Original

Heat and Mass Transfer

, Volume 48, Issue 12, pp 2023-2032

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Non-stationary drying of ceramic-like materials controlled through acoustic emission method

  • Stefan Jan KowalskiAffiliated withInstitute of Technology and Chemical Engineering, Poznań University of Technology Email author 
  • , Justyna SzadzińskaAffiliated withInstitute of Technology and Chemical Engineering, Poznań University of Technology

Abstract

This paper presents results of convective drying of ceramic-like materials in non-stationary conditions. The effect of periodically changing drying parameters at different frequencies and amplitudes on material quality has been investigated. During drying tests the destruction of the material was controlled trough the acoustic emission method and monitored with a digital camera. The experiments were carried out on cylindrically shaped samples made of KOC kaolin clay. The non-stationary drying consisted in periodical changes of the drying medium temperature and humidity. It has been found that a properly arranged methodology of non-stationary drying positively affects the product quality, mainly when drying is carried on with periodical changes of air humidity and to lesser extent with periodical changes of air temperature.