Numerical simulation of the heat transfer characteristics of a U-shaped thermosyphon containing a PCM suspension

C. J. Ho, H. Y. Hsu, Fong Jou Tu, Chi Ming Lai

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1 Citation (Scopus)

Abstract

The present study investigates the heat transfer characteristics of a U-shaped vertical closed-loop thermosyphon filled with a phase change material (PCM) suspension using numerical simulation. The loop is made of a copper pipe (outer diameter/inner diameter = 1.46). The heating section and the cooling section are located at the bottom and top of the loop, respectively, and octadecane is used as the PCM. Parametric simulations were conducted using the pertinent physical parameters of a loop with a fixed geometrical configuration with the following parameter ranges: modified Rayleigh number Ra=5×103-5×105, modified Stefan number Ste=0.05-5, PCM suspension concentration fp = 0–10%, PCM particle dimensionless diameter Dp = 0.23–0.0023, and modified subcooling factor Sc=0.2-1.0. The results show that Ste presents a critical value under the given parametric conditions; when Ste is less than the critical value, the latent heat effect becomes significant, and the temperatures in the heating and adiabatic sections of the loop decrease considerably.

Original languageEnglish
Pages (from-to)1076-1085
Number of pages10
JournalApplied Thermal Engineering
Volume108
DOIs
Publication statusPublished - 2016 Sep 5

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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