This paper presents a method for deducing dimensionless heat transfer correlations in liquid metals for natural and forced convection conditions. This method was applied to liquid metals with different Prandtl numbers, namely, aluminum and steel. Solid spheres of aluminum and steel, initially at room temperature, were immersed into liquids of aluminum and steel, respectively. In the first set of tests the spheres were immersed under natural convection conditions, and in the second, under forced convection conditions. The melting time of the spheres was carefully monitored and it was related to the average heat flux from the metal bath to the immersed sphere.