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Effective thermal conductivity models applied to wood briquettes

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标题: Effective thermal conductivity models applied to wood briquettes
资源摘要: Publication date: February 2018
Source:International Journal of Thermal Sciences, Volume 124

Author(s): Daniela Sova, Mihaela Porojan, Bogdan Bedelean, Gabriela Huminic

Three electrical resistive-circuit models were used to determine the effective transverse and longitudinal thermal conductivity of a wood cell as a constituent element of briquettes chips. The models were applied to the briquettes at 0% moisture content and equilibrium moisture content. With the increase in moisture content above equilibrium moisture content, but below fiber saturation point, both fiber swelling and increase in chips interspaces occurred, so that a change in the cell geometry and model was necessary. Since the transverse series resistive model overestimated the thermal conductivity and the transverse parallel resistive model underestimated the thermal conductivity, the wood cells were combined into serial and parallel circuits until the difference between models became insignificant. General equations were developed in the paper, describing effective transverse thermal conductivity of combined cells. Experimental measurements of thermal conductivity significantly validated the resistive models.





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资源来源机构: Elsevier
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