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传热学
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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

传热学

DOI: 10.1615/HeatTransRes.2016010434
pages 855-863

OBSERVATION OF HEAT TRANSFER IN OSCILLATING FLOW WITHIN A CIRCULAR CHANNEL

Ke Tang
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
Jiale Huang
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
Wentao Tang
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
Juan Yu
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
Tao Jin
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China

ABSTRACT

A periodical reversion of velocity direction distinguishes an oscillating flow from a common unidirectional steady flow. This study focuses on heat transfer in oscillating flow within a circular channel. An experimental apparatus operating at a frequency of 0.3-1.1 Hz and at a near atmospheric pressure has been built for measuring the heat transfer rate. Typical experimental data on the oscillating pressure, velocity, temperature difference (between the central fluid and the channel wall), on the heat flux at the channel wall are presented. A zero-order Nusselt number is used to characterize the time-averaged heat transfer of the oscillating flow. A marked increase in the zero-order Nusselt number with increase in the Peclet number is observed, which indicates that the raised frequency can effectively enhance heat transfer in oscillating flow.


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