...Rajesh Vemula; Hakan F. Oztop Purpose The purpose of this study is to focus on a numerical assessment of natural convection and melting behavior in a square enclosure containing a water-based nano-encapsulated phase change material ( NEPCM ) nanofluid, with particular attention to the influence...

... model, the porous structure with complexity and disorder was generated by using a stochastic growth method, and then the Shan-Chen multiphase model and enthalpy-based phase change model were coupled by introducing a freezing interface force to describe the variation of phase interface. The pore size...

... 2019 12 02 2019 © Emerald Publishing Limited 2019 Emerald Publishing Limited Licensed re-use rights only Phase change Gravity Temperature gradient Lattice Boltzmann method Pseudopotential Van der Waals Multiphase flows are nearly ubiquitous in natural and industrial...

... nanofluid is very effective in the postponement of the boiling process. Hence, by change the amount of volume fraction of nanoparticles in base fluid, the location of phase change and bubble creation are changed. Also, at the Reynolds numbers of 50,000, 100,000 and 150,000 with the volume fraction of 2 per...

... at: bodong@dlut.edu.cn 19 09 2017 19 01 2018 03 02 2018 © Emerald Publishing Limited 2018 Emerald Publishing Limited Licensed re-use rights only Phase change Lattice Boltzmann method Droplet Falling Freezing trend A = surface area of the droplet...

...V R Voller Purpose – The purpose of this paper is to demonstrate how anomalous diffusion behaviors can be manifest in physically realizable phase change systems. Design/methodology/approach – In the presence of heterogeneity the exponent in the diffusion time scale can become anomalous...

... to predict the phase-change process. Findings – Numerical results are in good agreement with existing experimental results. Numerical results confirm the feasibility of the hybrid LBM for direct simulations of nucleate and transition boiling. The data exhibit correct parametric dependencies of bubble...

...S.G. Ahmed In the present paper, a simple mushy zone model and the boundary integral technique are applied to solve a phase change moving boundary problem. Owing to the use of the mushy zone model, some mathematical considerations are taken when applying the integral equation at the extreme points...

...Joo‐Sik Yoo The problem of transient heat transfer and growth of solid in the inviscid stagnation flow when phase change from liquid to solid occurs is considered. A fast and accurate numerical scheme is developed to determine the instantaneous temperature distribution in both solid and liquid...

.... The solution is verified by comparison with the results of the classical finite volume method. Results for a 0.500[m] diameter Al 4.5 per cent Cu alloy billet at typical casting conditions are given. Alloys Boundary element method Castings Convective‐diffusive problems Phase change Spline function...

...M. Lacroix; M. Benmadda A numerical study is reported of melting from a horizontal heated wall with vertically oriented fins embedded in the phase change material. This work is motivated by the need to improve the heat transfer rates during the charge and discharge cycles in latent heat thermal...

...Zhen‐Xiang Gong; Arun S. Mujumdar This paper presents a two‐dimensional finite element model for convection‐dominated melting and freezing problems. The enthalpy‐porosity approach is utilized to account for the physics of the evolution of the melt velocity at the solid/liquid phase change interface...

... which determines the geometric structure of the medium and the nature of the interface (fixed or moving). The results for the one and two dimensional conduction‐dominated phase change problem show that the oscillations produced by previous fixed‐grid methods are eliminated. St₂ = Stefan...

...V.R. Voller; P. Felix; C.R. Swaminathan Cyclic phase change involves the successive freezing and melting of a region driven by a boundary temperature that cycles above and below the solid/liquid phase change temperature. In this paper, a recently proposed fixed grid phase change enthalpy method...

...Hongjun Li; C.K. Hsieh; D.Y. Goswami A method has been developed for conjugate heat transfer analysis of fluid flow inside parallel channels formed by a phase change material (PCM)separated from the fluid by a wall. The phase change in the PCM is two dimensional and a hybrid analysis consisting...

...R.L. McAdie; J.T. Cross; R.W. Lewis; D.T. Gethin A rigorous Finite Element (FE) formulation based on an enthalpy technique is developed for solving coupled nonlinear heat conduction/mass diffusion problems with phase change. The FE formulation consists of a fully coupled heat conduction and solute...

...J.F.T. Pittman; G.P. Whitham Methods that use spatial gradients of enthalpy to evaluate effective specific heats and capture latent heat effects in phase change problems have been used successfully in finite element formulations based on linear interpolation. In view of the greater geometrical...

...MINWU YAO; ARNON CHAIT The homographic approximation, in which the Heaviside step function is replaced by a continuous smooth curve, is applied to the enthalpy method for heat transfer problems with isothermal phase change. Both the finite difference and finite element implementations, based...