The experimental results for gravity-controlled condensation of ethanol and water vapor mixtures on a horizontal tube are presented. Dropwise, drop and streak, and ring wise condensations are observed for the ranges of ethanol vapor mass fraction W 1∞ >=0.2∼0.5, 0.5∼0.7 and 0.75∼0.8, respectively, while smooth-film condensation takes place for the ranges of W 1∞ =0∼0.2 and W 1∞ =0.8∼1. Previous theoritical results for the heat transfer coefficent by the present authors based on the two-phase boundary layer theory are valid for the case of smooth-film condensation, while 20 to 60% higher heat transfer coefficient values are obtained for the other cases.
|Number of pages||6|
|Journal||Transactions of the Japan Society of Mechanical Engineers Series B|
|Publication status||Published - Jan 1 1989|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering