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The International Conference on Multiphase Systems, ICMS'2000
Ufa, RUSSIA, June 15-17, 2000

Direct Numerical Simulation of Heat Transfer in Turbulent Open-Channel Flows

Yamamoto Y., Kunugi T. and Serizawa A.

Department of Nuclear Engineering Kyoto University, Kyoto, JAPAN

In the present study, turbulent heat transfer in open-channel flows has been numerically investigated by means of a Direct Numerical Simulations (DNSs) with a constant temperature at the free surface and the bottom wall. The DNSs were conducted for two Prandtl number, 1.0 and 5.0 with a neutral (i.e., zero gravity) or stable stratification of a passive scalar (Richardson number; 27.6), while a Reynolds number of 200, based on the friction velocity and flow depth. As the results, the coherent turbulent structures of fluid motion and thermal mixing, and the influence of Pr change for heat transfer, buoyancy effect for turbulent structures and hear transfer, and relationship among them, are revealed and discussed.