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Numerical Investigation of Turbulent Natural Convection in Symmetrically and Asymmetrically Heated Vertical Channels

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1990
pages 1946-1958

Vladimir V. Terekhov
Kutateladze Institute of Thermophysics SB RAS, Lavrentiev av., 1, Novosibirsk, 630090, Russia; Novosibirsk State University, Pirogov st., 2, Novosibirsk, 630090, Russia

Ali L. Ekaid
Lab. of Thermal and Gas Dynamics, Kutateladze Institute of Thermophysics Siberian Branch of Russian Academy of Sciences, 630090, 1, Acad. Lavrent'ev Avenue, Novosibirsk, Russia; Mechanical Engineering Department, University of Technology, Baghdad, Iraq

Resumo

The results of numerical studies of flow and heat transfer in turbulent free convection between isothermal vertical parallel plates with different temperatures have been presented. The temperature ratio is varied in the range (RT = −2 to 1). The Rayleigh number was varied in the range of Rayleigh (Ra = 107−109), and the ratio of the geometric dimensions of the plates and the distance between them was constant A=L/w =10. Numerical investigations were carried out by solving the two-dimensional equations of Navier-Stokes and energy equations in the Boussinesq approximation. The considered boundary problem has unknown conditions at the entrance and exit between the plates. To describe the turbulence the modified low Reynolds k - ε model has been used. The effect of temperature on the flow structure in the entrance and exit channel has been analyzed. The presented data on the distribution of velocity and temperature between the plates, the local and integral heat transfer allow a deeper understanding of the mechanism of transfer processes between parallel plates with asymmetric heating.

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