Microsoft PowerPoint - Introduction To Heat BOILing

Microsoft PowerPoint - Introduction To Heat BOILing -...

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Introduction To Heat Boiling Course By : Prof. Mohajer prepared by: S.M. rafigh 2011
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Components of Course: What Stage are We Up To? Types of exchangers, revision of OHTCs, fouling factors. Heat exchanger selection. Thermal performance analysis (NTUs) for co- & counter-current exchangers. Condensation & boiling . Radiation.
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Outline Important for reboilers on distillation columns, steam boilers Mechanisms Example
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Mechanisms Consider (first) situation in which wall temperatures are controlled (by condensing steam or other vapour) ifferent to controlled heat flux (controlled by Different to controlled heat flux (controlled by electrical, radiant, nuclear power input)
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As Wall Temperature is Increased Temperature driving force for boiling is that Heat-transfer coefficient = ratio of heat flux to mperature driving force. temperature driving force. Initially, only forced convection heating occurs; not boiling heat transfer
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Two Basic Mechanisms Nucleate boiling : strings of bubbles rise from surface; liquid moves into surface; more vapour generated
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Film boiling : at higher heat fluxes, vapour blankets surface, heat-transfer coefficient decreases
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Microsoft PowerPoint - Introduction To Heat BOILing -...

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