横向气流中非牛顿液体射流直接数值模拟

doi:10.7527/S1000-6893.2016.0004

Abstract

Abstract:

A direct numerical simulation study of a non-Newtonian liquid jet in crossflow is carried out with a moderate momentum flux ratio 6. The emphasis of this paper mainly focuses on the flow structure of the jet, including surface behaviors, bending phenomena, spreading features and non-Newtonian characteristics. Deep into the near-field region, it can be observed that the trajectory of the jet oscillates with time and has a tendency to move backward in the reverse direction of the crossflow. The spreading angle increases only at the start of the injection but keeps nearly constant afterwards at 35°. Further insight into the flow physics is obtained by visualizing the primary breakup of the jet, especially the formation of ligaments and droplets, as well as satellite droplets. In the near-field region, the flow feature is similar to that of a circular cylinder, while showing complex turbulent behavior in other regions. The specific non-Newtonian characteristics of the fluid are observed by analyzing the shear thinning viscosity, which varies over 20% spatially inside the liquid. Compared to Newtonian fluids, the current shear thinning non-Newtonian liquid jet shows a stronger breakup feature.

Key words: liquid jet, crossflow, non-Newtonian fluid, breakup, direct numerical simulation

CLC Number:

V231.2

ZHU Chengxiang, YOU Yancheng. Direct numerical simulation of a non-Newtonian liquid jet in crossflow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(9): 2659-2668.

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Direct numerical simulation of a non-Newtonian liquid jet in crossflow

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