Thermal analysis study on water freezing and supercooling |
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Authors: | K Nitsch |
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Institution: | (1) Institute of Physics AS CR, Cukrovarnická 10, 162 00 Praha 6, Czech Republic |
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Abstract: | Water freezing and supercooling were experimentally studied by methods of thermal analysis in a water droplet of 5 mm in diameter
depending on various temperatures and times of overheating and cooling rates. Degree of water supercooling was influenced
by previous thermal treatment but only to a certain extent. It increased slightly with overheating temperature and time and
decreased with cooling rate. Maximum found values of supercooling ranged between 12 and 13 K. Small degrees of supercooling
and their changes indicate that water freezing was more controlled by heterogeneous nucleation (properties of container contact
surface) than by previous thermal treatment and experimental conditions. |
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Keywords: | heterogeneous nucleation thermal analysis thermal treatment water freezing water supercooling |
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