Numerical simulation of heat transfer in gas-particle two-phase flow with smoothed discrete particle hydrodynamics
Numerical simulation of heat transfer in gas-particle two-phase flow with smoothed discrete particle hydrodynamics
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DOI：
10.7498/aps.63.230206
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发表时间：
2014-12
期刊：
影响因子：
--
通讯作者：
C. Fu-zhen;Qiang Hong-fu;Gao Wei-ran
中科院分区：
文献类型：
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作者：
C. Fu-zhen;Qiang Hong-fu;Gao Wei-ran
气粒两相流中颗粒之间以及气相与颗粒相之间的传热不容忽视。光滑离散粒子流体力学作为一种求解气粒两相流的新方法，已成功应用于气沙输运模拟。基于平滑离散粒子流体力学方法，本文提出了热传导模型，用于模拟气-粒子两相流中的传热过程和粒子蒸发。首先，提出了要求解的方程，其中引入了每个相的能量方程，并且通过将标准平滑粒子流体动力学一阶导数与一阶导数的有限差分近似相结合来处理传导中的二阶导数项。颗粒和气体之间的热传导是根据温差和传热系数计算的。对圆盘型颗粒团簇问题和气泡流化床问题进行了模拟，结果与两种流体模型的模拟结果非常吻合。采用离散相液滴的汽化定律来处理颗粒蒸发，然后模拟射流蒸发。数值结果均与离散粒子模型结果吻合良好。表明新方法具有良好的准确性和实际适用性。
Heat transfer between particles and that between gas phase and particle phase in gas-particle two-phase flow cannot be ignored. Smoothed discrete particle hydrodynamics, as a new method for solving the gas-particle two-phase flow, has been used in simulating the aerolian sand transport successfully. Based on the smoothed discrete particle hydrodynamics method, a heat conduction model is presented in this paper and is used to simulate the heat transfer processes and the particle evaporation in gas-particle two-phase flow. Firstly, the equations to be solved are presented in which the energy equations are introduced for each phase and the second derivative item in conduction is treated by combining a standard smoothed particle hydrodynamics first derivative with a finite difference approximation of a first derivative. The heat conduction between particle and gas is computed from temperature difference and heat transfer coefficient. The disc-type particle cluster problem and bubble fluidized bed are simulated and the results are in close agreement with the two fluid model simulation results. The vaporization law for discrete phase droplet is used to deal with the particle evaporation and then a jet evaporation is simulated. Numerical results all show a good agreement with the discrete particle model results. It is indicated that the new method is of good accuracy and practical applicability.