Phase Separation Characteristics of Ammonium Alum Hydrates with Poly Vinyl Alcohol

Hidema, Ruri; Tano, Takuya; Suzuki, Hiroshi; Fujii, Makoto; Komoda, Yoshiyuki; Toyoda, Takafumi

doi:10.1252/jcej.13we085

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…In addition, the shear-thinning effect of the surfactants is not disturbed by the additional presence of PVA additives. 25) In our previous study, we confirmed that the slurry without surfactants showed a shear-thinning effect at low shear rates; however, the viscosity had already reached a 40 s -1 constant value.…”

Section: )supporting

confidence: 74%

“…In addition, a small amount of the slurry will be applied to a constant shear stress for a certain time during which the crystals in the slurry . According to our previous studies 24,25) , its fusion temperature is 51 ºC at a concentration of 35 wt% in water.…”

Section: )mentioning

confidence: 99%

“…In our previous study, we focused on the interaction between surfactants and PVA. 25) The PVA used in this study can form a network structure, which might be further entangled by surfactants. In another explanation for the effects of PVA, the Kelvin effect was proposed.…”

Section: Crystal Growth Characteristicsmentioning

confidence: 99%

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

Toyoda

Hidema

Suzuki

et al. 2014

J. Soc. Rheol., Jpn

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Section: )supporting

confidence: 74%

Section: )mentioning

confidence: 99%

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

Toyoda

Hidema

Suzuki

et al. 2014

J. Soc. Rheol., Jpn

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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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“…Suzuki et al demonstrated the DR effect on the hydrate slurry by adding a cationic surfactant . 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 .…”

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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Phase Separation Characteristics of Ammonium Alum Hydrates with Poly Vinyl Alcohol

Cited by 13 publications

References 17 publications

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

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

Fabrication of hard-shell microcapsules containing inorganic materials

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

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