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Journal of Enhanced Heat Transfer
Fator do impacto: 1.406 FI de cinco anos: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Imprimir: 1065-5131
ISSN On-line: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v10.i2.10
pages 119-130

Measurement of Condensate Film Thickness for Solutal Marangoni Condensation Applying Laser Extinction Method

Yoshio Utaka
Yokohama National University, Department of Mechanical Engineering, Tokyo Institute of Technology 2-12-1 0-okayama, Meguro-ku Tokyo 152 JAPAN; School of Mechanical Engineering, Tianjin University, 135 Ya Guan Rd. Tianjin Haihe Education Park, Jinnan District, Tianjin300350, China; Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, China
Tetsuji Nishikawa
Air Liquide Japan


During solutal Marangoni dropwise condensation of a water–ethanol vapor mixture, condensation was observed by a high-speed camera while condensate film thickness was measured by the laser light extinction method. Good correspondence was observed between the film thickness data and the observed condensate behaviors. Minimum condensate film thickness occurred immediately after a departing drop swept by and decreased with increasing initial drop distance in the steep increase region of the condensation characteristic curve. In the region of higher cooling intensity, both initial drop distance and minimum condensate thickness increased with cooling intensity. The smallest thickness of the condensate film was less than 1 μm. A close relationship was confirmed to exist among condensate film thickness, initial drop distance, and heat transfer characteristics.

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