EXPERIMENTAL AND ANALYTICAL STUDY OF NATURAL CONVECTION HEAT TRANSFER OF INTERNALLY HEATED FLUIDS
Boundary heat transfer from a liquid pool with a uniform internal heat source to vertical and inclined boundaries was investigated both analytically and experimentally. The experiments were performed in an open rectangular liquid pool in which the internal heat source was generated by resistance heating of an aqueous solution. The local heat flux was measured to a boron nitride test wall which was able to be inclined from the vertical. Thus, the local heat transfer coefficient could be measured at nineteen locations along the vertical axis of the test plate.
The local and average heat transfer data were empirically correlated by the relations
Nu(x) = 0.153 Ra(x)0.25and Nu = 0.127 Ra(L)0.25
The component of the gravitational acceleration along the wall, geff = 9 cos θ, was found to help account for the inclination of the boundary although some systematic effect was still evident.