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

Otsubo, Takumu; MIYATA, Naoki; Iwaya, Masao; Endo, Masaru; Nishio, Naotaka; Hidema, Ruri; Suzuki, Hiroshi

doi:10.1016/j.ijrefrig.2022.03.020

Cited by 2 publications

(2 citation statements)

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“…However, nano-emulsion systems are limited by stability issues. Otsubo et al 31,32) suggested a novel technique in which super-hydrophobic gel (marshmallow-like gel) particles that adsorb PCM paraffins were dispersed in water to form a more stable PCM slurry. Hayase et al 33) developed a marshmallow-like gel that is flexible, porous, and hydrophobic.…”

Section: Introductionmentioning

confidence: 99%

“…Due to these properties, the surface of the marshmallow-like gel could only adsorb hydrophobic substances. In previous reports, it was found that sodium carboxymethyl cellulose (CMC) efficiently promotes the dispersion of the marshmallow-like gel particles 31) and the heat transfer characteristics of the marshmallow-like gel slurry in laminar flow 32) were discussed. However, the dispersibility of marshmallow-like gel particles in the slurry and the flow characteristics of the marshmallow-like gel slurry have not been fully investigated.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and Flow Characteristics of Super-Hydrophobic Marshmallow-Like Gel Particles in CMC Solution for Latent Heat Transportation

Otsubo

Miyata

Iwaya

et al. 2023

J. Soc. Rheol., Jpn

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To utilize a super-hydrophobic tetradecane-adsorbed marshmallow-like gel as a phase-change material (PCM) as a carrier for latent heat transportation by mixing the gel particles with sodium carboxymethyl cellulose (CMC) solution, the dispersion characteristics and flow characteristics of a marshmallow-like gel slurry were investigated. To investigate the dispersion characteristics of the slurry, visual observation of the slurry under static conditions was performed while varying the concentration of CMC, and the apparent dispersion fraction was determined for quantifying dispersion characteristics. The apparent dispersion fraction stabilized within 2 h. At CMC concentrations of < 0.4, 0.6-2, and > 3 wt%, the apparent dispersion fraction increased, remained constant, and reached the complete dispersion state, respectively. At several concentrations, the viscosity of the liquid layer of the gel slurries was lower than that of the pure solution, coinciding with the range where the apparent dispersion fraction increased. Therefore, it was found that the adsorption of CMC onto the surface of marshmallow-like gel affects the dispersion characteristics of marshmallow-like gel slurry. To investigate flow characteristics, friction factor of CMC solution and marshmallow-like gel slurry against Reynolds number was measured. From the results, it was confirmed that the shear-thinning of the CMC solution affected the flow characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%