文档介绍：测量声场中树枝冰晶生长速度的新颖实验台
余德洋, 刘宝林
(上海理工大学,上海 200093)
摘要针对过冷溶液中树枝状冰晶生长速度的测量问题,设计开发了一套超声波冷却实验台装置。实验
台主要由超声波浴系统、样品盛放器、冷却系统、温度监测系统及图像采集系统组成。该实验装置能有效
控制超声场中树枝状冰晶的生长温度。文中利用该实验台研究了超声波对过冷溶液中树枝状冰晶生长速度
的影响,结果表明:超声波对树枝状冰晶的生长具有显著的抑制作用。
关键词树枝冰晶;生长速度;超声波;空化;超声波冷却实验台
Apparatus for measuring the growth velocity of dendritic ice in ultrasonic field
YU Deyang, LIU Baolin1, WANG Bochun
( 1 University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract In order to measure the growth velocity of dendritic ice in undercooled solution, a novel ultrasonic
cold stage was developed. The system consists of (1) Ultrasonic bath system, (2) Sample vessel, (3) Cooling
system, (4) Temperature acquisition system, and (5) Image collecting system. This allows the temperature of a
sample to be systematically controlled while it is subjected to simultaneous excitation with ultrasound. The effect
of ultrasonic waves on the growth of dendritic ice in sucrose solutions was investigated using the ultrasonic cold
stage device. The results show that the use of ultrasound could inhibit the growth of dendritic ice in sucrose
solutions.
Keywords dendritic ice; growth velocity; ultrasound; cavitation; ultrasonic cold stage
0 前言近来研究表明在水、溶液及金属液体等的结晶
过程中应用低频高功率超声波能够细化结晶产品中
食品、药品等的低温冻结保存过程中,液相水[2-5]
晶体粒径的大小。但超声影响结晶的作用机理尚
的结晶对冻结材料的低温损伤是影响保存品质的重[6]