文丘里粉尘测试仪中雾化的数值研究：山丘上颗粒的空气动力学
Numerical Investigation of Aerosolization in the Venturi Dustiness Tester: Aerodynamics of a Particle on a Hill.
作者信息
Palakurthi Nithin Kumar, Ghia Urmila, Turkevich Leonid A
机构信息
Mechanical and Materials Engineering, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, Ohio 45221-0072.
Engineering and Physical Hazards Branch (EPHB), Division of Field Studies and Engineering (DFSE), National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), 1090 Tusculum Avenue, Cincinnati, Ohio 45226.
出版信息
J Fluids Eng. 2022 Jun;144(6). doi: 10.1115/1.4054099.
Understanding particle detachment from surfaces is necessary to better characterize dust generation and entrainment. Previous work has studied the detachment of particles from flat surfaces. The present work generalizes this to investigate the aerodynamics of a particle attached to various locations on a model hill. The present work serves as a model for dust aerosolization in a tube, as powder is injected into the Venturi Dustiness Tester. The particle is represented as a sphere in a parallel plate channel, or, in two dimensions, as a cylinder oriented perpendicular to the flow. The substrate is modified to include a conical hill (3D) or wedge (2D), and the test particle is located at various positions on this hill. The governing incompressible Navier-Stokes equations are solved using the finite-volume FLUENT code. The coefficients of lift and drag are compared with the results on the flat substrate. Enhanced drag and significantly enhanced lift are observed as the test particle is situated near the summit of the hill.
了解颗粒从表面的脱离对于更好地表征粉尘的产生和夹带至关重要。先前的研究工作已经对颗粒从平坦表面的脱离进行了研究。目前的工作将此进行了拓展，以研究附着在模型山丘不同位置上的颗粒的空气动力学特性。目前的工作可作为粉末注入文丘里粉尘测试仪时管内粉尘气溶胶化的模型。在平行平板通道中，颗粒被表示为球体，或者在二维情况下，表示为垂直于气流方向的圆柱体。基底被修改为包含一个锥形山丘（三维）或楔形（二维），测试颗粒位于该山丘的不同位置。使用有限体积法的FLUENT代码求解不可压缩的纳维 - 斯托克斯控制方程。将升力系数和阻力系数与平坦基底上的结果进行比较。当测试颗粒位于山丘顶部附近时，观察到阻力增强且升力显著增强。
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