Phase Change With Convection Modelling And Validation
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Phase Change with Convection: Modelling and Validation
Solid-liquid phase change phenomena are present in a large number of industrial applications and natural processes like material processing, crystal growth, heat storage, icebergs or magma eruption. Numerical modelling of strongly non-linear, moving boundary, thermal and fluid flow problems is a challenging task. The book gives a review of modelling methods of phase change problems, numerical and experimental methods used in the field. It combines experience of theoreticians with those using numerical tools for modelling problems of solidification. It offers researchers and engineers knowledge and critical assessment of numerical approaches, physical models and validation methods used in the field of modelling industrial problems. The book collects in an unique way most recent knowledge on modelling of phase change problems, from micro scale problems and the interface (growth of dendrites) to macro scale models.
MODELING OF THE PHASE CHANGE MATERIAL OF A HYBRID STORAGE USING THE FINITE ELEMENT METHOD
Author: Lukas Kasper
language: en
Publisher: TU Wien Academic Press
Release Date: 2020-09-03
To increase the efficiency of energy-intensive industrial processes, thermal energy storages can offer new possibilities. A novel approach is investigated in the project HyStEPs. In this concept, containers filled with PCM are placed at the shell surface of a Ruths steam storage, to increase storage efficiency. In this work, a two-dimensional model using the finite element method is developed to simulate the PCM of the hybrid storage as designed in the HyStEPs project. The apparent heat capacity method is applied in a MATLAB implementation, considering heat transfer by both conduction and natural convection. This successfully validated code can handle any desired layout of materials arranged on a rectangular domain. Furthermore, a parameter study of different dimensions and orientations of the PCM cavity was conducted. The impact of natural convection was found to lead to significantly varying behaviour of the studied cavities with different orientation during the charging process, while it was found to be negligible during the discharging process.
Computational Thermo-Fluid Dynamics
Author: Petr A. Nikrityuk
language: en
Publisher: John Wiley & Sons
Release Date: 2011-09-19
Combining previously unconnected computational methods, this monograph discusses the latest basic schemes and algorithms for the solution of fluid, heat and mass transfer problems coupled with electrodynamics. It presents the necessary mathematical background of computational thermo-fluid dynamics, the numerical implementation and the application to real-world problems. Particular emphasis is placed throughout on the use of electromagnetic fields to control the heat, mass and fluid flows in melts and on phase change phenomena during the solidification of pure materials and binary alloys. However, the book provides much more than formalisms and algorithms; it also stresses the importance of good, feasible and workable models to understand complex systems, and develops these in detail. Bringing computational fluid dynamics, thermodynamics and electrodynamics together, this is a useful source for materials scientists, PhD students, solid state physicists, process engineers and mechanical engineers, as well as lecturers in mechanical engineering.