Effect of initial aqueous solution concentration on rheological behavior of ice slurry

Kumano, Hiroyuki; Yamanada, Yushi; Makino, Yuki; Asaoka, Tatsunori

doi:10.1016/j.ijrefrig.2016.04.022

Cited by 26 publications

(9 citation statements)

References 12 publications

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“…In previous studies, the onset nucleation time (beginning freezing time) [14,23,24], total freezing time (complete charging time) [14,16,17,[19][20][21]24,26,28,29], or half crystallization time [15,27] were applied to characterize the performance of nanofluid PCMs. For example, the ice packing factor of ice slurry is usually less than 50% [56][57][58] Moreover, reports showed that 50% mass of nanofluid PCM is solidified during 25% of total solidification time [19]. There are two reasons for choosing HFT to characterize the nanofluids.…”

Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

“…Second, aqueous PCM is usually not totally frozen in applications such as ice storage air-conditioning in order to maintain flow ability. For example, the ice packing factor of ice slurry is usually less than 50% [56][57][58] Moreover, reports showed that 50% mass of nanofluid PCM is solidified during 25% of total solidification time [19]. Thus, using the nanofluid PCM with 50% ice packing factor in order to achieve high efficiency of charging/discharging of the latent heat of the PCM is reasonable.…”

Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

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Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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Summary Nanofluids, particularly water‐based nanofluids, have been extensively studied as liquid–solid phase change materials (PCMs) for thermal energy storage (TES). In this study, nanofluids with aqueous ethylene glycol (EG) solution as the base fluid are proposed as a novel PCM for cold thermal energy storage. Nanofluids were prepared by dispersing 0.1–0.4 wt% TiO2 nanoparticles into 12, 22, and 34 vol.% EG solutions. The dispersion stability of the nanofluids was evaluated by Turbiscan Lab. The liquid–solid phase change characteristics of the nanofluids were also investigated. Phase change temperature (PCT), nucleation temperature, and half freezing time (HFT) were investigated in freezing experiments. Subcooling degree and HFT reduction were then calculated. Latent heat of solidification was measured using differential scanning calorimetry. Thermal conductivity was determined using the hot disk thermal constant analyzer. Experimental results show that the nanoparticles decreased the PCT of 34 vol.% EG solution but minimally influenced the PCT of 12 and 22 vol.% EG solutions. For all nanofluids, the nanoparticles decreased the subcooling degree, HFT, and latent heat but increased the thermal conductivity of the EG solutions. The mechanism of the improvement of the phase change characteristics and decrease in latent heat by the nanoparticles was discussed. The nanoparticles simultaneously served as nucleating agent that induced crystal nucleation and as impurities that disturbed the growth of water crystals in EG solution‐based nanofluids. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

Section: Subcooling Degree and Half Freezing Timementioning

confidence: 99%

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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“…The size of ice particles generally differs from 0.1 mm to 1.2 mm in diameter to facilitate storage in tanks. Effective thermo-physical properties are evaluated by directly weighing the corresponding properties of the carrier liquid (varies with the amount of additives and temperature) [7,8]. Ice concentration is used to restrict the Newtonian and non-Newtonian behaviour for ice slurry flow.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Fluidic Characteristics of Two-Phase Ice Slurry Flows Based on Comparative Numerical Methods

2019

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Ice slurry is a potential secondary refrigerant for commercial refrigeration systems because of its remarkable thermal properties. It is necessary to optimize the heat transfer process of ice slurry to reduce the energy consumption of the refrigeration system. Thus, this study investigates the heat transfer performance of single-phase (aqueous solution) and two-phase (ice slurry) refrigerants in a straight horizontal tube. The numerical simulations for ice slurry were performed with ice mass fraction ranging from 5% to 20%. The effects of flow velocity and ice concentration on the heat transfer coefficient were examined. The results showed that heat transfer coefficient of ice slurry is considerably higher than those of single-phase flow, particularly at high flow velocity and ice content, where increase in heat transfer with a factor of two was observed. The present results confirmed that ice slurry heat transfer ability is considerably affected by flow velocity and ice concentration in laminar range. Moreover, the second part of this paper reports on the credibility three distinct two-phase Eulerian–Eulerian models (volume of fluid (VOF), mixture, and Eulerian) for the experimental conditions reported in the literature. All two-phase models accurately predict the thermal field at low ice mass fraction but underestimate that at high ice mass fractions. Regardless of the thermal discrepancies, the Eulerian–Eulerian models provide quite reasonable estimation of pressure drop with reference to experimental data. The numerical predictions from the VOF model are more accordant with the experimental results and the maximum percentage error is limited to ~20% and ~13% for thermal and pressure drop predictions, respectively.

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“…A phase change material used for a latent heat transportation system is selected based on a temperature demanded in a system. Different types of latent heat slurries have been used in industries [1][2][3][4][5]. Ice/water slurries are one of the most common secondary refrigerants for low temperature [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature

Hidema

Tano

Sato

et al. 2018

International Journal of Heat and Mass Transfer

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Effect of initial aqueous solution concentration on rheological behavior of ice slurry

Cited by 26 publications

References 12 publications

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Thermo-Fluidic Characteristics of Two-Phase Ice Slurry Flows Based on Comparative Numerical Methods

Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature

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