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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

A STUDY OF THE TIME AND SPATIAL STRUCTURE OF HEAT TRANSFER PERFORMANCES NEAR THE REATTACHING POINT OF SEPARATED FLOWS

Get access (open in a dialog) DOI: 10.1615/IHTC8.550
pages 1083-1088

Resumo

An experimental study was made on separated and reattached flows behind a backward facing step to clarify time-mean and instantaneous heat transfer performances and their correlation near the reattaching point. Firstly, in order to investigate the time and spatial structure of flow field, a newly developed thermal tuft probe was installed for measuring the instantaneous velocity and its direction near the reattaching point. Thus, important data of the instantaneous flow performance were obtained and the time and spatial fluctuation characteristic of the reattaching point was found to have almost the normal distribution. Secondly, in order to make clear the effect of fluctuating motion on heat transfer performance near the reattaching point, several cases of controlling the fluctuating amplitude were investigated for their heat transfer performances. From the results, the instantaneous heat transfer distribution near the reattaching point was calculated by using the results about instantaneous flow characteristics and time-mean heat transfer performances in several cases of various fluctuating amplitudes. Finally, based on the instantaneous heat transfer performance thus obtained, the time-mean heat transfer performance near the reattaching point was calculated and found to be in good agreement with the experimental results.