A numerical simulation validated experimentally for thermally developing convection characteristics of a phase change nanofluid flow in a circular tube

C. J. Ho, Yu Chao Chu, Z. P. Huang, T. S. Yang, T. C. Chiu, Bo Lin Chen, Wei Mon Yan

研究成果: Article同行評審

摘要

The present work aims to examine the heat transfer effectiveness of laminar forced convection for water-based Nano-PCM emulsion flow through a pipe. Over a finite length of the wall, the pipe is uniformly heated with a uniform heating flux. An approximate enthalpy model is employed for the formulation of the energy equation to present the phase-change process of the Nano-PCM emulsion. Efficiency of utilizing the water-based Nano-PCM emulsion to substitute its base fluid as the working fluid in a uniform heating pipe was then demarcated quantitatively for different dimensionless parameters including the mass concentration of the Nano-PCM particles, ωpcmp, and the modified Stefan number,Stebf. Predicted results show that the surface-averaged cooling efficiency of the nanofluid appears increasingly promoted with its Nano-PCM particle fraction under decreasingStebf. The local heat transfer coefficient can be improved more than 20 times as the phase change fluid with ωpcmp = 10% and Stebf = 0.01 is used. The local heat transfer improvement for the phase change nanofluid over the water is directly related to the mass fraction of Nano-PCM particle. The averaged heat transfer effectiveness of water-based Nano-PCM emulsion flow is considerably increased with its Nano-PCM particle fraction under decreasing Stebf.

原文English
文章編號100925
期刊Case Studies in Thermal Engineering
25
DOIs
出版狀態Published - 2021 六月

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Fluid Flow and Transfer Processes

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