Heat transfer coefficient of flowing wood pulp fibre suspensions to monitor fibre and paper quality

Kazi, S.N. and Duffy, G.G. and Chen, X.D. (2015) Heat transfer coefficient of flowing wood pulp fibre suspensions to monitor fibre and paper quality. Applied Thermal Engineering, 78. pp. 172-184. ISSN 1359-4311,

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Heat transfer measurements were obtained for a range of suspensions of wood pulp fibre flowing through a pipeline. Data were generated over a selected range of flow rates and temperatures from a specially built flow loop. It was found that the magnitude of the heat transfer coefficient was above water at equivalent experimental conditions at very low fibre concentrations, but progressively decreased until it was below water at slightly higher concentrations. It was found that the heat transfer was affected by varying fibre properties, such as fibre length, fibre flexibility, fibre chemical and mechanical treatment, the variation of fibres from different parts of the tree as well as the different pulping methods used to liberate the fibres from the wood structure. Heat transfer coefficient was decreased with the increasing of fibre flexibility as found by previous workers. In the present investigation properties of fibre and paper are correlated with heat transfer to suspensions of fibres. Variations in fibre characteristics can be monitored in flowing suspension of fibres by measuring heat transfer coefficient and using those measurements to adjust the degree of fibre refining treatment so that papers made from those fibres are more uniform, more consistent and within product specification. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: High Impact Research Grant UM.C/625/1/HIR/MOHE/ENG/45 , UMRG Grant RP012D-13AET, Faculty of Engineering, University of Malaya, Malaysia , University of Auckland, New Zealand
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Uncontrolled Keywords: Pressure drop, Heat transfer, Wood pulp fibre, Fibre concentration, Fibre flexibility, TURBULENT-FLOW, DRAG REDUCTION, MOTION,
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 22 Sep 2015 00:20
Last Modified: 22 Sep 2015 00:20
URI: http://eprints.um.edu.my/id/eprint/14007

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