Forced Convection Heat Transfer with Microencapsulated Phase-Change-Material Slurries: Turbulent Flow in a Circular Tube.

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  • マイクロカプセル化相変化物質スラリーの強制対流熱伝達特性　　円管内乱流
  • マイクロカプセルカソウ ヘンカ ブッシツ スラリー ノ キョウセイ タイリュウ
  • Turbulent Flow in a Circular Tube
  • 円管内乱流

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Abstract

An experimental study using a slurry of micro-encapsulated phase change material (MCPCM) in water is conducted in order to investigate the increase in convection heat transfer coefficients of slurry flows as well as the increase in thermal capacity of a slurry by using the latent heat from a solid-liquid phase change material (PCM). Experiments were done for turbulent, hydrodynamically fully developed flows in a circular tube with constant wall heat flux. Local convective heat transfer coefficients were measured along the heating test section in order to study the effects of the melting phenomena inside MCPCMs. Experimental data are presented for various particle concentrations, slurry flow rates, and heating rates. Results show that an increase in the local convective heat transfer coefficient is found when the MCPCMs melted. Enhancement of heat transfer due to phase change is affected to varying degrees by Reynolds numbers of slurry flows, the fraction of PCM which is solid phase and heating rates. This paper provides and presents an explanation of the physical mechanism of the convective heat transfer enhancement due to the phase change of MCPCMs and a set of data available for the adjustments of system operating conditions for optimum heat transfer performance.

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