关联式。研究结果表明，气体稀薄效应将减小颗粒阻力系数，同时抑制颗粒与其周围气体的传热过程。

英文摘要:

      A numerical model considering compressibility and variability of gas fluid was established to study the gas-particle flow and heat transfer characteristics in the slip regime. The velocity slip and temperature jump boundary conditions were implemented at the gas-particle interface to describe the micro scale effect. The influence of rarefaction effects on flow and heat transfer was investigated based on the numerical results. Moreover, the novel correlations for drag coefficient and heat transfer Nusselt number were proposed through a non-linear method. The results show that the rarefaction effects decrease both the drag coefficient on the surface of particles and the heat transfer process between gas and micro particles.