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What is Falling Drying Rate Period

Chapter 1
Optimization of Design for Better Structural Capacity
Usually, drying passes by three phases. It starts by a short adaptation phase that most of the researchers ignore. The second phase is the constant drying rate phase, during this phase the drying rate is constant, then comes the third phase which is the falling drying rate phase. In this phase the surface of the material is not completely full of water, subsequently the drying rate starts decreasing.
Published in Chapter:
Using Diffusion Model for Prediction and Optimization of Drying Process of Building Material: Simulation of Variable Environmental Conditions
Lyes Bennamoun (University of New Brunswick, Canada)
Copyright: © 2019 |Pages: 23
DOI: 10.4018/978-1-5225-7059-2.ch001
Abstract
The aim of this chapter is to confirm the possibility of using the simple diffusion model to predict the behavior of a building material during the application of drying process under variable operating conditions. This approach can be considered as a simulation of the effect of the variable climatic conditions on the building material. During this research, the thermo-physical properties of the tested material as well as the drying air are considered as variable and changing with the operating conditions. Accordingly, diffusion coefficient is determined experimentally and is considered as variable with the temperature and the humidity and represented as function of the wet bulb temperature. Two sorts of conditions are tested: constant flux and convective flux. Furthermore, two types of changes are also tested: sudden changes and progressive changes of the drying conditions. The results of the study are mainly represented by the drying curves or the drying kinetics.
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