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Indexed by:会议论文

Date of Publication:2010-01-01

Included Journals:CPCI-S

Volume:1207

Page Number:525-530

Key Words:Coated division tube; Interface effect; Wavy liquid film; Infrared thermograph

Abstract:A specific coating was sprayed on the external surface of brass tube with design surface division form. The characteristics of heated liquid films flowing over a vertical coated division tube were experimentally investigated with a highly sensitive infrared camera, THERMOVISION (TM) A40. For different flow conditions, the temperature fluctuation and the flow patterns of falling film were determined. It was found that the temperature fluctuation on the coated division tube was larger than that on the smooth tube. The disturbance of falling liquid film was strengthened from the existence of a surface tension gradient that was induced by the coated region, resulting in stronger mixing occurred and drove the liquid particles from internal of liquid film to surface. The interfacial effect could therefore strongly affect the flow characteristic and thus the transfer process of falling liquid films.