Cross flow boiling in tube bundles

This report contains two main subjects. One is the newly started investigation of cross flow boiling in tube bundles. The heat transfer information at this condition is of significant importance to horizontal steam generator design. The other one is the continuation of the research on boiling heat transfer in confined spaces. The research on cross flow boiling in tube bundles has been started. The Freon loop has been modified for higher flow and higher two phase quality. The test section design is finished and is under fabrication presently. The new instrumentation system is also established. The test matrix has been planned. The research on boiling in confined spaces proceeds steadily. This problem is of great importance to the boiling induced corrosion in the steam generator crevices between the tube and the support plate. In the report of 1981, detailed results were presented for analysis of single phase flow, two phase flow, and dryout in crevices. Experimental results of boiling and dryout in crevices with closed bottom were also reported. In this report of 1982, the results of forced convective boiling heat transfer and critical heat flux in crevices are presented. The status of research on boiling in horizontal crevices is also described here.