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Intensification of beech wood drying process using microwaves

Treść / Zawartość
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
This paper analyses the influence of the applied microwave power output on the intensification of drying in the context of process kinetics and product quality. The study involved testing samples of beech wood (Fagus sylvatica L.). Wood samples were dried in the microwave chamber at: 168 W, 210 W, 273 W, 336 W and 378 W power output level. For comparison, wood was dried convectively at 40 ◦C and 87% air relative humidity. The analysis of drying process kinetics involved nonlinear regression employing the Gompertz model. Dried samples were subjected to static bending tests in order to specify the influence of the applied microwave power on modulus of elasticity (MOE) and modulus of rapture (MOR). The obtained correlations of results were verified statistically. Analysis of drying kinetics, strength test results and Tukey’s test showed that the applied microwaves of a relatively low level significantly shortened the drying time, but did not cause a reduction in the final quality of dried wood, compared with conventional drying.
Rocznik
Strony
179–--187
Opis fizyczny
Bibliogr. 21 poz., rys., tab., wykr.
Twórcy
  • Poznań University of Technology, Faculty of Chemical Technology, ul. Berdychowo 4,60-965 Poznań, Poland
  • Poznań University of Life Sciences, Faculty of Land Reclamation and Environmental Engineering, ul. Piątkowska 94e, 60-649 Poznań, Poland
autor
  • Poznań University of Life Sciences, Faculty of Wood Technology, ul. Wojska Polskiego 38/42,61-627 Poznań, Poland
Bibliografia
  • 1. Antti A.L., Perré P., 1999. A microwave applicator for on line wood drying: Temperature and moisture distributionin wood.Wood Sci. Technol., 33, 2, 123–138. DOI: 10.1007/s002260050104.
  • 2. Brunner R., 1987.Die Schnittholztrocknung5. Auflage, Hannover.
  • 3. Forest Products Laboratory, 2010. Wood handbook – Wood as an engineering material. General Technical ReportFPL-GTR-190. U.S. Department of Agriculture, Forest Service, Forest Product Laboratory. Madison, WI, USA.
  • 4. Hansson L., Antii A.L., 2003. The effect of microwave drying on Norway spruce woods strength: a comparisonwith conventional drying. J. Mater. Process. Technol., 141, 41–50. DOI: 10.1016/S0924-0136(02)01102-0.
  • 5. Itaya Y., Uchiyama S., Hatano S., Mori S., 2004. Drying enhancement of clay slab by microwave heating. Dry.Technol., 23, 6, 1243–1255. DOI: 10.1081/DRT-200059487.
  • 6. Kneule F., 1975. Das Trocknen. Verlag Sauerländer, Frankfurt am Main.
  • 7. Lei L.Y., Zhang Y.L., Peng J., Li C., 2011. Microwave drying characteristics and kinetics of ilmenite.Trans.Nonferrous Met. Soc. China, 21, 202–207. DOI: 10.1016/S1003-6326(11)60700-0.
  • 8. Metaxas A.C., 1991. Microwave heating.Power Eng. J., 5, 237-247. DOI: 10.1049/pe:19910047.
  • 9. Mujumdar A.S. (Ed.), 2015.Handbook of industrial drying. 4 Ed. Taylor & Francis Group.
  • 10. Oloyede A., Groombridge P., 2000. The influence of microwave heating on the mechanical properties of wood.J. Mater. Process. Technol., 100, 67–73. DOI: 10.1016/S0924-0136(99)00454-9.
  • 11. Rajagopal K.R., Tao L., 2002. Modelling of the microwave drying process of aqueous dielectrics.Z. Angew. Math.Phys., 53, 923–948. DOI: 10.1007/PL00012620.
  • 12. Ratanadecho P., Aoki K., Akahoriu M., 2001. Experimental and numerical study of microwave drying in unsaturatedporous material.Int. Commun. Heat Mass Transf., 28, 5, 605–616. DOI: 10.1016/S0735-1933(01)00265-2.
  • 13. Ratanadecho P., Aoki K., Akahoriu M., 2002. Influence of irradiation time, particle sizes and initial moisturecontent during microwave drying of multi-layered capillary porous materials.J. Heat Transf., 124, 2, 151–161.DOI: 10.1115/1.1423951.
  • 14. Ratandecho P., 2006. The simulation of microwave heating of wood using a rectangular wave guide: Influence offrequency and sample size.Chem. Eng. Sci., 61, 4798–4811. DOI: 10.1016/j.ces.2006.03.001.
  • 15. Schiffmann R.F., 1987. Microwave and dielectric drying. In: AS Mujumdar (Ed.):Handbook of Industrial Drying.Marcel Dekker, New York.
  • 16. Seber G.A.F., Wild C.J., 2003.Nonlinear regression. John Wiley & Sons, Hoboken, New Jersey.
  • 17. Straže A., Pervan S., Gorišek Ž., 2010. Impact of various conventional drying conditions on drying rate and onmoisture content gradient during early stage of beech wood drying. Final Conference of Cost Action E53,TheFuture of Quality Control for Wood and Wood Products, Edinburgh 2010.
  • 18. Tinga W.R., Nelson S.O., 1973. Dielectric properties of materials for microwave processing – tabulated.J. Microw.Power, 8, 1, 23–65. DOI: 10.1080/00222739.1973.11689017.
  • 19. Zhang D., Mujumdar A.S., 1992. Deformation and stress analysis of porous capillary bodies during intermittentvolumetric thermal drying.Dry. Technol., 10, 2, 421–443. DOI: 10.1080/07373939208916444.
  • 20. Zielonka P., Gierlik E., Matejak M., Dolowy K., 1997. The comparison of experimental and theoretical temperaturę distribution during microwave wood heating.Holz Roh Werkst., 55, 395–398. DOI: 10.1007/s001070050253.
  • 21. Wei Ch.K., Davis H.T., Davis E.A., Gordon J., 1985. Heat and mass transfer in water-laden sandstone: Microwaveheating.AIChE J., 31, 5, 842–848. DOI: 10.1002/aic.690310521.
Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-c3986a0d-0308-4bd4-bd66-22f727bc07d3
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