Abstract Particle resolved direct numerical simulations (PR-DNS) are conducted to study the forced convection process of a cold flow passing over a rotating hot ellipsoidal particle. The numerical model is firstly verified against previously published data on both stationary and rotating particles. Then, one hundred case studies are carried out by changing five particle aspect ratios, five Reynolds numbers and four particle spin numbers, respectively. The effects of particle rotation on drag coefficient (Cd), lift coefficient (Cl), moment coefficient (Cm) and average Nusselt number (Nu) are investigated in detail. The changing trends of Cd, Cl, Cm and Nu with the particle incident angle in different cases are comprehensively analysed and compared. Numerical results of a rotating non-spherical particle show quite interesting and different phenomena compared with the stationary case. It is indicated that the particle rotation must be considered when evaluating the momentum and heat transfer between non-spherical particles and fluids. The findings provide important evidence to properly evaluate the role of particle rotation in the macro-scale modelling of multiphase flows.

中文翻译：

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PR-DNS 关于流体中旋转椭球粒子的动量和传热

摘要 粒子分辨直接数值模拟 (PR-DNS) 用于研究冷流通过旋转热椭球粒子的强制对流过程。该数值模型首先根据先前发布的关于静止和旋转粒子的数据进行验证。然后，通过分别改变五个粒子纵横比、五个雷诺数和四个粒子自旋数来进行一百个案例研究。详细研究了粒子旋转对阻力系数（Cd）、升力系数（Cl）、力矩系数（Cm）和平均努塞尔数（Nu）的影响。综合分析比较了不同情况下Cd、Cl、Cm和Nu随粒子入射角的变化趋势。与静止情况相比，旋转非球形粒子的数值结果显示出非常有趣和不同的现象。指出在评价非球形粒子与流体之间的动量和传热时，必须考虑粒子的旋转。这些发现为正确评估粒子旋转在多相流宏观建模中的作用提供了重要证据。