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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study of falling film flow on a horizontal rotating tube
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Numerical study of falling film flow on a horizontal rotating tube

机译：水平旋转管上降膜流动的数值研究

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摘要

In this paper, a CFD simulation of falling film on a horizontal rotating tube is illustrated. The objective of this simulation is to explore the influence of various parameters on this kind flow. The simulation results show that in a certain range, the offset angle of the liquid column increases with the increase of the rotational speed, which agrees well with the experimental values. Compared to a stationary tube, the liquid film thickness at the left side of the liquid column is thinner but the right gets larger when the tube is rotating counterclockwise. And the liquid film velocity at the left side of the liquid column is equivalent to the linear superposition of the velocity at the standstill and the rotational velocity denoted by ω. Rotation has a great influence on the velocity distribution at the right side of liquid column. Increasing the rotational speed and the diameter, decreasing the inlet velocity and the inlet hole diameter will make the offset angle of the liquid film larger. The high temperature reduces the offset angle of the liquid column, and the gradient of the liquid column offset angle to temperature becomes smaller. When the temperature is above 65 ℃, the effect of temperature on the offset angle of liquid column is negligible. When ω - 200 rpm, the offset angle increases first and then decreases with the increase of the inlet height, but when ω = 300 rpm, the offset angle increases with the increase of the inlet height.
机译：本文说明了水平旋转管上降膜的CFD模拟。该模拟的目的是探索各种参数对这种流动的影响。仿真结果表明，在一定范围内，液柱的偏角随转速的增加而增大，与实验值吻合较好。与固定管相比，液柱左侧的液膜厚度更薄，但是当管逆时针旋转时，右侧的液膜厚度会变大。并且，液柱左侧的液膜速度相当于静止时的速度与ω所表示的旋转速度的线性叠加。旋转对液柱右侧的速度分布影响很大。增加旋转速度和直径，减小入口速度和入口孔直径将使液膜的偏移角更大。高温减小了液柱的偏移角，并且液柱的偏移角相对于温度的梯度变小。当温度高于65℃时，温度对液柱偏移角的影响可以忽略不计。当ω-200 rpm时，偏移角先增加，然后随入口高度的增加而减小，但是当ω= 300 rpm时，偏移角随入口高度的增加而增加。

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