Measurement of liquid film thickness in micro tube annular flow

Hiroshi Kanno*, Youngbae Han, Yusuke Saito, Naoki Shikazono

*この研究の対応する著者

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Heat transfer in micro scale two-phase flow attracts large attention since it can achieve large heat transfer area per density. At high quality, annular flow becomes one of the major flow regimes in micro two-phase flow. Heat is transferred by evaporation or condensation of the liquid film, which are the dominant mechanisms of micro scale heat transfer. Therefore, liquid film thickness is one of the most important parameters in modeling the phenomena. In macro tubes, large numbers of researches have been conducted to investigate the liquid film thickness. However, in micro tubes, quantitative information for the annular liquid film thickness is still limited. In the present study, annular liquid film thickness is measured using a confocal method, which is used in the previous study [1, 2]. Glass tubes with inner diameters of 0.3, 0.5 and 1.0 mm are used. Degassed water and FC40 are used as working fluids, and the total mass flux is varied from G = 100 to 500 kg/m2s. Liquid film thickness is measured by laser confocal displacement meter (LCDM), and the liquid-gas interface profile is observed by a high-speed camera. Mean liquid film thickness is then plotted against quality for different flow rates and tube diameters. Mean thickness data is compared with the smooth annular film model of Revellin et al. [3]. Annular film model predictions overestimated the experimental values especially at low quality. It is considered that this overestimation is attributed to the disturbances caused by the interface ripples.

本文言語English
ホスト出版物のタイトル2010 14th International Heat Transfer Conference, IHTC 14
ページ245-252
ページ数8
DOI
出版ステータスPublished - 2010 12 1
外部発表はい
イベント2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
継続期間: 2010 8 82010 8 13

出版物シリーズ

名前2010 14th International Heat Transfer Conference, IHTC 14
6

Conference

Conference2010 14th International Heat Transfer Conference, IHTC 14
国/地域United States
CityWashington, DC
Period10/8/810/8/13

ASJC Scopus subject areas

  • 流体および伝熱

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