Contact Melting Motion Driven by Pressure and Temperature Difference for Ice under a Sphere
Chen Wenzhen,Li Haofeng,Liu Zhen,Gao Ming,Sun Fengrui
(Department of Nuclear Energy Science and Engineering, Naval University of Engineering, Wuhan 430033，China)

Abstract：The contact melting processes of phase change material (the ice) under a sphere, which is driven by the temperature difference ΔT and press ure difference Δp, are investigated. Employed contact melting theory and the th ermal property of H₂O near the triple-point, the analysis formula of the liquid layer thickness and the integral equation of melting velocity at which the sphe re moves intoice block versus the force applied to the sphere during the melting, are obtained and discussed. It is found that the pressure melting velocity is lower than ΔT-driven melting velocity under the same equivalent temperature difference between the sphere surface and ice block, the results of the ΔT-driven contact melting cannot be obtained from that of Δp-driven contact melting by the substitution of equivalent temperature difference and vice versa; the results of the contact melting driven jointly by the pressure and temperature diffe rence cannot be obtained by the addition of those driven respectively by the pressure and temperature difference.
Keywords: contact melting, phase change phenomena, sphere.