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Studying the effect of material initial conditions on drying induced stresses

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Abstract

Cracking as a result of non-uniform deformation during drying is one of defects that may occur during drying and has to be dealt with by proper drying treatment. In the current study the effect of initial condition has been investigated on stress-strain induced by drying. The convective drying of a porous clay-like material has been simulated by using a mathematical model. Mass and heat transfer along with the mechanical behavior of the object being dried make the phenomenon a highly coupled problem. The coupling variables are the solid displacement, moisture content and temperature of the porous medium. A numerical solution is sought and employed to predict the influence of initial conditions of material on the drying induced stresses, the moisture content, and the temperature variations. Simulation results showed that increasing the initial temperature is an effective way to reduce the stresses induced by drying and to obtain products with good quality without significant change in drying curve and in comparison this is more effective than intermittent drying.

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Authors and Affiliations

  1. University of Birjand, Birjand, Iran

    M. Heydari, K. Khalili & S. Y. Ahmadi-Brooghani

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  1. M. Heydari
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  2. K. Khalili
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  3. S. Y. Ahmadi-Brooghani
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Correspondence to K. Khalili.

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Heydari, M., Khalili, K. & Ahmadi-Brooghani, S.Y. Studying the effect of material initial conditions on drying induced stresses. Heat Mass Transfer 54, 341–352 (2018). https://doi.org/10.1007/s00231-017-2132-2

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  • DOI: https://doi.org/10.1007/s00231-017-2132-2

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