Abstract

Various fields of science and technology require calculations of heat transfer processes in regions of different shapes, the boundaries of which move with time. These are such tasks as a Stefan problem of ground freezing and ingot crystallization, which can be solved analytically under certain assumptions. Later appeared works on calculating the temperature field in burning fuel grains, thermal decomposition of solid mixtures, melting and ablation of heat-resistant coatings. Mathematical models of such processes include the heat equation, initial and boundary conditions, as well as the conditions of boundary displacement. At the same time, there are tasks associated with the calculation of heat and mass transfer processes, when liquid and gas flow in the regions, the boundaries of which move with time. Mathematical models of such problems include systems of partial differential equations, which can be solved only by numerical methods. This paper proposes an effective numerical method for solving such problems on the basis of the finite difference method, which allows tracking the position of region boundaries when they considerably move on the adaptive computational mesh.

Highlights

  • В различных областях науки и техники необходимо рассчитывать процессы переноса тепла в областях различной формы, границы которых изменяются с течением времени

  • There are tasks associated with the calculation of heat and mass transfer processes, when liquid and gas flow in the regions, the boundaries of which move with time

  • This paper proposes an effective numerical method for solving such problems on the basis of the finite difference method, which allows tracking the position of region boundaries when they considerably move on the adaptive computational mesh

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Summary

Расчет и конструирование

В области, занятой гранулами охладителя S S0 , где S0 – площадь сечения пустой камеры охлаждения, а – пористость. Обозначают параметры жидкости и пара на линии насыщения. Система уравнений (1) преобразуется к дивергентному виду lФ dl[1] d dl[2] d lF l1. В области 0 y 1 строится равномерная разностная сетка с шагом 1 N 1 , где N – число узлов сетки. При изменении границ области l1 , l2 изменяются z-координаты узлов сетки, а y-координаты остаются постоянными.

Cn l m
HEAT AND MASS TRANSFER IN AN AREA WITH MOVING BORDERS
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