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首页> 外文期刊>Journal of Mechanical Science and Technology >Numerical study on characteristics of turbulent two-phase gas-particle flow using multi-fluid model
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Numerical study on characteristics of turbulent two-phase gas-particle flow using multi-fluid model

机译：基于多流体模型的湍流两相湍流特性数值研究

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The purpose of this research is to study numerically the turbulent gas-particle two-phase flow characteristics using the Eulerian-Eulerian method. A computer code is developed for the numerical study by using the k-?-k p two-phase turbulent model. The developed code is applied for particle-laden flows in which the particle volume fraction is between 10?5 and 10?2 for the Stokes numbers smaller than unity. The gas and particle velocities and the particle volume fraction obtained by using this code are in good agreement with those obtained by a commercial code for the gas-particle jet flows within a rectangular enclosure. The gas-particle jet injected into a vertical rectangular 3D enclosure is numerically modeled to study the effect of the Stokes number, the particle volume fraction and the particle Reynolds numbers. The numerical results show that the Stokes number and the particle volume fraction are important parameters in turbulent gas-particle flows. A small Stokes number (St ≤ 0.07) implies that the particles are nearly at the velocity equilibrium with the gas phase, while a large Stokes number (St ≥ 0.07) implies that the slip velocity between the gas and particle phase increases and the particle velocity is less affected by the gas phase. A large particle volume fraction (α p ≥ 0.0001) implies that the effect of the particles on the gas phase momentum increases, while a small particle volume fraction (α p ≤ 0.0001) implies that the particles would have no or small effect on the gas flow field. For fixed Stokes number and particle volume fraction, an increase of the particle Reynolds number results in a decrease of the slip velocity between the gas and particle velocities.
机译：本研究的目的是使用欧拉-欧拉方法对湍流气态两​​相流动特性进行数值研究。通过使用k-？-k p 两相湍流模型，开发了用于数值研究的计算机代码。所开发的代码适用于载重粒子流，其中对于小于1的斯托克斯数，粒子体积分数在10？5 和10？2 之间。通过使用该代码获得的气体和颗粒速度以及颗粒体积分数与通过商业代码获得的用于矩形外壳内的气体-颗粒射流的气体和颗粒速度分数非常吻合。对注入到垂直矩形3D外壳中的气体微粒射流进行了数值建模，以研究斯托克斯数，粒子体积分数和粒子雷诺数的影响。数值结果表明，斯托克斯数和颗粒体积分数是湍流颗粒流中的重要参数。较小的斯托克斯数（St≤0.07）表示粒子几乎与气相处于速度平衡，而较大的斯托克斯数（St≥0.07）表示气相和粒子相之间的滑移速度增加并且粒子速度受气相影响较小。较大的颗粒体积分数（αp ≤0.0001）表示颗粒对气相动量的影响增加，而较小的颗粒体积分数（αp ≤0.0001）意味着颗粒会对气流场没有影响或影响很小。对于固定的斯托克斯数和颗粒体积分数，颗粒雷诺数的增加导致气体和颗粒速度之间的滑移速度降低。

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