摘要
分析了圆球下的冰在压力与温差共同作用下产生的熔化过程。利用接触熔化理论和水在三相点附近熔点随压力增加而降低的热物性,求得熔化边界层厚度的表达式、作用力与熔化速度关系所应满足的基本方程,由此可推导得温差和压力单独作用下的接触熔化结果。通过分析讨论发现,1)在压力产生的相同温差条件下,球的压力熔化速度要小于温差驱动接触熔化的速度。温差与压力单独驱动下的各自熔化结果,不能通过温度替换来得到。2)混合驱动下的接触熔化结果不是温差与压力熔化各自结果的叠加。
The contact melting processes of phase change material (the ice) under a sphere, which is driven by the temperature difference ΔT and pressure difference Δp, are investigated. Employed contact melting theory and the thermal 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 sphere moves into ice 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, die 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 difference cannot be obtained by the addition of those driven respectively by the pressure and temperature difference.
出处
《应用力学学报》
EI
CAS
CSCD
北大核心
2005年第3期356-358,共3页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(No.50376074)
关键词
接触熔化
相变现象
圆球
contact melting,phase change phenomena,sphere.
