首页|Heat transfer characteristics of PCM slurry using super-hydrophobic gel particles under laminar flow?,??
Heat transfer characteristics of PCM slurry using super-hydrophobic gel particles under laminar flow?,??
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NSTL
Elsevier
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.
Heat transferLatent heat transportationPCM slurryPhase change materialSuper-hydrophbic marshmallow-like gel
Hidema R.、Suzuki H.、Iwaya M.、Endo M.、Nishio N.、Otsubo T.、Miyata N.
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Department of Chemical Science and Engineering Kobe University
NSTL
Elsevier
