A submodel for spherical particles undergoing phase change under the influence of convection

Bansal, Hemant; Nikrityuk, Petr A.

doi:10.1002/cjce.22591

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…The first term on the right side of the equation represents the temperature gradient in the dissociation region, and the second term represents the temperature gradient in the undissociated region. As per the processing method presented by Bansal and Nikrityuk, 29 the thermal conductivity expression of the spherical particle was used to substitute the temperature gradient value. Finally, the hydrate dissociation rate expression was obtained…”

Section: Discussionmentioning

confidence: 99%

“…If the specific distribution of the internal temperature of the particle is not considered and attention is only paid to the variation of the dissociation interface, the temperature gradient conditions at the dissociation interface can be obtained using |d r p /d t | to measure the dissociation rate of the hydrate, as follows: The first term on the right side of the equation represents the temperature gradient in the dissociation region, and the second term represents the temperature gradient in the undissociated region. As per the processing method presented by Bansal and Nikrityuk, the thermal conductivity expression of the spherical particle was used to substitute the temperature gradient value. Finally, the hydrate dissociation rate expression was obtained where r t = 0.01 R .…”

Section: Discussionmentioning

confidence: 99%

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Effect of Bubbles Produced from Hydrate-Bearing Particle Dissociation on Particle Motion in Water

et al. 2021

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Understanding the motion of natural gas hydrate-bearing particles in a pipeline is of great significance for developing natural gas exploitation technology. In this study, the effect of bubbles produced from hydrate dissociation on the particle settling characteristics and the drag coefficient were studied under different Reynolds numbers. In the experiment, two types of porous solid spherical particles, namely, silty clay and quartz, were used to study the settling of ordinary particles and hydrate-bearing particles using a customized experimental apparatus. The settling and dissociation of the particle in water and the motion of bubbles were captured using a high-speed camera. The results showed that the gas from the hydrate dissociation surrounded the particle, which caused the boundary layer at the particle surface to prematurely separate at the back end of the particle, thereby increasing the interaction forces between the particle and the water during motion. The influence of bubbles on the particle motion was closely related to the hydrate dissociation rate and the particle settling velocity. Moreover, a mathematical expression is provided to describe the entire process from sediment particles entering the water to hydrate dissociation. Furthermore, the dissociation rate of the hydrate-bearing sediment particle under water flow was obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Bubbles Produced from Hydrate-Bearing Particle Dissociation on Particle Motion in Water

et al. 2021

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“…In the metallurgical industry, this approach was introduced for modeling blast furnaces [14,15], non-metallic inclusions or gas bubbles in continuous casters [16][17][18][19][20][21][22], alloying in ladle during tapping of steel furnaces [23], gas-melt flow in steel LD (Linz-Donawitz) converters [24]. The method has recently been applied to track the moving crystals undergoing solidification under the influence of forced and natural convection [25,26]. Another interesting application in solidification is to track the liquid/solid interface of a dendrite undergoing diffusion-governed growth in the Lagrangian framework, while calculating the melt flow in the Eulerian framework [27].…”

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confidence: 99%

Volume-Averaged Modeling of Multiphase Flow Phenomena during Alloy Solidification

Ludwig

Kharicha

2019

Metals

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The most recent developments and applications in volume-averaged modeling of solidification processes have been reviewed. Since the last reviews of this topic by Beckermann and co-workers [Applied Mech. Rev. 1993, p. 1; Annual Rev. Heat Transfer 1995, p. 115], major progress in this area has included i) the development of a mixed columnar-equiaxed solidification model; ii) further consideration of moving crystals and crystal dendritic morphology; and iii) the model applications to analyze the formation mechanisms of macrosegregation, as-cast structure, shrinkage cavity and porosity in different casting processes. The capacity of computer hardware is still a limiting factor. However, many calculation examples, as verified by the laboratory casting experiments, or even by the casting processes at a small industrial scale, show great application potential. Following the trend of developments in computer hardware (projection according to Moore’s law), a full 3D calculation of casting at the industry scale with the multiphase volume-averaged solidification models will become practically feasible in the foreseeable future.

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Arbitrary shaped ice particle melting under the influence of natural convection

Bansal

Nikrityuk

2017

AIChE Journal

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This work is devoted to numerical simulations of an arbitrary shaped ice particle melting inside water under the influence of natural convection. Specifically, four different shapes of the ice particle have been studied: sphere, cylinder, cross shaped cylinder, and irregular sphere with radial bumps on its surface. A 2D axisymmetric particle‐resolved numerical model has been employed on a fixed grid to study the detailed melting dynamics of an ice particle. The solid‐liquid interface is treated as a porous medium characterized by the permeability coefficient which is used to damp the velocity values inside the interface. The model results have been compared with an existing experimental results produced by A. Shukla et al. (Metal Mater Trans B. 2011; 42(1):224–235). Very good agreement between our predictions and experimental data have been achieved. Based on the analysis of numerical simulation results, melting process is found to advance through two distinct regimes, namely, establishment of the natural convection and active melting of ice particle exhibiting substantial amount of fluid‐particle interactions. A set of dimensionless parameters have been identified to distinguish between regimes. Finally, we developed a semi‐empirical to predict the melting of any arbitrary shaped ice particle and validated it against the particle‐resolved numerical simulation and experimental results. The comparison showed good agreement. Finally, the presented semi‐empirical model can be used as sub‐grid model in Euler‐Lagrange based numerical models to study the phase change phenomena in particulate flow systems. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3158–3176, 2017

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A submodel for spherical particles undergoing phase change under the influence of convection

Cited by 6 publications

References 25 publications

Effect of Bubbles Produced from Hydrate-Bearing Particle Dissociation on Particle Motion in Water

Effect of Bubbles Produced from Hydrate-Bearing Particle Dissociation on Particle Motion in Water

Volume-Averaged Modeling of Multiphase Flow Phenomena during Alloy Solidification

Arbitrary shaped ice particle melting under the influence of natural convection

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