Author： Bae Jun Ho Hyun Jae Min Kwak Ho Sang
Publisher： Taylor & Francis Ltd
ISSN： 1521-0634
Source： Numerical Heat Transfer Part A: Applications, Vol.39, Iss.7, 2001-05, pp. : 723-736
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
A numerical study is made of buoyant convection at high Rayleigh number in a square cavity that contains a horizontal baffle at midheight. The horizontal walls of the cavity are insulated. At the cold left vertical wall, the nondimensional temperature is constant = 0, and at the hot right vertical wall, the wall temperature is time periodic, = 1 + sin. Numerical solutions to the Navier-Stokes equations are secured. The length of the baffle is such that, in the basic state ( = 0), the baffle does not touch the vertical boundary layers. The flow and temperature characteristics of the basic state remain largely unaffected by the presence of the baffle. For the oscillating cases ( ≠ 0), the amplitude of fluctuating heat transfer rate across the cavity centerline is substantially reduced by the presence of the baffle. These changes in fluctuating flow characteristics are influenced appreciably by the thermal conductivity and the vertical location of the baffle. The oscillating flow and thermal fields are seen to be confined to the upper interior region between the top wall of cavity and the baffle. Sequential pictures are obtained of the evolutionary process of the disturbances. The physical interpretations, together with the prediction of the resonance frequency, are consistent with Kwak and Hyun's earlier argument.
Related content
Access to resources
Recommend
