1989 Fiscal Year Final Research Report Summary

Behavior of Condensate and Heat Transfer on a Rotary Horizontal Tube under Dropwise Condensation

Research Project

Project/Area Number	63550172
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Thermal engineering
Research Institution	HIMEJI INSTITUTE OF TECHNOLOGY
Principal Investigator	HOSOKAWA Yoshinobu Himeji Institute of Technology, Engineering, Professor, 工学部, 教授 (00047565)
Co-Investigator(Kenkyū-buntansha)	HOSOKAWA Tsutomu Himeji Institute of Technology, Engineering, Lecturer, 工学部, 講師 (00047630)
Project Period (FY)	1988 – 1989
Keywords	Phase change / Dropwise condensation / Rotary horizontal tube / Condensate behavior / Heat transfer
Research Abstract	In dropwise condensation heat transfer,it is known that condensate on a condensing surface cause two significant effects,i.e., sweeping and covering effects. In this study, the correlation between the behavior of condensate and the heat transfer on a rotary condensing tube was investigated theoretically and experimentally. The behavior of condensate on the rotary tube was extremely complex. And thus, the authors proposed the essential model for calculating the behavior of condensing drops and estimated the sweeping and covering effects on the heat transfer. It was found that, in rotating a condensing tube, a sweeping action was increased and covering action was decreased with a rotation number. Therefore, the possibility of the enhancement of the heat transfer was shown by this investigation on the rotary tube under dropwise condensation.

(6 results)