Numerical investigation of isothermal and non-isothermal ice slurry flow in horizontal elliptical pipes

Yadav, Sateesh Kumar; Ziyad, Devshibhai; Kumar, Arvind

doi:10.1016/j.ijrefrig.2018.10.013

Cited by 21 publications

(3 citation statements)

References 34 publications

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“…It has been widely applied in various fields, such as ice storage air conditioning, food storage, and mine cooling . At present, the research on binary ice mainly focuses on the characteristics of fluid flow and heat transfer . However, developing reliable, energy‐efficient, and cost‐effective binary ice generator remains a critical issue.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on titanium dioxide nanofluid in vacuum flash evaporation

2020

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This study is purposed to conduct experimental investigation into the characteristics of vacuum flash evaporation with nanofluid under adsorption conditions, with the effects of nanoparticle concentration, surfactant concentration, and nanofluid stability taken into consideration. By measuring absorbency, solute concentration, and sedimentation graph, a new nanofluid with excellent dispersion was developed for the vacuum ice-making system. It has been demonstrated that the low concentration of additive is conductive to not only the maintenance of vacuum but also the generation of binary ice. For nanofluid, there are two distinct freezing stages in the process of vacuum flash evaporation. The supercooling stage of nanofluid is delayed with the increase of surfactant concentration, whereas the TiO 2 nanofluid applied to the vacuum icemaking system under adsorption shows stability. Moreover, it is indicated that, for the vacuum ice-making system with TiO 2 nanofluid, the pH level is around 8.5, the surfactant is sodium dodecyl benzene sulfonate-span 60 (SDBS-SPAN), the ratio of SDBS to SPAN is about 10:7, the concentration of TiO 2 nanoparticle is around 0.20 wt%, and the ratio of TiO 2 nanoparticle to SDBS-SPAN is about 10:5. Compared with pure water, undercooling is reduced by 77.92%; the ice packing factor and thermal conductivity are increased by 40.61% and 67.27%, respectively. The results of test and analysis can be applied to conduct further research on vacuum flash evaporation. K E Y W O R D S adsorption, binary ice, flash evaporation, nanofluid, vacuum

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Section: Introductionmentioning

confidence: 99%

Experimental research on titanium dioxide nanofluid in vacuum flash evaporation

2020

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“…Others established the numerical transportation model for particle sizes between 0.1 mm and 20 mm in the pipeline system based on fluid dynamics, coupled with the discrete element methods, and quantitatively extracted the data, such as particle velocity, distribution region, solid phase volume fraction, and pressure loss of the pipeline [11][12][13][14][15]. The melting phenomenon of ice slurry in the pipe, the mixing effect of solid particles in the viscous liquid, the mechanism of jigging separation of mineral particles, and the cleaning process of non-spherical solid particles in the well hole with the help of a numerical simulation have been investigated [16][17][18][19]. By comparison, the numerical method has unique advantages in some respects, such as model accuracy, applicability, completeness, and cost, hence it is suitable for researching particle transportation in a complex pipeline structure.…”

Section: Introductionmentioning

confidence: 99%

Ballast Flow Characteristics of Discharging Pipeline in Shield Slurry System

et al. 2019

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We adopted two-way coupling of discrete and finite elements to examine the non-spherical ballast flow characteristics in a slurry pipe system during a shield project. In the study, we considered the slurry rheological property and the flake shape of the ballast. A ballast size between 17 and 32 mm under different slurry flow rates and ballast volumetric concentration conditions was investigated for determining the law through which the mass flow rate, detained mass percentage, and ballast distribution state are influenced. The results indicate that increasing slurry flow rate and the ballast volumetric concentration increase the mass flow rate; the influence of the latter is stronger. Increases in both in the slurry flow rate and the ballast volumetric concentration can reduce the detained mass percentage in the slurry discharging pipeline, whereas increasing the ballast size has the opposite effect. The increase in both the slurry flow rate and the ballast size changes the ballast motion state. Experiments verified the numerical lifting model of the ballast in the vertical pipeline. The measurements of the actual pipeline wall thickness verified that the simulation results regarding the ballast distribution were accurate.

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“…However, the collision near the wall was pronounced for particles with a large diameter [35]. Wang et al [32] also used the Eulerian-Eulerian model to evaluate the flow characteristics of ice slurry in various shapes of pipes, such as vertical, horizontal, and 90-degree elbow pipes [36,37].…”

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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Numerical investigation of isothermal and non-isothermal ice slurry flow in horizontal elliptical pipes

Cited by 21 publications

References 34 publications

Experimental research on titanium dioxide nanofluid in vacuum flash evaporation

Experimental research on titanium dioxide nanofluid in vacuum flash evaporation

Ballast Flow Characteristics of Discharging Pipeline in Shield Slurry System

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

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