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An Effective Specific Heat Model of the Heat Transfer in a Micro-PCM Suspension in Laminar Tube Flow

[+] Author Affiliations
James C. Mulligan, Richard D. Gould

North Carolina State University, Raleigh, NC

Paper No. IMECE2002-39248, pp. 213-222; 10 pages
doi:10.1115/IMECE2002-39248
From:
  • 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

abstract

An “effective” specific heat model of the heat transfer in the thermal entry region of a laminar tube flow carrying a microPCM fluid is presented. The model is in an analytical format and intended to be easy to apply. It is based on classical Graetz theory, along with a computational analysis of entry region heat transfer that includes the latent effects contributed by a suspended microPCM. Generally, the Nusselt number of a microPCM fluid is shown to be of the following general form Nu = f(Gr, L, P), where Gr is the classical Graetz number, and L and P are Stefan-like parameters defined as: Fλ/Cp(Tl−Ts) and Cp(Ts−Tin)/(q/ṁ), respectively. Here F is the fraction of PCM in the suspension, λ the latent heat, and q/ the ratio of the system heat rate to the system flow rate.

Copyright © 2002 by ASME

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