Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom.
Phys Rev Lett. 2011 Dec 16;107(25):258001. doi: 10.1103/PhysRevLett.107.258001. Epub 2011 Dec 15.
This Letter describes an investigation of interfacial melting in ice-bearing granular flows. It is proposed that energy associated with granular collisions causes melting at an ice particle's surface, which can thus occur at temperatures well below freezing. A laboratory experiment has been designed that allows quantification of this process and its effect on the dynamics of a granular shear flow of ice spheres. This experiment employs a rotating drum, half filled with ice particles, situated in a temperature controlled laboratory. Capillary forces between the wetted melted particle surfaces lead to the clumping of particles and enhanced flow speeds, in turn leading to further melting. Dimensional analysis defines a parameter space for further experimentation.
这封信描述了对含冰粒状流中界面熔化的研究。有人提出，颗粒碰撞所产生的能量会导致冰颗粒表面的熔化，从而使熔化发生在远低于冰点的温度下。为此设计了一项实验室实验，以量化这一过程及其对冰球粒状剪切流动力学的影响。该实验采用了一个装有一半冰粒的旋转鼓，置于温度可控的实验室中。润湿融化的颗粒表面之间的毛细力导致颗粒团聚和流速增加，进而导致进一步的熔化。因次分析为进一步的实验确定了参数空间。
