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. Multi-pass exchangers (S&T). 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) 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 between wall & boiling point of liquid. Heat-transfer coefficient = ratio of heat flux to 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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