papr18 - Paper Machine Dry-end Lecture 17 PAPR 1000...

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1 Paper Machine Dry-end Lecture 17 PAPR 1000 Introduction to Pulp and Paper Manufacturer
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2 Drying ± Last step in water removal process ± Hydrogen bonding of fiber to fiber give paper its’ strength
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3 Mechanisms of Heat Transfer ± There are three ways that heat may be transferred between substances at different temperatures: 1. Conduction 2. Convection 3. Radiation
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4 Conduction ± The flow of heat by conduction occurs via collisions between atoms and molecules in the substance and the subsequent transfer of kinetic energy. ± Heat Flow (Q) ± Where k = thermal conductivity, A = area, L= thickness, T= temperature difference L T kA t Q Δ Δ =
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5 Convection ± Convection is the flow of heat through a bulk, macroscopic movement of matter from a hot region to a cool region, as opposed to the microscopic transfer of heat between atoms involved with conduction. ± Convection Convection is heat transfer between a surface and a gas. ± Example: Hot air drying ovens
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6 Radiation ± Radiation is the transfer of heat in the form of electromagnetic waves.
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papr18 - Paper Machine Dry-end Lecture 17 PAPR 1000...

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