4.7 Article

Unsteady conjugate mixed convection phase change of a power law non-Newtonian fluid in a square cavity

期刊

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 53, 期 15-16, 页码 3308-3318

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2010.02.044

关键词

Non-Newtonian fluid; Conjugate solidification/convection; Finite volume simulation; Heat transfer; Fluid dynamics; Pseudo plastic solidification; Otswald de Waele fluid; Finite volume simulation

资金

  1. CONICYT-Chile
  2. FONDECYT-Chile [1070186]

向作者/读者索取更多资源

Transient phase change of a power law non-Newtonian fluid inside an inner thin walled container caused by external mixed convection in a square cavity has been analyzed numerically. Air was chosen as external cooling fluid and modified non-Newtonian water as the phase change fluid. Fluid mechanics and conjugate convective heat transfer, described in terms of continuity, linear momentum and energy equations, were predicted by using the finite volume method. Solidification was treated in terms of a phase change function varying linearly with temperature. The effect of the external Reynolds number, for Re = 200 and 1000 on solidification was studied along the influence of the non-Newtonian power law index (n = 0.5, n = 1.0). Results for the time evolution of streamlines, isotherms and freezing curves are analyzed. The effect of the Reynolds number on streamlines of the external fluid is remarkable, principally near the region close to the internal water filled container. Differences between cooling and freezing times are found for Newtonian (n = 1.0) and non-Newtonian modified (n = 0.5) water. (C) 2010 Elsevier Ltd. All rights reserved.

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