N. Williams Portal, M. van Aarle, and J. van Schijndel
Department of Civil and Environmental Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Department of Architecture, Building and Planning, Technical University of Eindhoven, Eindhoven, The Netherlands
This paper includes the implementation and comparison of two types of moisture potentials for the combined transport: the natural logarithmic of the suction pressure (LPc) and the relative humidity (RH). The finite element method has been utilized to evaluate coupled 1D thermal and hygric transport by means of COMSOL Multiphysics. The combined transport mechanisms were described by the ...
M. Bianchi Janetti, and F. Ochs
University of Innsbruck
Unit Building Physics
The simulation of heat and moisture transfer represents an essential resource in designing energy efficient buildings. In this paper a time-dependent wall model, consisting of several homogeneous domains, with third-type boundary conditions imposed on the surfaces, is implemented in the COMSOL Multiphysics environment. Temperature and moisture content is calculated inside the construction for ...
Numerical Study of the Effect of Fins on the Natural Convection Driven Melting of Phase Change Material
C. Liu, and D. Groulx
Natural convection has to be accounted and simulated for in order to properly describe the physics encounter in the phase change process. A simplified two-dimensional model was created in COMSOL 4.1. Natural convection was accounted for by adding a volume force and using the Boussinesq approach. The heat transfer and laminar flow physics were used. Results showed that natural convection played ...
L. Desgrosseilliers, and D. Groulx
A cornerstone of Chemical and Mechanical Engineering undergraduate programs the world over is the experimental and theoretical study of heat exchange. Graduating engineering students gain some appreciation in their lab course by comparing empirical correlations combined with the thermodynamics of heat exchange with the real operation of a counter-current, double pipe, single-phase heat exchanger.
I. Bodey, R. Arimilli, and J. Freels
Dept. of Mechanical, Aerospace and Biomedical Eng., The University of Tennessee, Knoxville, TN
Research Reactors Division, Oak Ridge National Laboratory, Oak Ridge, TN
The High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL) is an 85 MW, light-water moderated, research reactor that operates at low temperature and high pressure. The HFIR is presently scheduled to convert from a high enriched uranium fuel (HEU) to a low enriched uranium fuel (LEU) in 2019. Due to cost constraints, not all experiments will be repeated for the LEU fuel ...
Sequential Estimation of Temperature-Dependent Thermal Diffusivity in Cherry Pomace during Nonisothermal Heating
I. Greiby, D. Mishra, and K. Dolan
Dept. of Biosystems & Agricultural Eng., MSU, East Lansing, MI
Dept. of Biosystems & Agricultural Eng., MSU, East Lansing, and Nestle Nutrition, PTC Fremont, MI
Dept. of Biosystems & Agricultural Eng. and Dept. of Food Science & Human Nutrition, MSU, East Lansing
Fruit and vegetables are a rich source of many bio-active compounds from which value-added nutraceuticals can be produced. To design processes for these solids that will maintain food safety and maximize quality over a large temperature range, temperature-dependent thermal properties are needed. The objective of this work was to estimate temperature and moisture-dependent thermal diffusivity of ...
O. Yildirim, and Z. Guo
Intellectual Ventures Laboratories
Regenerative heat exchangers (RHX) find widespread applications in liquid food or pharmaceutical processing as well as in reaction engineering. Whereas \"large\" RHX systems have been in use for a long time, their smaller micro-channel counterparts are a more recent area of interest. Here, we describe the design and development of a novel micro-channel counter-current regenerative heat ...
S. Boukhris, M. Denton, and Y. Feng
Computational Bioengineering and Control Lab, University of Texas at San Antonio, San Antonio, TX
TASC, Inc. Biomedical Sciences and Technology Dept., Ft. Sam Houston, TX
The use of lasers in the military and everyday life is growing each year. The purpose of the current research is to take full advantage of this new spatially-resolved thermal data to construct a mathematical and numerical model for laser-induced damage using COMSOL Multiphysics. The microthermography data were extracted for vertical and horizontal lines through the laser-exposed area of cell ...
A. Roday, and P. Nicosia
Garlock Sealing Technologies
Sintering is an important step in the manufacturing of polytetrafluoroethylene (PTFE) billets. The challenge in heating large billets stems from the inherent low thermal conductivity of PTFE. Existing literature suggests determining maximum heating rate experimentally using recommended guidelines. This paper uses COMSOL to aid in optimizing the temperature profile required for a particular ...
Microwave Drying of Cellular Ceramic Substrates: A Conjugate Modeling Approach to Understand Surface Moisture Migration
A. Halder, and J. George
Painted Post, NY
Microwave drying processes are critical components in the manufacture of cellular ceramic substrates and filters. The objective of this study is to develop a comprehensive model at a small scale and include all the possible physics that are important during microwave drying processes. Based on the results, conclusions are made on the importance of different factors in drying.