In situ observation of the Marangoni convection in a NaCl aqueous solutions under microgravity

Gen Sazaki, Satoru Miyashita, Masaki Nokura, Toru Ujihara, Kozo Fujiwara, Noritaka Usami, Kazuo Nakajima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Using a drop experiment facility, Marangoni convection induced by a temperature gradient in a 7.35wt% NaCl aqueous solution was observed in situ under microgravity in order to reveal Marangoni effects on the crystallization from aqueous solution in a spaceship. In the drop experiment, after microgravity was achieved, the buoyant convection diminished completely within 1.0s. Since the flow rate became quite steady after 1.0s of microgravity, this was regarded as the flow rate of Marangoni convection. The flow rates of Marangoni convection were also measured as a function of the exposure time of the solution surface to the surrounding air. The flow rate decreased exponentially with an increase in the exposure time. This decrease could be explained by a model containing Langmuir type adsorption of the air on the solution surface. Our result suggests that the solution surface would be entirely contaminated by the adsorbed gas molecules within several hours, and Marangoni convection would diminish.

Original languageEnglish
Pages (from-to)516-522
Number of pages7
JournalJournal of Crystal Growth
Volume234
Issue number2-3
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • A1. Fluid flows
  • A2. Microgravity conditions
  • B1. Proteins
  • B1. Sodium chloride

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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