Nonlinear enthalpy transformation for transient convective phase change in Smoothed Particle Hydrodynamics (SPH)

A three-dimensional model is presented for the prediction of solidification behavior using a nonlinear transformation of the enthalpy equation in a Smoothed Particle Hydrodynamics (SPH) discretization. The effect of phase change in the form of release and absorption of latent heat is implemented implicitly as variable source terms in the enthalpy calculation. The developed model is validated against various experimental, analytical, and numerical results from the literature. Results confirm accuracy and robustness of the new procedure. Finally, the SPH model is applied to a study of suspension plasma spraying (SPS) by predicting the impact and solidification behavior of molten ceramic droplets on a substrate

Numerical simulation of solid particle ablation in thermal plasmas using CIP-VOF Method

金沢大学理工研究域電子情報学系Numerical modeling was performed for ablation processing of a solid particle in a thermal plasma flow. The model is based on Constrained Interpolation Propagation-Combined and Unified Procedure (CIP-CUP) method, which can simulate incompressible and compressible flows and then the multiphase flow. Furthermore, the volume of fraction (VOF) function was introduced to track the surface of the solid during ablation. Using that developed model, the ablation process of a polyethylene particle was simulated in a thermal plasma flow. Results show that ablation occurs more strongly at the particle\u27s upstream surface, thereby producing strong gas flow. © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc

Second order accurate volume tracking based on remapping for triangular meshes

This paper presents a second order accurate piecewise linear volume tracking based on remapping for triangular meshes. This approach avoids the complexity of extending unsplit second order volume of fluid algorithms, advection methods, on triangular meshes. The method is based on Lagrangian–Eulerian (LE) methods; therefore, it does not deal with edge fluxes and corner fluxes, flux corrections, as is typical in advection algorithms. The method is constructed of three parts: a Lagrangian phase, a reconstruction phase and a remapping phase. In the Lagrangian phase, the original, Eulerian, grid is projected along trajectories to obtain Lagrangian grids. In practice, this projection is handled through the time integration of velocity field for grid vertices at each time step. The reconstruction is based on truncating the volume material polygon for each Lagrangian mixed grid. Since in piecewise linear approximation, the interface is represented by a segment line, the polygon material truncation is mainly finding the segment interface. Finding the segment interface is calculating the line normal and line constant at each multi-fluid cell. Details of applying two normal calculation methods, differential and geometric least squares (GLS) methods, are given. While the GLS method exhibits second order accurate approximation in reproducing circular interfaces, the differential least squares (DLS) method results in a first order accurate representation of the interface. The last part of the algorithm which is remapping of the volume materials from the Lagrangian grid to the original one is performed by a series of polygon intersection procedures. The behavior of the algorithm is investigated for flow fields with constant interface topology and flow fields inducing large interfacial stretching and tearing. Second order accuracy is obtained if the velocity integration as well as the reconstruction steps are at least second order accurate

Progress of international hydrogen production network for the thermochemical Cu–Cl cycle

This paper presents recent advances by an international team which is developing the thermochemical copper–chlorine (Cu–Cl) cycle for hydrogen production. Development of the Cu–Cl cycle has been pursued by several countries within the framework of the Generation IV International Forum (GIF) for hydrogen production with the next generation of nuclear reactors. Due to its lower temperature requirements in comparison with other thermochemical cycles, the Cu–Cl cycle is particularly well matched with Canada's Generation IV reactor, SCWR (Super-Critical Water Reactor), as well as other heat sources such as solar energy or industrial waste heat. In this paper, recent developments of the Cu–Cl cycle are presented, specifically involving unit operation experiments, corrosion resistant materials and system integration

Preface

Abstract The 17th International Symposium on Plasma Chemistry (ISPC 17) was held in Toronto, Ontario, Canada from 7-12 August 2005. ISPC 17 is sponsored by the International Union of Pure and Applied Chemistry (IUPAC) and the International Plasma Chemistry Society (IPCS). This is the second time that the ISPC was held in Canada (ISPC 6, Montreal, Quebec, 1983). Two short courses with 60 participants in low- and high-pressure plasma processing were offered prior to the start of the symposium (4-6 August 2005). A one-day industrial workshop with 63 participants was also held on 7 August 2005. ISPC is the main symposium on partially ionized gases and plasma processing science. During ISPC 17, 560 researchers, including 183 students, from 48 countries presented their latest discoveries in this field. 540 contributed papers, 5 plenary and 18 invited abstracts covering 15 topics in plasma processing science were presented during the symposium. All submitted abstracts were reviewed by the International Organizing Committee. The complete text of the papers was provided on a searchable CD. The high number of contributed papers and the high level of registration in both the industrial workshop as well as the short courses reflect the continued support and interest of researchers in plasma processing science community in this bi-annual event. The invited plenary and topical lectures, selected by the International Organizing Committee, are representative of the great progress in the different areas of plasma chemistry. This issue of Pure and Applied Chemistry offers an overview on the recent advances in high- and low-pressure plasmas as well as on more specific developments in plasma processing science. These topics were presented at the ISPC 17 by plenary and topical invited speakers. Javad Mostaghimi Conference Chair</jats:p