| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 97 === In order to investigate the heat transfer phenomena in a U-shaped channel with reciprocating motion, an experimental work is conducted and validated by an auxiliary computational procedure simultaneously. The experimental apparatus consist of three parts, a cooling channel, reciprocating mechanism and heating control. The working fluid is air and the parameters of Reynolds number , temperature and oscillating frequency are varied. In addition, a flow visualization using the Smoke-wire method is adopted to indicate the flow field and compared with the streamline of the numerical results. The comparisons between experimental and numerical results are consistent well. The results show that the heat transfer rate is mainly dominated by nature convection effect, and less affected by increasing the low oscillating frequency and Reynolds number. The enhancement of the heat transfer is confirmed and within 51% in this study. In general , the aid of mixed convection is to remove more heat than force convection.
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