抄録
An experimental study was performed on free convection heat transfer in a stably stratified fluid between coaxial cylinders. The stratified layer was formed using a sucrose aqueous solution, and was heated from the outer cylinder at constant heat flux and cooled from the inner cylinder at constant temperature. The experimental results showed that the heat transfer in a stratified fluid is quite different from that in a non-stratified fluid. The effects of stratification appeared conspicuously in the lower part of the fluid, where the stratified layer prevents large-scale convection but instead generates a lot of small convection cells. The marked decline of the heat transfer coefficient in a stratified fluid results primarily from those characteristics in the lower part of the fluid.
