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Effect of granular properties on hydrodynamics in coarse-grid riser flow simulation of Geldart A and B particles

机译:粒状性质对Geldart A和B粒子粗栅提升管流动模拟流体动力学的影响

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摘要

In this work, a three-dimensional coarse-grid two-fluid model (TFM) simulation by varying granular properties like granular viscosity, frictional viscosity, and solids pressure has been performed. Simulated predictions were subsequently compared with experimental results in the case of Geldart A or B particles. Laminar flow behavior is also studied and coarse-grid simulation predictions were less realistic for laminar flow. This flow regime which although consumes less computational resources falls short for large-scale riser scale up. Flow regime in our simulation was fast fluidization and simulation predicts with minimum error near riser inlet. More specifically, granular viscosity, frictional viscosity and solids pressure for Type A particles predict with minimum error especially near riser inlet at a lower height. For Type B particles, these three solid properties correspond closely with experimental results near inlet at a lower height whereas, at a higher height, turbulence increases and simulation results deviate from experimental studies. (C) 2019 Elsevier B.V. All rights reserved.
机译:在这项工作中,通过改变粒状粘度,摩擦粘度和固体压力,通过改变粒状性质,三维粗栅两流体模型(TFM)模拟。随后将模拟预测与在Geldart A或B颗粒的情况下的实验结果进行比较。还研究了层流动行为,并且粗略栅格模拟预测对层流不太逼真。虽然消耗较少计算资源的流动制度对于大规模的提升者缩放而达到较短的。我们的模拟中的流动制度是快速流化,仿真预测,靠近立管入口附近的最小误差。更具体地,粒状粘度,摩擦粘度和固体压力为型颗粒预测,尤其是在较低高度的提升管入口附近。对于B型颗粒,这三种固体特性与在较低高度的入口附近的实验结果紧密相邻,而在较高的高度,湍流增加,仿真结果偏离实验研究。 (c)2019年Elsevier B.V.保留所有权利。

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