G0600-2-1 Fluid Flow and Heat Transfer of Natural Convection around V-shaped Heated Cavity

Abstract

Fluid flow and heat transfer characteristics of the natural convection induced over a V-shaped open cavity were investigated experimentally. The main concerns were directed to the influence of the open angles of the cavity θ. The angle was varied systematically from 90° to 180°. The flows in the cavity and the surface temperatures were visualized with fine particles and liquid crystal thermometry, respectively. The results showed that the ambient fluid descends to the center of the cavity, and then generates a pair of vortices in the cavity when θ<130°. The local heat transfer coefficients from the cavity were also measured. The results showed that the heat transfer is enhanced markedly when θ=120°, and the overall heat transfer coefficient from the cavity θ=120° became 17% higher than that from the horizontal plate.