Discuss the different types of pool boiling phenomena. Describe the different behavior regions associated with pool-boiling in...

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Mechanical Engineering

Discuss the different types of pool boiling phenomena.
Describe the different behavior regions associated withpool-boiling in terms of excess temperature.
Describe the differences, if any, between burn-out point andLeidenfrost point for pool boiling.
For pool boiling, which thermo-physical variable needs to becontrolled to obtain a continuous curve in the heat flux vs. excesstemperature plot?
Discuss at which point does nucleate boiling regime starts andends.
Describe the reason(s) for lower heat transfer coefficientsrelative to natural convection when excess temperature exceeds theburn-out point in a heat vs. excess temperature plot.
Discuss the reason(s) why quality is relevant during operationof power plant low pressure turbines.

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4.1 Ratings (742 Votes)

Different types stages of pool boiling phenomenaareFour boiling regimes are seen in the pool boiling phenomenaThese areNatural convection regimeNucleate regimeTransition regimeFilm boiling regimeNote In the diagram approximately 5oC isdenoted by 5oC It is not to be confused with minusor 5oC For example transition boiling starts atapproximately 30oC or 30oC and ends atroughly 120oC1 Natural convection boiling Theoretically boiling starts assoon as the fluid reaches its saturation temperature However inreality it needs some further temperature for boiling to beactually started For water this excess temperature isapproximately 2oC to 6oC In this conditionwe can observe that the bubbles are gradually beginning to formThis is natural convection boiling in which we observe the bubblesbeginning to form Bubbles are an intrinsic part of pool boilingAll the heat transfer occurring in this stage is via naturalconvection currents only This stage See Answer

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