Campbell James M, Sandnes Bjørnar, Flekkøy Eirik G, Måløy Knut Jørgen
PoreLab, the Njord Center, Department of Physics, University of Oslo, N-0316 Oslo, Norway.
College of Engineering, Swansea University, Crymlyn Burrows, Swansea SA1 8EN, U.K.
Cryst Growth Des. 2022 Apr 6;22(4):2433-2440. doi: 10.1021/acs.cgd.1c01488. Epub 2022 Mar 14.
We use high-speed photography to observe the dendritic freezing of ice between two closely spaced parallel plates. Measuring the propagation speeds of dendrites, we investigate whether there is a confinement-induced thermal influence upon the speed beyond that provided by a single surface. Plates of thermally insulating plastic and moderately thermally conductive glass are used alone and in combination, at temperatures between -10.6 and -4.8 °C, with separations between 17 and 135 μm wide. No effect of confinement was detected for propagation on glass surfaces, but a possible slowing of propagation speed was seen between insulating plates. The pattern of dendritic growth was also studied, with a change from curving to straight dendrites being strongly associated with a switch from a glass to a plastic substrate.
我们使用高速摄影来观察两块紧密间隔的平行板之间冰的枝晶冻结过程。通过测量枝晶的生长速度，我们研究是否存在除单个表面所产生的热影响之外，由限制条件引起的对速度的热影响。单独使用以及组合使用隔热塑料板和具有适度导热性的玻璃板，温度范围在-10.6至-4.8°C之间，间距在17至135μm之间。在玻璃表面上未检测到限制条件对生长速度的影响，但在隔热板之间观察到生长速度可能会减慢。我们还研究了枝晶生长的模式，从弯曲枝晶到直枝晶的变化与从玻璃基底到塑料基底的转变密切相关。
