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Investigation of heat transfer and rheology of a phase change material emulsion with a high concentration in surfactant.

Number: pap. 0025

Author(s) : VASILE V., BADEA A., NECULA H., et al.

Summary

The thermohydraulic characteristics of a secondary refrigerant consisting of a phase change material emulsion (PCME) were investigated. This PCME is a paraffin-in-water emulsion containing 30 wt.% of paraffin and a relatively high concentration of surfactant (5 wt.%). A fully instrumented 1 m long rectangular channel was used to conduct heat transfer experiments. Heat transfer coefficients during cooling inside the rectangular channel were determined. Furthermore, a specific test rig was used to perform experiments on the rheological behavior. Tests were carried out using a pipe viscosimeter at different temperatures for laminar flow. The stability of the emulsion was examined under thermal-mechanical loads. The experiments revealed a shear thinning behavior. Phase change of the PCM droplets was confirmed for high Reynolds number, while for low Reynolds number, the phase change remains uncertain. In addition, results showed a large supercooling degree and a very good stability but viscosity was found to be quite high.

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Pages: 190-197

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Details

  • Original title: Investigation of heat transfer and rheology of a phase change material emulsion with a high concentration in surfactant.
  • Record ID : 30023792
  • Languages: English
  • Source: 12th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Orford, Canada, May 21-23, 2018.
  • Publication date: 2018/05/21
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2018.0025

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