B111 Study on Mechanism of Condensation Heat Transfer of Water Jet in Steam Injector : Relation between Waves on the jet Surface and Heat Transfer

Abstract

Characteristics of a steam injector and steam condensation phenomena on water jet surface in the steam injector were experimentally examined. In visual experiments of behavior of the water jet in the steam injector, many large waves were observed on the water jet surface. The waves showed the tendency to grow as those proceeded downstream. Direct steam condensation on to the water jet surface in the steam injector was mainly controlled by radial heat transport in the water jet. The radial heat transport in the water jet was considerably more effective than that in the usual turbulent heat transport in a pipe. It was pointed out that this highly effective radial heat transport mechanism was created by local circulation in the water jet that was produced by waves on the water jet surface. Waves on the jet surface ware examined. Based on it, the heat transfer correlation of the jet flow accompanying the direct condensation of steam on the surface was proposed.