Impact of Cavity Aspect Ratio on Natural Convection Heat Loss of a Solar Receiver for High-Temperature Dish System
A 3-D numerical study has been carried out to uncover the influence of cavity aspect ratio on natural convection heat loss of a solar receiver for high-temperature dish system, accounting for air property variation with temperature. Temperature and velocity contours as well as the variation of the natural convection heat loss with the cavity aspect ratio have been well presented and discussed. It is revealed that the expansion of convection zone together with the augmentation of velocity magnitude result in the increment of natural convection heat loss with decreasing aspect ratio, i.e., with shallower cavity, especially when the cavity aspect ratio larger than 1. Therefore, the solar receiver with much too shallow cavity should be avoided in design.
S. Y. Wu et al., "Impact of Cavity Aspect Ratio on Natural Convection Heat Loss of a Solar Receiver for High-Temperature Dish System", Advanced Materials Research, Vols. 268-270, pp. 214-218, 2011