每年出版 12 期
ISSN 打印: 1044-5110
ISSN 在线: 1936-2684
Indexed in
EFFECTS OF FLOW NONUNIFORMITY AND RELATIVE ACCELERATION ON DROPLET DYNAMICS
摘要
A computational study on the dynamics of single droplets is performed in two gas flows at moderately high Reynolds numbers. One is Poiseuille flow in which the gas is either nitrogen or helium and the other is a counterflow formed by two opposed streams of nitrogen. The focus of the study is to review the methodologies used for representing the effects of flow nonuniformity and relative acceleration on droplet motion at moderately high Reynolds numbers. The motion of the droplets is observed to be affected by flow nonuniformity and unsteadiness, characterized respectively by dimensionless parameters κ and Ac, and the effects due to nonuniformity and rate of change of relative velocity are separable. It is determined that acceleration and deceleration affect the drag and lift on droplets in dissimilar ways. The lift force caused by flow nonuniformity is in the same direction as к in Poiseuille flow, whereas it is in the opposite direction as κ in counterflow. It is noted that the radius of curvature of droplet trajectory affects lift force more strongly than drag force. Modified correlations for the drag and lift coefficients as functions of the Reynolds number and dimensionless parameters characterizing the flow nonuniformity and unsteadiness are proposed.
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