Abstract
An algorithm for numerical simulation of transient moisture content fields and mechanical processes in ceramic ware at drying in industrial aggregates is developed. It is based on mathematical models of the mass transfer and mechanical behavior in the ceramic bodies, data for the drying regime and physical properties of the material as function of water content. The models allow variations of the drying conditions in order to choice the most efficient regime at existing or design dryers. The algorithm is applied for a direct coupled finite element analysis of wet bricks behavior in continuous working drying installation. The shrinkage mode, modulus of elasticity, Poisson ratio, modulus of rupture, effective mass transfer coefficient and critical moisture content are determined by experimental tests of the material. They are used to simulate numerically three-dimensional moisture, stress and strain fields in ceramic bodies at the existing drying regime. Ways for improvement of the models and their application for estimation of the potential for energy savings in industrial dryers are discussed.
Highlights
The aim of the present study is to develop an algorithm for numerical simulation of the coupled structural-diffusion behavior of ceramic ware at industrial convective drying, suitable for analysis and improvement of the efficiency of the process
The convective drying of the ceramic material can be examined in three main periods (Figure 1): preheating period (0), constant drying rate period (CDRP or I) and falling drying rate period (FDRP or II)
The transient fields of the moisture content and subsequent mechanical behavior of the materials are obtained by coupled numerical solution of mass transfer equation (1) and stress-strain relationship (2) for 3D finite element mesh, approximating the geometry of the ceramic body
Summary
Industrial drying is a key process in the ceramic manufacturing. The right organization of the drying regime is important for the quality of the products and the associated energy inputs [1]. The advanced ceramic industry is continually evolving in а direction of optimization of geometry and materials of the products in order to increase their functionality. These processes provoke research activities oriented to improving of the energy and technological efficiency of the industrial dryers
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