Enhancement of Heat Transfer of Backward-Facing Step by Mist flow

概要

論文の詳細を見る
A mist flow which is an air flow with water-drop mixed may be suitable for rapid cooling. This paper shows how heat transfer was enhanced due to that the small quantity water-drop was vaporizing immediately near the heated wall, when the mist flow was spouted from entrance section of the channel.In the measurement of local heat transfer coefficients on a heating surface, the detailed temperature distribution was measured by using an infrared camera from an observation window. In the measurement of local temperature and humidity distribution, the detail of spatial temperature and humidity were also measured by using temperature and humidity sensor to observe the change of phase of mist. In this detail measurement result of temperature and humidity in the duct channel, the local heat transfer coefficient was increased at recirculation region, and reattachment region and downstream region of a backward-facing step. It was found that the relation between the situation of evaporation and enhancement of local heat transfer coefficients in the channel.