Evaluation of bubble suspension behavior in electrolyte melts

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• 作者：Minseong Kim (1)
  Kangwook Kim (1)
  Munkyeong Hwang (1)
  Kyubo Kim (2)
  Juhun Song (1)
  
• 关键词：Direct Coal Fuel Cell (DCFC) ; Electrolyte Melt ; Viscosity ; Bubble Suspension ; Volume Fraction
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：31
• 期：2
• 页码：201-210
• 全文大小：727 KB
• 作者单位：Minseong Kim (1)
  Kangwook Kim (1)
  Munkyeong Hwang (1)
  Kyubo Kim (2)
  Juhun Song (1)
  
  1. School of Mechanical Engineering, Pusan National University, 609-735, Pusan, Korea
  2. Pusan Clean Coal Center, Pusan National University, Pusan, 609-735, Korea
  
• ISSN：1975-7220

文摘

The viscosity of a molten electrolyte mixture commonly used in direct coal fuel cells (DCFCs) was evaluated. The measurements were obtained from near the melting temperature to a high temperature at which a considerably bubbly flow was induced by decomposition. A gravity-driven capillary viscometer was employed to obtain the viscosity data under low Reynolds flow conditions, using a modified Poiseuille flow relationship. The importance of carbon dioxide addition in measuring the intrinsic viscosity was clearly observed. In addition, the effect of the bubble suspension on the viscosity was quantified in terms of the volume fraction and capillary number. The results showed that the increase in viscosity was best explained only by the difference in the volume fraction of spherical bubbles in the electrolyte melt.