Abstract
The freezing of water-salt (sodium chloride) solution on a vertical wall of a rectangular cavity has been studied experimentally. The influence of thermally and solutally driven natural convection on the freezing process has been examined. The spatial and temporal variations of the temperature in the solid, mush and liquid regions have been recorded. By selectively withdrawing liquid samples and in conjunction with a refractometer, the concentration variation has been studied. The thermosolutal convective flow strongly influenced the rate of freezing. Due to the continuous rejection of salt, a solutally stratified stable region developed at the bottom of the test cell. The thickness of this region increased with the progress of freezing and it was separated from the remaining bulk liquid, where convective flow was present, by a thin interface.
Zusammenfassung
Es wurde der Gefriervorgang einer Wasser-Salzlösung (H2O-NaCl) an der senkrechten Wand einer rechtekigen Kammer experimentell untersucht, und zwar unter dem Einfluß der durch Temperatur- und Konzentrationsunterschiede ausgelösten Freikonvektion. Die mitgeteilten Ergebnisse betreffen die räumlichen und zeitlichen Temperaturänderungen im Fest-, Misch- und Flüssigkeitsgebiet. Die Konzentrationsänderungen wurden durch selektive Entnahme von Flüssigkeitsproben in Verbindung mit refraktometrischen Messungen ermittelt. Das Gefriergeschehen hängt wesentlich von der durch Temperatur- und Konzentrationsunterschiede gesteuerten Konvektionsströmung ab. Infolge ständiger Anreicherung der Flüssigkeit mit Salz entwickelte sich eine konzentrationsstabilisierte Schicht am Boden der Versuchskammer, die mit zunehmender Eisbildung anwuchs und vom konvektiv beeinflußten Flüssigkeitsgebiet durch eine dünne Grenzschicht getrennt blieb.
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Chellaiah, S., Waters, R.A. & Zampino, M.A. Solidification of an aqueous salt solution in the presence of thermosolutal convection. Warme - Und Stoffubertragung 28, 205–216 (1993). https://doi.org/10.1007/BF01541191
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DOI: https://doi.org/10.1007/BF01541191