Abstract
Very high turbulent fluctuation inherent in bubbling jet suppresses the separation of boundary layer developing on the surface of a body immersed in the jet and makes fluids in the bulk layer contact with it from all directions. Therefore, as the turbulence increases, the local heat transfer coefficient around the body is supposed to have almost the same value all over the surface and become independent of the shape of the body. This was found to be true from the facts that a rectangular ice prism melted away while keeping the similar profiles and that the local heat transfer coefficient was well approximated by the mean heat transfer coefficient of a sphere. On the basis of this result, the complete melting time of a rectangular prism was estimated by using the mean heat transfer coefficient of a sphere. The result agreed well with the experimental one. This agreement implies that the present estimation method would be applied to various non-spherical bodies immersed in bubbling jet
