Crystal Growth and Viscosity Behaviors of Ammonium Alum Hydrate Solution with PVA in Shear Flow

Toyoda, Takafumi; Hidema, Ruri; Suzuki, Hiroshi; Komoda, Yoshiyuki

doi:10.1678/rheology.42.219

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…These causes a sever accident of pipe blocking at room temperature after the system is shut down. Toyoda et al (2014a) reported the improvement of the adsorption characteristics of ammonium alum hydrates and Hidema et al(2014aHidema et al( , 2014b reported some additives can prevent the particle growth of ammonium alum hydrates. However, the particle growth depression technologies has not yet been completed.…”

Section: Latent Heat Transportationmentioning

confidence: 99%

Fabrication of hard-shell microcapsules containing inorganic materials

Tamaru

Suzuki

Hidema

et al. 2017

International Journal of Refrigeration

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The fabrication method of silica hard shell microcapsules containing disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4 ･12H 2 O) has been developed. The effects of the mixing rates for the emulsification, of the volume ratios of solutions and of surfactant concentrations on the size of hollow microcapsules have been also studied. From the results, it was confirmed that silica hard shell microcapsules can contains Na 2 HPO 4 ･12H 2 O with the present method using hollow microcapsules. The present micro-encapsulated Na 2 HPO 4 ･ 12H 2 O was also found to cause the supercooling depression effect. As the fabricated microcapsules have no flammability, the present microcapsule was concluded to be a promising item not only for latent heat transportation media but also for the static thermal storage materials for architectural structures. From the studies on the fabrication parameters, it was concluded that the control of the surfactant concentration is effective for controlling the size of microcapsule.

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Section: Latent Heat Transportationmentioning

confidence: 99%

Fabrication of hard-shell microcapsules containing inorganic materials

Tamaru

Suzuki

Hidema

et al. 2017

International Journal of Refrigeration

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“…In addition, Hidema et al reported that the combination of the cationic surfactant and PVA prevents sedimentation of the hydrate slurry . Toyoda et al reported that increase in shear rate and a hydrophilic surface prevents the crystal growth in the hydrate slurry . Moreover, Hidema et al showed that DR effect by the surfactant is not disturbed by PVA in a pipe flow of the hydrate slurry .…”

Section: Introductionmentioning

confidence: 99%

Pipe diameter effect on flow and heat transfer characteristics of ammonia alum hydrate slurries with additives

et al. 2019

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In this study, pipe diameter effect on flow and heat transfer characteristics of ammonia aluminium sulfate dodecahydrate (ammonia alum hydrate: AlNH 4 (SO 4) 2 Á12H 2 O) slurries with drag reducing surfactants and poly(vinyl alcohol) was investigated. Pressure loss and heat-transfer coefficients of ammonia alum hydrate solutions and slurries were measured with double-pipe heat exchangers with different inner tube diameters. Measurement results indicated that pseudo-laminarization by the surfactant caused drag-reduction effect and its saturated magnitude was affected by inner tube diameters. Pseudo-laminarization also produced heat transfer reduction effect and its magnitude was not affected by inner tube diameters. Calculation results of Colburn's j-factor divided by friction factors indicated that heat transportation efficiency of the hydrate solutions/slurries with additives was increased due to the contribution of drag-reduction effect.

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