干渉法を用いた水溶液凝固現象の微視的研究

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  • Study on Solidification of Aqueous Solution Using Laser Interferometry.
  • カンショウホウ オ モチイタ スイヨウエキ ギョウコ ゲンショウ ノ ビシテキ

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Solidification of an aqueous solution is studied using a laser interferometry technique combined with an optical microscope. In order to measure the concentration distribution in an aqueous NaCl solution near an ice crystal and three-dimensional shape of the ice crystal under a known temperature field, a directional solidification stage is used, which is composed of low-and high-temperature blocks and a moving bed. In this experiment ice crystals showed four shapes : flat, treelike, swordlike and needlelike. As a result of the interferometry experiment, it was observed that concentration increases in bulk solution for thick samples, swordlike ice crystal has an asymmetric triangular cross section, and that treelike crystal has a flat and low top. Also, ice formation response to injection of a high concenttration solution was studied.

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