CFD simulation of melting process of phase change materials (PCMs) in a spherical capsule

Sattari, Hamta; Mohebbi, Ali; Afsahi, M. Mehdi; Yancheshme, Amir Azimi

doi:10.1016/j.ijrefrig.2016.09.007

Cited by 108 publications

(23 citation statements)

References 12 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The degree of sensitivity of the numerical predictions to the value of the permeability coefficient C appears to be diverse. Several studies reported that the chosen value of C affect the numerical results predicted by the enthalpy-porosity method for isothermal phase-change problems [34][35][36], in which phase transformation occurs at the melting temperature of the material. This effect is not physically realistic for isothermal phase transformations and should be considered as a numerical artefact [37].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Numerical Predictions to the Permeability Coefficient in Simulations of Melting and Solidification Using the Enthalpy-Porosity Method

2019

View full text Add to dashboard Cite

The high degree of uncertainty and conflicting literature data on the value of the permeability coefficient (also known as the mushy zone constant), which aims to dampen fluid velocities in the mushy zone and suppress them in solid regions, is a critical drawback when using the fixed-grid enthalpy-porosity technique for modelling non-isothermal phase-change processes. In the present study, the sensitivity of numerical predictions to the value of this coefficient was scrutinised. Using finite-volume based numerical simulations of isothermal and non-isothermal melting and solidification problems, the causes of increased sensitivity were identified. It was found that depending on the mushy-zone thickness and the velocity field, the solid–liquid interface morphology and the rate of phase-change are sensitive to the permeability coefficient. It is demonstrated that numerical predictions of an isothermal phase-change problem are independent of the permeability coefficient for sufficiently fine meshes. It is also shown that sensitivity to the choice of permeability coefficient can be assessed by means of an appropriately defined Péclet number.

show abstract

Section: Introductionmentioning

confidence: 99%

Sensitivity of Numerical Predictions to the Permeability Coefficient in Simulations of Melting and Solidification Using the Enthalpy-Porosity Method

2019

View full text Add to dashboard Cite

show abstract

“…In an effort to reduce the computational cost, the assumption of two-dimensional axisymmetric flow has been commonly made (e.g. [1], [2] and [3]).…”

Section: Extended Abstractmentioning

confidence: 99%

Three-Dimensional Numerical Investigation of Constrained Melting of N-Octadecane in a Spherical Enclosure

Hummel¹,

Beer²,

Hornung³

2018

Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer

View full text Add to dashboard Cite

“…In their work they took in to account the PCM volume changes and proved that when natural convection is not modelled there is a high numerical error. Sattari et al [36] have investigated through CFD modelling a PCM melting process inside a spherical capsule at low temperatures and the effect of different operating and design parameters, i.e. capsule size, parameters on the process evolution.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of a silicon-based latent heat thermal energy storage system operating at ultra-high temperatures

et al. 2019

View full text Add to dashboard Cite

show abstract

CFD simulation of melting process of phase change materials (PCMs) in a spherical capsule

Cited by 108 publications

References 12 publications

Sensitivity of Numerical Predictions to the Permeability Coefficient in Simulations of Melting and Solidification Using the Enthalpy-Porosity Method

Sensitivity of Numerical Predictions to the Permeability Coefficient in Simulations of Melting and Solidification Using the Enthalpy-Porosity Method

Three-Dimensional Numerical Investigation of Constrained Melting of N-Octadecane in a Spherical Enclosure

Numerical simulation of a silicon-based latent heat thermal energy storage system operating at ultra-high temperatures

Contact Info

Product

Resources

About