By Evangelos Tsotsas, Arun S. Mujumdar
Content material:
Chapter 1 accomplished Drying versions in accordance with quantity Averaging: heritage, software and viewpoint (pages 1–55): Prof. Patrick Perree, Dr. Romain Remond and Prof. Ian W. Turner
Chapter 2 Pore?Network types: a robust software to review Drying on the Pore point and comprehend the impression of constitution on Drying Kinetics (pages 57–102): Thomas Metzger, Prof. Evangelos Tsotsas and Dr. Marc Prat
Chapter three non-stop Thermomechanical types utilizing Volume?Averaging idea (pages 103–124): Dr. Frederic Couture, Philippe Bernada and Prof. Michel A. Roques
Chapter four non-stop Thermohydromechanical version utilizing the idea of combinations (pages 125–154): Prof. Stefan J. Kowalski
Chapter five CFD in Drying expertise – Spray?Dryer Simulation (pages 155–208): Dr. Stefan Blei and Prof. Martin Sommerfeld
Chapter 6 Numerical equipment on inhabitants Balances (pages 209–260): Dr. Jitendra Kumar, Dr. Mirko Peglow, Prof. Gerald Warnecke, Jun. Prof. Stefan Heinrich, Prof. Evangelos Tsotsas, Prof. Lothar Morl, Prof. Mike Hounslow and Dr. Gavin Reynolds
Chapter 7 Process?Systems Simulation instruments (pages 261–305): Ir. Ian C. Kemp
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Additional info for Modern Drying Technology: Computational Tools at Different Scales, Volume 1
Sample text
The fluid velocity is in the range 2–15 m sÀ1 and the dry air temperature is accurate to one or two degrees Celsius in the range 40–200 8C. An external boiler generating low-pressure steam allows regulation of the wet-bulb Fig. 8 Scheme of the wind-tunnel drier [adapted from ´ and Martin, 1994]. Perre 19 20 1 Comprehensive Drying Models based on Volume Averaging temperature. , preparation of the sample. 1 Test 1: Superheated Steam By comparison with Test 2 (Fig. 11), it can be seen that the main effect of hightemperature convective drying is a significant reduction in the drying time (Figs.
17. The main advantage of high-temperature convective drying is an acceleration of internal moisture transfer due to the development of an overpressure in the gaseous phase inside the board. After the initial transient period, the constant drying-rate period takes place for a sapwood board. During this period, which lasts for several hours, all temperatures equilibrate at the wet-bulb temperature and the overpressure remains very small. At the beginning of the second drying period (after around 350 min), an important overpressure develops due to the temperature increase, which disappears only once the entire board enters the hygroscopic range.
The challenge, however, is to overcome the problems associated with structural dependencies and the complex geometries evident in the internal pore network within the medium. Typically, transport phenomena are represented according to macroscopic equations valid at the relevant level of description. Selecting a representative elementary volume, or averaging volume, containing many pores and assuming that the porous material can be represented as a fictitious continuum (Bear and Corapcioglu, 1987) is certainly one way to achieve this description.