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Research Papers

Heat Transfer in Hot Pressing of Saturated Fiber Suspensions

[+] Author and Article Information
Reza H. Khiabani

G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332khiabani@gatech.edu

Yogendra Joshi

G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332yogendra.joshi@me.gatech.edu

Cyrus K. Aidun

G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332cyrus.aidun@me.gatech.edu

J. Thermal Sci. Eng. Appl 2(4), 041009 (Feb 24, 2011) (7 pages) doi:10.1115/1.4003509 History: Received October 04, 2010; Revised January 12, 2011; Published February 24, 2011; Online February 24, 2011

This paper presents a three-dimensional numerical framework based on lattice Boltzman method combined with the energy equation for predicting the thermal properties of saturated fiber networks. Heat transfer in fiber suspensions during hot pressing in paper making process is investigated. The effects of efficient preheating on overall energy savings are discussed. The accuracy of the analytical solution based on the assumption of semi-infinite solid body is also investigated. The results show that the thermal properties change significantly depending on the wood fiber types. The effective thermal conductivities of fiber suspensions for three different fiber types are calculated. The predictions compare well with existing experimental and analytical data.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Different sections in paper making machine

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Figure 2

Schematic of hot pressing of fiber suspension

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Figure 3

Temperature in paper sheet at 2/3 of caliper, Tw=100°C

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Figure 4

Temperature in paper sheet at 2/3 of caliper, Tw=150°C

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Figure 5

Temperature in paper sheet at 1/3 of caliper, Tw=150°C

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Figure 6

Temperature in Swedish softwood pulp paper sheet, Tw=100°C

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Figure 7

Temperature in Swedish softwood pulp paper sheet, Tw=150°C

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Figure 8

Temperature in southern pine paper sheet, Tw=100°C

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Figure 9

Temperature in southern pine paper sheet, Tw=150°C

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Figure 10

Effect of MR on keff

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Figure 11

Effect of solids on keff

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Figure 12

Effect of temperature on keff

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Figure 13

Effect of Swedish softwood pulp consistency and temperature on keff

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Figure 14

Nondimensional temperature in a paper with c=180 μm

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Figure 15

Nondimensional temperature at unheated surface

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Figure 16

Nondimensional temperature at unheated surface for Swedish softwood pulp at BW=120 g/m2

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