The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform
T G Myers - One of the best experts on this subject based on the ideXlab platform.
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Nanofluids: An innovative phase change material for cold storage systems?
International Journal of Heat and Mass Transfer, 2016Co-Authors: M.m. Macdevette, T G MyersAbstract:An analytical approach is used to solve a contact Melting Problem where an alumina-water nanofluid is used as the phase change material. The mathematical model describing the process is reduced to three ordinary differential equations which are solved by means of the Heat Balance Integral Method. The melt front separating the solid and liquid constituents that possess different thermophysical Problems (dependent on nanoparticle volume fraction) is tracked. The liquid height, solid height, total melt and melt rates are determined, as well as times to the onset of Melting and melt completion. The results for both base fluid and nanofluid are compared, showing that the nanofluid phase change material may not be more efficient at releasing energy and that the efficiency is dependent on system size.
Abdelkhalek Cheddadi - One of the best experts on this subject based on the ideXlab platform.
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An enhanced numerical approach for convection phase change Problems: A solution of tin Melting Problem
Case Studies in Thermal Engineering, 2020Co-Authors: Salaheddine Kaba, Khalid Achoubir, Abdelkhalek CheddadiAbstract:Abstract A comprehensive and efficient numerical phase change model compatible with the stream function-vorticity formulation is developed. The model is based on the source term of the enthalpy-porosity method derived from Darcy's law. The results of the model are compared with those of tin Melting at P r = 0.02 , R a = 2.5 × 10 5 , S t e = 0.01 , in this case the method demonstrates its capability to deal with this controversial case by using an optimal grid. The comparison with results obtained by using this approach was satisfactory.
Chu Guang - One of the best experts on this subject based on the ideXlab platform.
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Melting Problem of Polymer Pellets in Co-Rotating Twin-Screw Extruders I. Phase Change Fraction Method and Experiment Verification
China Plastics, 2001Co-Authors: Chu GuangAbstract:In twin screw extrusion process, the island sea model is the coexistent form of the two phase of solid and liquid, which has been seen usually in the Melting process of solid pellets. A simplified mathematical model of the island sea model was proposed, which was defined as middle model. Fraction of the phase change was introduced to divide the energy generated by viscous dissipation. Variation of the solid fraction and bulk temperature of the melt along the screw channel can be obtained. The variation of the solid fraction along the screw channel was verified by experiments. Comparison showed that calculating results were basically in agreement with the experimental ones.
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Melting Problem of Polymer Pellets in Co-Rotating Twin-Screw Extruders II:Influencing Factors in Melting Process of Polymer Pellets
China Plastics, 2001Co-Authors: Chu GuangAbstract:There are many influencing factors in the Melting process of polymer pellets in twin-screw extrusion. For the extrusion process with specific screw configuration and material, the influencing factors are summed to six ones, which are investigated by the phase change fraction method respectively.
M.m. Macdevette - One of the best experts on this subject based on the ideXlab platform.
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Nanofluids: An innovative phase change material for cold storage systems?
International Journal of Heat and Mass Transfer, 2016Co-Authors: M.m. Macdevette, T G MyersAbstract:An analytical approach is used to solve a contact Melting Problem where an alumina-water nanofluid is used as the phase change material. The mathematical model describing the process is reduced to three ordinary differential equations which are solved by means of the Heat Balance Integral Method. The melt front separating the solid and liquid constituents that possess different thermophysical Problems (dependent on nanoparticle volume fraction) is tracked. The liquid height, solid height, total melt and melt rates are determined, as well as times to the onset of Melting and melt completion. The results for both base fluid and nanofluid are compared, showing that the nanofluid phase change material may not be more efficient at releasing energy and that the efficiency is dependent on system size.
Yuwen Zhang - One of the best experts on this subject based on the ideXlab platform.
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Lattice Boltzmann Method Simulation of 3-D Melting Using Double MRT Model with Interfacial Tracking Method
arXiv: Fluid Dynamics, 2016Co-Authors: Mo Yang, Yuwen ZhangAbstract:Three-dimensional Melting Problems are investigated numerically with Lattice Boltzmann method (LBM). Regarding algorithm's accuracy and stability, Multiple-Relaxation-Time (MRT) models are employed to simplify the collision term in LBM. Temperature and velocity fields are solved with double distribution functions, respectively. 3-D Melting Problems are solved with double MRT models for the first time in this article. The key point for the numerical simulation of a Melting Problem is the methods to obtain the location of the Melting front and this article uses interfacial tracking method. The interfacial tracking method combines advantages of both deforming and fixed grid approaches. The location of the Melting front was obtained by calculating the energy balance at the solid-liquid interface. Various 3-D conduction controlled Melting Problems are solved firstly to verify the numerical method. Liquid fraction tendency and temperature distribution obtained from numerical methods agree with the analytical results well. The proposed double MRT model with interfacial tracking method is valid to solve 3-D Melting Problems. Different 3-D convection controlled Melting Problems are then solved with the proposed numerical method. Various locations of the heat surface have different Melting front moving velocities, due to the natural convection effects. Rayleigh number's effects to the 3-D Melting process is discussed.
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Numerical Simulation of Melting Problems Using the Lattice Boltzmann Method with the Interfacial Tracking Method
Numerical Heat Transfer Part A: Applications, 2015Co-Authors: Mo Yang, Yuwen ZhangAbstract:A lattice Boltzmann method with an interfacial tracking method is used to solve Melting Problem in an enclosure. Both conduction- and convection-controlled Melting Problems are solved to validate the proposed method. For the conduction-controlled Melting Problem, the results agreed very well with those from the analytical solution. The results for the convection-controlled Melting Problem also agreed with those in the literature. The proposed approach is valid for numerical simulation of the Melting Problem.
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A Hybrid Lattice Boltzmann and Finite-Volume Method for Melting with Convection
Numerical Heat Transfer Part B: Fundamentals, 2014Co-Authors: Mo Yang, Yuwen ZhangAbstract:A hybrid lattice Boltzmann and finite-volume model is proposed to solve the natural-convection-controlled Melting Problem. The lattice Boltzmann method (LBM) is applied to solve the velocity field, while the temperature field is obtained by the finite-volume method (FVM). The D2Q9 model and finite-difference velocity gradient boundary condition are used in the LBM and the SIMPLE algorithm with QUICK scheme is employed in the FVM. An interfacial tracking model based on energy balance at the interface is applied to obtain the location of the solid–liquid interface. The results from the present hybrid method are validated with experimental results, and good agreement is obtained.
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Analytical solution of Melting in a subcooled semi-infinite solid with boundary conditions of the second kind
Journal of Thermal Science, 1993Co-Authors: Yuwen Zhang, Zhongqi Chen, Qijie WangAbstract:The Melting Problem in a semi-infinite region with constant heat flux boundary condition is solved by a semi-exact method and an integral approximate method. Effect of subcooling on the transient solid-liquid interface location and surface temperature are also discussed in this paper.