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Water migration in poplar wood during microwave drying studied by time domain nuclear magnetic resonance (TD-NMR)

  • Xinyu Li , Yulei Gao , Minghui Zhang EMAIL logo , Ximing Wang and Xinyue Wei
Published/Copyright: July 12, 2017
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Abstract

The migration of bound water and free water has been investigated during microwave drying of wood by the time domain nuclear magnetic resonance (TD-NMR) technique. Both the heartwood (hW) and sapwood (sW) of Beijing poplar (Populus beijingensis W. Y. Hsu) and Qingpi poplar (Populus platyphylla T. Y. Sun) were studied. The microwave drying is characterized by a fast drying rate, and there is a linear relation between moisture content (MC) and microwave drying time (t). The drying rate of free water is about 2.7 times more rapid than that of bound water. The spin-spin relaxation time (T2) revealed that most of the water was free water situated in smaller pores. The irregular T2 signal amplitudes of free water in hWs indicated that fractional water in smaller pores was transferred into bigger pores during drying.

Acknowledgments

This research was supported by the National Natural Science Foundation of China (31160141/C1603), the China Scholarship Council and the Natural Science Foundation of Inner Mongolia (2015MS0351).

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Received: 2017-3-7
Accepted: 2017-5-19
Published Online: 2017-7-12
Published in Print: 2017-10-26

©2017 Walter de Gruyter GmbH, Berlin/Boston

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