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仪器网/ 行业应用/ 解决方案/ 气体注入位置对于液体交叉流中气泡形成的影响

气体注入位置对于液体交叉流中气泡形成的影响

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Liquid flows incorporating small-size bubbles play a vital role in many industrial applications. In
this work, an experimental investigation is conducted on bubble formation during gas injection from
a microtube into the channel of a downward liquid cross flow. The tip of the air injector has been
located at the wall wall orifice and also at several locations from the wall to channel centerline
nozzle injection. The size, shape, and velocity of the bubbles along with liquid velocity field are
measured using a shadow-particle image velocimetry/particle tracking velocimetry system. The
process of bubble formation for the wall orifice and the nozzle injection configurations is physically
explained. The effect of variation in water and air flow rates on the observed phenomena is also
investigated by considering water average velocities of 0.46, 0.65, and 0.83 m/s and also air average
velocities of 1.32, 1.97, 2.63, and 3.29 m/s. It was observed that shifting the air injector tip toward
the center of the channel resulted in the coalescence of some of the preliminary bubbles and the
formation of larger bubbles termed secondary and multiple bubbles. Increase in air flow rate and
reduction in water flow rate also intensify the rate of bubble coalescence. A correlation-based model
is also suggested to overcome the shortcoming of the available models in the literature which are
developed to only estimate the size of the preliminary bubbles. The model predicts the percent of the
preliminary, secondary, and multiple bubbles along with the average size of secondary and multiple
bubbles as a function of nozzle position within a cross flow. 德国LaVision PIV/PLIF粒子成像测速场仪 阴影法激光粒径分析仪
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