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Title: A single cell model for pretreatment of wood by microwave explosion

Source: Holzforschung, Vol. 64, pp. 633-637, 2010

Author(s)Li, Xianjun; Zhou, Yongdong; Yan, Yonglin; Cai, Zhiyong; Feng, Fu

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-1A

Abstract: A theoretical model was developed to better understand the process of microwave explosion treatment of wood cells. The cell expansion and critical conditions concerning pressure and temperature of ray parenchyma cells in Eucalyptus urophylla were simulated during microwave pretreatment. The results indicate that longitudinal and circumferential stresses were generated in the cell walls owing to the internal steam pressure during extensive microwave treatment. The circumferential stress is twice as high as the longitudinal stress. The pressure difference reaches its maximum value of 0.84 MPa when the extension ratio is 1.20 for the longitudinal direction and 1.62 for the circumferential direction. The maximum pressure difference at the theoretical yielding point is the critical pressure difference that can eventually rupture the ray cell. The critical pressure difference decreases with increasing cell radius and decreasing shear modulus in the cell wall. This simulated result provides useful information to modify wood at the level of ray parenchyma cells.

Keywords: Microwave explosion, pretreatment, single cell model, wood, microwave drying, microwave heating, drying, modulus of elasticity, elasticity, plant cell walls, Eucalyptus, parenchyma, pressure, temperature, deformations, mathematical models, Eucalyptus urophylla, steam pressure

Publication Review Process: Formally Refereed

File size: 95 kb(s)

Date posted: 08/16/2010

This publication is also viewable on Treesearch:  view
RITS Product ID: 35591
Current FPL Scientist associated with this product
Cai, Zhiyong
Supervisory Research Materials Engineer
  

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