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International Heat Transfer Conference 15

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

Study on Liquid Film Thickness of Accelerated Slug Flow in Micro Tubes

DOI: 10.1615/IHTC15.tbf.008906
pages 7693-7702

Kenshiro Muramatsu
The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-0041; DENSO CORPORATION, 1-1 Showa-cho, Kariya, Aichi, 448-8661, Japan

Youngjik Youn
The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-0041, Japan

Youngbae Han
Hongik University, 2639 Sejong-ro, Jochiwon-eup, Sejong, 339-701, Korea

Keishi Yokoyama
The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-0041, Japan

Yosuke Hasegawa
Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan; Center of Smart Interfaces Technical University Darmstadt Petersenstr. 32, 64287 Darmstadt, Germany

Naoki Shikazono
The University of Tokyo, Tokyo, Japan


KEY WORDS: Two-phase/Multiphase flow, Nano/Micro scale measurement and simulation, Liquid film thickness, Micro tube, Unsteady flow, Phase-field method

Abstract

Liquid film in a slug flow plays an important role in heat exchangers and chemical reactors, since local heat and mass transfer is effectively enhanced at the thin liquid film region. To develop precise heat transfer models for micro-scale two phase flows, it is crucial to predict liquid film thickness accurately around the confined bubble. In this work, the liquid film thickness in accelerated flow under the adiabatic condition is investigated experimentally and numerically considering the initial steady flow velocity. The experimental study uses laser focus displacement meter to measure the liquid film thickness, and water is used as a working fluid. The effect of the initial flow velocity on the initial liquid film thickness is discussed. The numerical study employs Phase-Field method to capture the interface in micro tube slug flows. Flow fields of steady and accelerated flows are investigated from the numerical result.

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