Effect of the disturbance frequency and the boundary layer thickness on heat transfer in a flow over a cubic cavity

The results of the numerical modeling of heat transfer in flows over cubic cavities are presented. The effect of different parameters of the incident laminar flow, such as the disturbance frequency, the boundary layer thickness, and the main flow velocity, on the flow stability is investigated. It is shown that the integral heat flux considerably depends on the disturbance frequencies in the oncoming flow, the frequencies leading to heat transfer intensification being determined by the stability of the mixing layer between the cavity and the main flow. The calculated integral heat-transfer parameters are compared with experimental data. The calculated Reynolds-number dependence of the Nusselt number is found to be in good agreement with experiment.