摘要
为了探讨超声波强化冰晶二次成核的机理,利用自行研制的超声波冷却实验台,研究了超声波对未脱气蔗糖稀溶液和脱气蔗糖稀溶液中树枝状冰晶体的影响。实验结果表明:未脱气蔗糖稀溶液中的树枝状冰晶体受超声波辐射2s后已发生分裂,而脱气溶液中的树枝状冰晶体受功率相同的超声波辐射6s后却仍未分裂。说明超声场中冰晶发生分裂的主要原因是空化效应,而不是超声波在溶液中传播所引起的声压。
In order to clarify the mechanism of secondary nucleation of iceinduced by ultrasound, experiments on ice crystals in degassed sucrose solutions and untreated solutions have been carried out using a novel ultrasonic cold stage device. For each experiment, the ultrasonic waves operated at a power output of 120W. The results show that the ice dendrite crystals growing in a sucrose solution can be broken up into smaller fragments when ultrasound was applied for 2 s, but the pre-existing ice dendrite crystals in a degassed sucrose solution are still unbroken when ultrasound was applied for 6 s. These findings confirm that cavitation induced by ultrasound is a major factor for the fragmentation of ice crystals.
出处
《制冷学报》
CAS
CSCD
北大核心
2011年第6期30-34,共5页
Journal of Refrigeration
基金
上海市东方学者计划、上海市重点学科项目(S30503)
上海市研究生创新基金（JWCXSL1001)资助
关键词
热工学
晶核生成
超声波
空化
冰
溶液
Pyrology
Nucleation
Ultrasound
Cavitation
Ice
Solution
作者简介
刘宝林，男（1968-），博士生导师、教授。上海理工大学医疗器械与食品学院院长，上海市军工路516号，生物系统热科学研究所，200093，021—55271180，E-mail：blliuk@163．com。研究方向：低温冷冻技术和设备。
