THERMAL SCIENCE

International Scientific Journal

External Links

COMPUTATIONAL ANALYSIS OF HEAT AND MASS TRANSFER DURING MICROWAVE DRYING OF TIMBER

ABSTRACT
The need for improvement in engineering design and process optimization for microwave drying of wood has stimulated the development of computer simulation techniques to predict temperature and moisture history and distribution wood sample. A three-dimensional comprehensive heat and mass transfer model was developed to simulate the free liquid, vapor, and bound water movement including consideration of internal heat generation in microwave drying of yellow poplar specimens. The model was solved using the finite element analysis with FEMLsoftware. The model predictions compared favorably with predicted and experimental solutions. The effect of changes of the most important parameters on the predictions of the model is also presented. The results showed that the variations of irradiation time, microwave power level and sample thickness played an important role in overall drying kinetics.
KEYWORDS
PAPER SUBMITTED: 2014-01-09
PAPER REVISED: 2014-04-04
PAPER ACCEPTED: 2014-04-04
PUBLISHED ONLINE: 2014-05-04
DOI REFERENCE: https://doi.org/10.2298/TSCI140109055K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE 5, PAGES [1447 - 1455]
REFERENCES
  1. Kisakürek, B., Flash Drying, in Majumdar, A.S., ed., Handbook of Industrial Drying, Marcel Dekker, New York, vol. 1, 1995
  2. Mujumdar, A.S., Menon, A.S., Drying of Solids, in: Handbook of Industrial Drying (Ed. A.S. Mujumdar), Marcel Dekker, New York, vol. 1, 1995
  3. Kumar, P., Mujumdar, A.S., Microwave Drying: Effects on Paper Properties, Drying Technology, 8 (1990), 2, pp.1061-1087
  4. Gong, L., Plumb, O.A., Non-Homogeneous Model for Moisture Transport in Softwood During Drying. ASME, HTD, 129 (1990), pp. 139-148
  5. Cloutier, A., Fortin, Y, A Model of Moisture Movement in Wood Based on Water Potential and the Determination of the Effective Water Conductivity, J. Wood Science Technology, 27(1993), 2, pp. 95-114
  6. Luikov, A.V., Systems of Differential Equations of Heat and Mass Transfer in Capillary-Porous Bodies (Review), Int. J. Heat Mass Transfer, 18 (1975), pp. 1-14
  7. Whitaker, S., Simultaneous Heat, Mass, and Momentum Transfer in Porous Media: A Theory of Drying, in: Advances in Heat Transfer (Eds. Hartnett, J.P., Irvin, T.F.), Academic Press, San Diego., 1977, pp. 119-203
  8. Antti, A.L., Microwave Drying of Hardwood: Simultaneous Measurements of Pressure, Tmperature, and Weight Reduction, Forest. Prod. J., 42 (1992), 6, pp. 49-54
  9. Antti, A.L., Microwave Drying of Pine and Spruce, Holz als Roh-und Werkstoff, 53 (1995), pp. 333-338
  10. Antti, A.L., Perré, P., A Microwave Applicator for on Line Wood Drying: Temperature and Moisture Distribution in Wood, Wood Sci. and Tech.,33 (1999), pp.123-138
  11. Perré, P., Turner, I. W., The Use of Numerical Simulation as a Cognitive Tool for Studying the Microwave Drying of Softwood in an over-sized Waveguide, Wood Sci. and Tech.,33 (1999), pp. 445-464
  12. Cividini, R., Travan, I., Microwave Heating in Vacuum-Press Drying of Timber: Practical Investigation, Proceedings of 8th International IUFRO Wood Dry. Conf., Brasov, Romania, 2003, pp. 150-155
  13. Seyfarth, R., Leiker, M., Mollekopf, N., Continuous Drying of Lumber in a Microwave Vacuum Kiln., Proceedings of 8th International IUFRO Wood Dry. Conf., Brasov, Romania, 2003, pp 159-163
  14. Sun, Z., Bannister, P., Carrington, C.G., Dynamic Modeling of the Wood Stack in a Wood Drying Kiln., J. Chemical Engineering Research & Design, 78 (2000), A1, pp. 107-117
  15. Koumoutsakos, A., Avramidis, S., Hatzikiriakos, S.G., Radio Frequency Vacuum Drying of wood: I. Mathematical model. Drying Technology 19 (2001), pp. 65-84
  16. Li, X.J., Zhang, B.J., Li, W.J. Microwave-Vacuum drying of wood: Model Formulation and Verification. Drying Technology 26 (2008), pp.1382-1387
  17. Moschler, W., Hanson, G.R., Microwave Moisture Measurement System for Hardwood Lumber Drying, Drying Technology 26 (2008), pp.1155-1159
  18. Hukka, A., Deformation Properties of Finnish Spruce and Pine Wood in Tangential and Radial Directions in Association to High Temperature Drying, Part III. Experimental Results Under Drying Conditions (Mechano-Sorptive Creep) J. Holz als Roh-und Werkstoff, 58 (2000), pp. 63-71
  19. Younsi, R., Kocaefe, D., Kocaefe, Y., Three-Dimensional Simulation of Heat and Moisture Transfer in Wood, Applied Thermal Engineering, 26 (2006), 11-12, pp. 1274-85
  20. Younsi, R., Kocaefe, D., Poncsak, S., Kocaefe, Y., Computational and Experimental Analysis of High Temperature Thermal Treatment of Wood Based on ThermoWood Technology, Int. Comm. in Heat and Mass Transfer, 13 (2010), 1, pp. 21-8
  21. Younsi, R., Kadem, S., Lachemet, A., Kocaefe, D., Transient Analysis of Heat and Mass Transfer During Heat Treatment of Wood Including Pressure Equation, Thermal Science., 2012 (in press)
  22. Younsi, R., Kocaefe, D., Poncsak, S., Kocaefe, Y., Transient Multiphase Model for the High Temperature Treatment of Wood, American Institute of Chemical Engineering., 52 (2006), 7, 2340-2349
  23. Comsol, Femlab AB. Version 2.0, reference manual, 2000
  24. Simpson, W., Tenwold, A., Physical Properties and Moisture Relations of Wood, in: Wood Handbook, USDA Forest service, forest product laboratory, Wisconsin,USA,1999
  25. Siau, JF., Transport processes in wood, Springer-Verlag, New York, USA, 1984
  26. Jia, D., Afzal, MT., Modeling the Heat and Mass Transfer in Microwave Drying of White Oak, Drying Technology. 26 (2008), 9, pp. 1103-1111

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence