3013-11 Lecture 20 - Heat Transfer with Phase Change-Condensation

3013-11 Lecture 20 - Heat Transfer with Phase Change-Condensation

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CHE 3013 – Fall 11 1 of 2 Smay Lecture 20 Heat Transfer with Phase Change – Condensation Assignments None Assigned Reading Chapter 10, Incropera et al., Sections 10.6 and 10.12 Handouts (on D2L unless stated otherwise) None Outline 1. Modes of condensation 2. Driving forces and resistances 3. Filmwise condensation 4. Dropwise condensation 5. Vapor-shear controlled condensation 6. Effects of non-condensables Key Concepts 1. Liquid condensate surface is in equilibrium with saturated vapor. 2. Resistance to heat transfer occurs across condensate film. 3. Filmwise condensation is usually assumed for condenser design. 4. Rules of thumb:
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Unformatted text preview: a. h horizontal tube > h vertical tube . b. Vertical tubes are preferred for subcooling. c. Vapors with non-condensables (air, N 2 , etc.) should be condensed inside tubes due to beneficial sweep effect (vapor shear). 5. Saturation temperature is a function of pressure. 6. If P sat increases, T sat increases. Key Skills 1. Explain modes of condensation. 2. Explain practical limitations of dropwise condentation. 3. Explain the effects of vapor shear on condenser design and operation. 4. Explain the effects of non-condensables on condenser design and operation. CHE 3013 – Fall 11 2 of 2 Smay...
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This note was uploaded on 10/11/2011 for the course CHE 3013 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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3013-11 Lecture 20 - Heat Transfer with Phase Change-Condensation

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