TED-AJ03-412 COMPARISON OF VARIOUS KINDS OF EXTERNAL FORCES AFFECTING THE FREEZING OF SUPERCOOLED WATER

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概要

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• In order to clarify the effects on freezing of supercooled water, experiments to apply various kinds of external forces were carried out. Four cases of external forces were selected as shown in Fig. A-1 : a case of electric charge, a case of collision, a case of ultrasonic waves and a case of shock waves. In the apparatus of electric charge, two electrodes were facing to each other in supercooled water. Electric charge was applied to electrodes at the experiments. In the case of collision, a glass bar was dipped in supercooled water in a test tube and collided to the inner wall of the tube. In the case of ultrasonic waves, ultrasonic waves were applied to the water sample from underneath of the tube. In the case of applying shock waves, supercooled water was covered with oil in a syringe, and a piston of the syringe was lifted up and then released so that it fell down to the top surface of the oil and the water sample received impacts. For each external force, water sample was kept in a vessel and cooled down at a constant cooling rate. When the water sample was maintained under a supercooling state, an external force was applied to the water sample. The degree of supercooling was measured continuously. Then the degree of supercooling at freezing was determined. The comparison between four cases was carried out based on the degree of supercooling at freezing. It was found that all cases of external forces had effects on freezing of supercooled water. Especially, external forces of ultrasonic waves and shock waves were most effective. On the other hand, in the case without applying waves, the degree of supercooling at freezing was high. The effects of electric charge were depended on electric current. The probability of freezing was arranged with electric current. Although the external force by collision had a merit that the apparatus was simple, the degree of supercooling at freezing was relatively high.[figure]

• 一般社団法人日本機械学会の論文

著者

• Okawa Seiji

  Graduate School Of Science And Engineering Tokyo Institute Of Technology

• HOZUMI Tsutomu

  Graduate School of Science and Engineering, Tokyo Institute of Technology

• SAITO Akio

  Graduate School of Science and Engineering Tokyo Institute of Technology

• Hozumi Tsutomu

  Graduate School Of Science And Engineering Tokyo Institute Of Technology

関連論文

• TED-AJ03-412 COMPARISON OF VARIOUS KINDS OF EXTERNAL FORCES AFFECTING THE FREEZING OF SUPERCOOLED WATER

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