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Heat transfer characteristics of PCM slurry using super-hydrophobic gel particles under laminar flow.

Author(s) : OTSUBO T., MIYATA N., IWAYA M., ENDO M., NISHIO N., HIDEMA R., SUZUKI H.

Type of article: IJR article

Summary

To prevent hydrophobic phase change materials (PCMs) from phase separation in water, a novel technique based on a super-hydrophobic gel, known as marshmallow-like gel, has been suggested as an effective solution. In this study, marshmallow-like gel particles, which only adsorb hydrophobic substances, were used as a carrier of a hydrophobic PCM (paraffin) to evaluate their heat transportation performance. The tetradecane-adsorbed marshmallow-like gel particles showed a latent heat of 123 kJ·kg–1, which is 56% of that of pure tetradecane (219 kJ·kg–1). Sodium carboxymethyl cellulose (CMC) was used as a dispersant for the superhydrophobic gel in water. An aqueous soliton of CMC (0.6 wt%) was used to prepare the slurry containing 10 wt% of tetradecane-adsorbed marshmallow-like gel particles. The heat transfer of the slurry under laminar flow was characterized, and experiments were performed in a homemade heat transfer apparatus based on a double-tube heat exchanger with an inner tube diameter of 8 mm. The heat transfer coefficient was compared with the results of the CMC solution without the particles. Due to the latent heat of tetradecane, the particles with hydrophobic PCM showed a positive effect on heat transfer characteristics. Additionally, an adequate model to describe the heat transfer under laminar flow was proposed using a modified Prandtl number to consider the effect of latent heat.

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Pages: 23-30

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Details

  • Original title: Heat transfer characteristics of PCM slurry using super-hydrophobic gel particles under laminar flow.
  • Record ID : 30029610
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 138
  • Publication date: 2022/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.03.020
  • Document available for consultation in the library of the IIR headquarters only.

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