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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Azimuthal and radial flow patterns of 1g-Geldart B-type particles in a gas-solid vortex reactor
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Azimuthal and radial flow patterns of 1g-Geldart B-type particles in a gas-solid vortex reactor

机译：气固涡流反应器中1g-Geldart B型颗粒的方位角和径向流动模式

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Processes requiring intensive interfacial momentum, mass and heat exchange between gases and particulate solids can be greatly enhanced by operating in a centrifugal field. This is realized in the Gas-Solid Vortex Reactor (GSVR) with centrifugal accelerations up to two orders of magnitude higher than the Earth's gravitational acceleration. Here, the flow patterns of two 1g-Geldart B-type particles are experimentally assessed, over the gas inlet velocity range 82-126 m s(-1), in an 80 mm diameter and 15 mm height GSVR. The particles are monosized aluminum spheres of 0.5 mm diameter, and walnut shell in the sieve fraction 0.50-0.56 mm and aspect ratio 1.3 +/- 0.2. Two dimensional Particle Image Velocimetry combined with Digital Image Analysis and pressure measurements revealed that periodic fluctuations in solids azimuthal and radial velocity between gas inlet slots are strongly related to the average solids azimuthal velocity and bed uniformity. Aluminum particles feature steeper changes in azimuthal velocity and more attenuated changes in radial velocity than walnut shell particles. Within the assessed gas inlet velocity range the solids bed of aluminum exhibits average azimuthal velocities and bed voidages 40-50% and approximate to 10% lower than those of walnut shell. The aerodynamic response time of the particles, i.e. rho(s)d(p)(2)/18 mu(g), emerged as an important parameter to assess the influence of the carrier gas jet on the radial deflection of the particles and the interaction solids bed-outer wall. Too low aerodynamic response time relates to nonuniformity in bed voidage due to solids radial velocity fluctuations. Excessive aerodynamic response time indicates low solids azimuthal velocities due to solids bed-outer wall friction. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过在离心区域中操作，可以大大提高需要压力界面动量，气体和颗粒状固体之间的质量和热交换的过程。这在气体固体涡流反应器（GSVR）中实现，离心加速度高于地球引力加速度高的两个数量级。这里，在80mm直径和15mm高度GSVR中，通过对燃气入口速度范围进行实验评估两种1G-Geldart B型颗粒的流动模式。颗粒是直径为0.5mm的单彩色铝球，筛窦壳体馏分0.50-0.56mm，纵横比1.3 +/- 0.2。二维粒子图像速度与数字图像分析和压力测量相结合，显示出气体入口槽之间固体方位角和径向速度的周期性波动与平均固体方位角速度和床均匀性强烈相关。铝颗粒具有比核桃壳颗粒的径向速度更加衰减，更衰减的变化更加衰减。在评估的气体入口速度范围内，铝的固体床均显示平均方位角速度和床空隙40-50％，近似低于核桃壳的10％。颗粒的空气动力学响应时间，即rho（s）d（p）（2）/18μm（g），作为评估载气射流对颗粒的径向偏转的影响的重要参数。相互作用固体床外墙。由于固体径向速度波动，太低的空气动力学响应时间与床中的床无均匀性有关。过度的空气动力学响应时间表示由于固体床外壁摩擦，低固体方位角速度。 （c）2019年Elsevier B.V.保留所有权利。

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