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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

STUDY ON EFFECT OF COUNTER-CURRENT AIR FLOW ON FLOW BEHAVIOR OF LIQUID FALLING FILM OUTSIDE HORIZONTAL TUBES

Qinggang Qiu
School of Energy and Power Engineering, Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, No.2 Linggong Rd. Ganjingzi District, Dalian City. Liaoning Province 116024, China

Xiaocui Zhang
Dalian University of Technology, No.2 Linggong Rd. Ganjingzi District, Dalian City. Liaoning Province 116024, China

Xiaojing Zhu
School of Energy and Power Engineering, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian City, Liaoning Province,, China

Shengqiang Shen
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Key Laboratory for Desalination of Liaoning Province, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

DOI: 10.1615/IHTC16.mpf.023707
pages 6529-6536


KEY WORDS: Computational methods, Two-phase/Multiphase flow, VOF method, Falling film, Co-current air flow, Liquid film thickness, Flow behavior

Abstract

In this paper, the volume-of-fluid (VOF) method is used to simulate the falling process of liquid film outside the horizontal tubes. The corresponding Re number is 574 and the cross-section area of the wind tunnels is 50 mm*20 mm. The tube bundles are 1*2 (column*row) and the tube diameter is 25.4 mm. The counter-current air flow velocity ranges from 0 to 3 m/s and the interval velocity is 0.5 m/s. The 3-D numerical simulation results show that the liquid film thickness on the upper tube slightly decreases with the increasing velocity of counter-current air flow. The liquid film on the lower tube becomes thinner as the counter-current air flow velocities increase. The stability of falling film flow mode is barely affected by the small counter-current air flow velocities. However, the stable flow mode is destroyed when the air velocity increases to a certain value, and the flow mode transforms from the stable sheet mode to sheet-jet mode.

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