Abstract
A variety of ways to enhance the heat exchange have been proposed and investigated. We have developed a new-type heat exchanger by means of rotating a heat transfer pipe, which attained a high overall heat transfer rate. The heat transfer mechanism of the high-performance exchanger has been investigated based on the flow structure by flow prediction studies. This pipe-rotating heat exchanger system increases the coefficients of heat transfer of both the heating fluid and the heated fluid. By inserting stationary blades near the pipe wall surface, vortex flow is formed. The flow structure of the inner pipe changes with the pipe rotation speed. The vortex flows caused by the inner pipe rotation and the blades enhance the heat transfer not only in the inner pipe but also in the outer pipe.
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