Numerical simulation on dense phase pneumatic conveying of pulverized coal in horizontal pipe at high pressure
Numerical simulation on dense phase pneumatic conveying of pulverized coal in horizontal pipe at high pressure
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DOI：
10.1016/j.ces.2009.12.025
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发表时间：
2010-04
影响因子：
4.7
通讯作者：
Wenhao Pu;Changsui Zhao;Y. Xiong;C. Liang;Xiaoping Chen;Peng Lu;Chunlei Fan
中科院分区：
文献类型：
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作者：
Wenhao Pu;Changsui Zhao;Y. Xiong;C. Liang;Xiaoping Chen;Peng Lu;Chunlei Fan
在基于颗粒流动力学理论的双流体模型中加入了动摩擦应力相加的动摩擦模型，模拟了水平管密相气力输送煤粉的三维流动行为。动应力由颗粒流的动力学理论模拟，而摩擦应力由Johnson和Jackson[1987]提出的法向摩擦应力模型组合而成。散体材料的摩擦-碰撞本构关系及其在平面剪切中的应用。流体力学杂志176，67-93]和Syamlal等人提出的模型化摩擦剪切粘度模型。[1993年。MFIX文档和理论指南，DOE/METC94/1004，NTIS/DE94000087。可从http://www.mfix.org]，获得电子版本，该版本经过修改以符合实验数据。由于固相和气相的雷诺数较大，气相和颗粒相均被视为湍流。通过实验对三种测量方法的预测结果进行了验证。预测的压力梯度与实验数据吻合较好。预测的截面固体浓度分布与电容层析成像(ECT)图像吻合较好，并讨论了表观速度对固体浓度分布的影响。演示了与高速摄像机拍摄的可视化照片类似的弹状流的形成和运动过程。
A kinetic–frictional model, which treats the kinetic and frictional stresses in an additive manner, was incorporated into the two fluid model based on the kinetic theory of granular flow to simulate three dimensional flow behaviors of dense phase pneumatic conveying of pulverized coal in horizontal pipe. The kinetic stress was modeled by the kinetic theory of granular flow, while the friction stress is from the combination of the normal frictional stress model proposed by Johnson and Jackson [1987. Frictional–collisional constitutive relations for granular materials, with application to plane shearing. Journal of Fluid Mechanics 176, 67–93] and the modeled frictional shear viscosity model proposed by Syamlal et al. [1993. MFIX documentation and theory guide, DOE/METC94/1004, NTIS/DE94000087. Electronically available from http://www.mfix.org], which was modified to fit experimental data. For the solid concentration and gas phase Reynolds number was high, the gas phase and particle phase were all treated as turbulent flow. The experiment was carried out to validate the prediction results by three kinds of measurement methods. The predicted pressure gradients were in good agreement with experimental data. The predicted solid concentration distribution at cross section agreed well with electrical capacitance tomography (ECT) image, and the effects of superficial velocity on solid concentration distribution were discussed. The formation and motion process of slug flow was demonstrated, which is similar to the visualization photographs by high speed video camera.