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Heat Pipe Technology: Volume 1. Fundamentals and Experimental Studies

ISSN Print: 0-8493-9921-1

Performance Limitation in Closed Two-Phase Thermosyphons with Cross-Over Flow Separators

Abstract

In various industrial applications of closed two-phase thermosyphons, the counter-current flow limitation (CCFL) is the limiting factor for the thermosyphon performance. In this context, liquid-vapour flow separators can be of great importance, since they allow to shift the CCFL towards higher performances. Among the different separator designs that have been proposed, the cross-over separator is very promising; it allows perfect phase separation by guiding the counter-current liquid and vapour flows in separate channels. This paper illustrates the performance characteristics of a closed two-phase thermosyphon with installed cross-over separator. The results of visualization experiments are presented and a model for calculating the required minimum fill ratio is introduced.
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