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NUMERICAL STUDY OF PERIODICALLY FULLY-DEVELOPED FLOW AND HEAT TRANSFER IN CHANNELS WITH PERIODIC SEMI-CIRCULAR TUBE

Weiyu Zhang, Mo Yang, Yuwen Zhang
Frontiers in Heat and Mass Transfer (FHMT) 12 - 18 (2019)


Abstract


The periodically fully-developed flow and heat transfer in channels with periodic semi-circular tube is studied numerically by the DNS, the LES and the RSM. When the Reynolds number is between 3000 and 25000, the Nusselt number obtained by the RSM is closer to the experimental results than the results obtained from other turbulent models. The mechanism of the nonlinear characteristics of flow and heat transfer is revealed based on the results of numerical simulation. When Reynolds number is high, the geometric structure and boundary conditions of the channel are symmetric, but the flow field in the channel is asymmetric. With the increase of Reynolds number, the flow and heat transfer in channels experiences steady state, periodic oscillations, and finally chaos. Moreover, Nusselt number increases gradually with the decrease of tube spacing at the same Reynolds number. In all cases considered in this paper, the maximum Nusselt number is 15.22 times of the minimum Nusselt number. 

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DOI: http://dx.doi.org/10.5098/hmt.12.18

ISSN: 2151-8629