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Performance of an Octacosane Based MicroPCM Fluid in Transitional Flow

[+] Author Affiliations
Richard D. Gould, Willard B. Jackson, III, James C. Mulligan

North Carolina State University, Raleigh, NC

Paper No. IMECE2002-39249, pp. 223-230; 8 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 7
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3638-X | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


Use of microencapsulated phase change material (microPCM) in a single phase carrier of fluid for enhanced cooling has been demonstrated by many researchers for the case of laminar flow. However, very little is known about the behavior of microPCM fluids for turbulent flows. Here we consider the flow of octacosane microPCMs in a 50/50 by volume ethylene glycol/water carrier fluid. This high temperature microPCM fluid, with Tmelt = 60°C, has a much lower viscosity than room temperature microPCM fluids. Room temperature microPCMs in 50/50 by weight ethylene glycol/water carrier fluid generally operate at Reynolds numbers much below the critical value due to their large viscosity and the unreasonably large pumping power required to produce turbulent flow. At 60°C, however, the flow can become transitional and perhaps fully turbulent with moderate pressure rise pumps. This paper presents the performance of an octacosane based microPCM fluid operating in the transitional region at Reynolds numbers up to 2900. Transitional flow convective heat transfer coefficients are shown to be as much as 50% higher than laminar flow values. In addition, surface temperatures are reduced with increasing Reynolds number.

Copyright © 2002 by ASME



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