Title page for ETD etd-91597-19239


Type of Document Master's Thesis
Author Gu, Hong-mei
Author's Email Address hongmeig@vt.edu
URN etd-91597-19239
Title Moisture Gradient Measurement During Kiln Drying of Red Oak
Degree Master of Science
Department Wood Science and Forest Products
Advisory Committee
Advisor Name Title
Zink-Sharp, Audrey G. Committee Chair
Lamb, Fred M. Committee Member
Youngs, Robert L. Committee Member
Keywords
  • thickness
  • flake
  • slice
  • moisture gradient
  • radial
  • tangential
Date of Defense 1997-09-29
Availability unrestricted
Abstract
The key to improving drying quality and reducing drying time and energy consumption lies in understanding and controlling moisture movement during drying. As wood dries, strains and stresses develop as a result of restraints imposed by moisture gradients and differential shrinkage in wood. So accurately measuring the moisture gradient in wood during drying will be helpful to improving drying quality.

In this project, moisture gradients in red oak will be measured through four different techniques----bandsaw slicing, Forstner bit layering, flaking and razor blade slicing. The first two techniques are found in the literature. The last two are developed in this study. The results obtained with these four techniques were compared, and it was found that the newly developed techniques could get moisture gradients that were closer to the true value.

The thickness of the slice was assumed to affect measuring the moisture gradient because of the environmental influences. So a thickness series was tested with the two new technique----flaking and razor blade slicing. The results showed that there was no slice or flake thickness effect on the moisture gradients.And an optimum slice and flake thickness was determined for the wood industries and research studies.

Finally, the directional effect on transverse moisture movement during kiln drying was examined through measuring moisture gradients in the tangential and radial directions of wood. The results showed that moisture moved slightly faster in the radial direction than in the tangential direction during kiln drying and the moisture gradients in the tangential direction were slightly steeper than those in the radial direction.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Bandsaw.pdf 328.05 Kb 00:01:31 00:00:46 00:00:41 00:00:20 00:00:01
  Chp1.pdf 31.30 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01
  Chp2.pdf 221.29 Kb 00:01:01 00:00:31 00:00:27 00:00:13 00:00:01
  Chp3.pdf 45.56 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01
  Chp4.pdf 10.51 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Fig3-22.pdf 10.89 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Flake.pdf 311.20 Kb 00:01:26 00:00:44 00:00:38 00:00:19 00:00:01
  Forstner.pdf 356.87 Kb 00:01:39 00:00:50 00:00:44 00:00:22 00:00:01
  Frontpag.pdf 18.82 Kb 00:00:05 00:00:02 00:00:02 00:00:01 < 00:00:01
  Razor.pdf 244.35 Kb 00:01:07 00:00:34 00:00:30 00:00:15 00:00:01
  Referenc.pdf 9.91 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Table3-3.pdf 21.80 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01
  Table3-4.pdf 24.14 Kb 00:00:06 00:00:03 00:00:03 00:00:01 < 00:00:01
  Test1.pdf 219.06 Kb 00:01:00 00:00:31 00:00:27 00:00:13 00:00:01
  Test2.pdf 252.28 Kb 00:01:10 00:00:36 00:00:31 00:00:15 00:00:01
  Test3.pdf 124.68 Kb 00:00:34 00:00:17 00:00:15 00:00:07 < 00:00:01
  Titlpag.pdf 3.61 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01
  Vita.pdf 3.19 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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