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Date of Publication:2020-01-01

Journal:Journal of Thermal Science and Technology

Affiliation of Author(s):能源与动力学院

Volume:19

Issue:4

Page Number:332-338

ISSN No.:1671-8097

Key Words:"gas-liquid two phase flow; falling film flow; liquid film fluctuate; film thickness"

CN No.:21-1472/T

Abstract:A physical model of falling film flow on two-dimensional vertical wall is established,and the laminar wave characteristics of falling film that the Reynolds number ranges from 200 to 1 000 is simulated with the VOF method.The fluctuation characteristics of falling film,velocity change in the direction of flow and the influence of Reynolds number are studied.The results show that the flow region can be divided into three parts according to the shape of the falling film:entrance area,development area and stability area.The shape of the liquid film in the entrance area is relatively smooth,the liquid film in the development area starts to show small amplitude fluctuation with high frequency,and the fluctuation amplitude increases in the stable area while the fluctuation frequency decreases.The maximum velocity in the entrance area is greater than the initial velocity,the maximum velocity in the development area fluctuates across the initial velocity,and the velocity in the stability area is completely less than the initial velocity.With the increase of Reynolds number,the liquid film thickness increases and the fluctuation amplitude decreases.

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