Measurement of heat transfer coefficients for direct contact condensation in core makeup tanks using holographic interferometer

The present work is to improve our understanding and analysis of direct con tact condensation on the gravity injection of CMTs and to measure the heat transfer coefficients around steam bubbles using the holographic interferom eter and high speed camera. The condensation regime map associated with the downward injection of steam into water through the steam pipe is investiga ted to understand the mechanism of the direct contact condensation. The pre sent map shows that the boundary of chugging and subsonic jetting with the larger diameter pipe is shifted to the larger steam mass flux. Steam cavity mode, not found in the literature, and the unique mode of downward injecti on for the present geometry, is observed at the low subcooled water tempera ture. With the holographic interferometry and the high speed camera, the he at transfer mechanism for the direct contact condensation in CMTs is unders tood and the heat transfer coefficients are measured. (C) 2000 Elsevier Sci ence S.A. All rights reserved.