Hydrodynamics features of dispersed bubbles in the ventilated wake flow of a cylinder
作者： Ning Mao , Can Kang , Wisdom Opare , Yang Zhu
DOI: 10.1016/J.CJCHE.2018.04.002
关键词: Particle image velocimetry 、 Wake 、 Mechanics 、 Reynolds number 、 Hydraulic diameter 、 Bubble 、 Flow (psychology) 、 Materials science 、 Flow velocity 、 Volumetric flow rate
摘要: Abstract An experimental study was conducted to investigate the 2D bubbly flow downstream of a cylinder. Sparsely distributed bubbles were produced using ventilation method. The carrier measured particle image velocimetry (PIV) technique. shadow imaging technique used capture instantaneous images. image-processing code compiled identify in acquired image, calculate bubble equivalent diameter and velocity. effects Reynolds number rate injected air considered. result indicates that is featured by distinct structures wake region suppressed as upstream velocity increases. Regarding trapped flow, small increases with On whole, slightly lower than flow. consistency between high terms magnitude, which justified near edge. difference remarkable centerline. For certain number, increase rate, void fraction elevated.
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