A STUDY OF WATER FREEZING
A liquid is expected to freeze when reaches its freezing point. Water freezes at 0℃ at atmospheric pressure, however there are circumstances in which phase change does not occur, although liquid temperature is below its freezing point. This condition is referred to as supercooling. Supercooling occurs when water molecules do not find any nucleation sites to form ice molecules. The parameters that influence supercooling of water include freezer temperature, rate of heat transfer, and geometry of container, water initial temperature and the amount of dissolved gases in it. In the present study, water with initial temperature of 20℃ is put at different freezer temperatures and its probability to supercool has been studied. It is observed that water is most probable to experience supercooling in freezer temperatures between 0 and -8℃. This implies that there are not enough nucleation sites present to initiate freezing at these temperatures. However, at freezer temperature between -8 and -10℃ nucleation was random and at freezer temperatures lower than -12℃ nucleation always happened and supercooling was never observed. This indicates that there were enough nucleation sites to initiate freezing at these freezer temperatures.
Reza Hosseini Amir Gholaminejad
Mechanical Engineering Department Amirkabir University of Technology 424 Hafez Ave., Tehran, Iran, 1 Aerospace Engineering Department Amirkabir University of Technology 424 Hafez Ave., Tehran, Iran, 15
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
1060-1063
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）