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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2013, Vol. 14 Issue (6): 427-434    DOI: 10.1631/jzus.A1300076
Energy Engineering     
Influence of compression-expansion effect on oscillating-flow heat transfer in a finned heat exchanger
Ke Tang, Juan Yu, Tao Jin, Zhi-hua Gan
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
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Abstract  Compression and expansion of a working gas due to the pressure oscillation of an oscillating flow can lead to a temperature variation of the working gas, which will affect the heat transfer in the oscillating flow. This study focuses on the impact of the compression-expansion effect, indicated by the pressure ratio, on the heat transfer in a finned heat exchanger under practical operating conditions of the ambient-temperature heat exchangers in Stirling-type pulse tube refrigerators. The experimental results summarized as the Nusselt number are presented for analysis. An increase in the pressure ratio can result in a marked rise in the Nusselt number, which indicates that the compression-expansion effect should be considered in characterizing the heat transfer of the oscillating flow, especially in the cases with a higher Valensi number and a lower maximum Reynolds number.

Key words： Heat transfer      Heat exchanger      Oscillating flow      Pressure ratio      Pulse tube refrigerator     
Received: 11 March 2013      Published: 03 June 2013
CLC:  TK124  
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Ke Tang, Juan Yu, Tao Jin, Zhi-hua Gan. Influence of compression-expansion effect on oscillating-flow heat transfer in a finned heat exchanger. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2013, 14(6): 427-434.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1300076     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2013/V14/I6/427

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