ดวงตา อุดมเลิศสกุล. Effect of Initial Steam Condensation on Predictability of a Model for Low-Pressure Superheated Steam Drying. Master's Degree(Food Engineering). King Mongkut's University of Technology Thonburi. : King Mongkut's University of Technology Thonburi, 2006.
Effect of Initial Steam Condensation on Predictability of a Model for Low-Pressure Superheated Steam Drying
Abstract:
A simple three-dimensional liquid diffusion based model was developed to predict the evolutions
of the moisture content and temperature of a product (carrot cube) undergoing low-pressure super
heated steam drying (LPSSD). The effect of the product shrinkage was included directly in the model.
In addition, the effect of including initial steam condensation on the improvement of the model
predictability was also investigated. The coupled heat and mass balance equations, along with
appropriate initial and boundary conditions, were solved with the finite element method using a
commercially available software COMSOL Multiphysics version 3.2. The simulated results were
compared with the available experimental data in the literature over the temperature range of
60-80 ํC and pressure range of 7-13 kPa. By adding the effect of initial steam condensation, it
was found that the model prediction of the temperature and moisture content was in better
agreement with the experimental data and comparing with the original model without initial
steam condensation under almost all conditions, especially at higher operating pressures.