nucleate boiling


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nucleate boiling

[′nü·klē‚āt ′bȯil·iŋ]
(chemical engineering)
Boiling in which bubble formation is at the liquid-solid interface rather than from external or mechanical devices; occurs in kettle-type and natural-circulation heaters or reboilers.
References in periodicals archive ?
Nucleate boiling was significant in R32 and R410A for the whole quality range.
Micro- and nanostructures on a dull surface increase the number of nucleation sites, reduce the onset of nucleate boiling, and change a single-phase region into a two-phase region, all of which contribute to nucleate boiling [10].
An innovative control strategy, which is based on the Robust Model Predictive Control (MPC) methodology, was developed with the purpose of optimizing the engine thermal management; the proposed control strategy adjusts the coolant flow rate by means of an electric pump, in order to bring the cooling system to operate around the onset of nucleate boiling.
Bubble growth is mainly controlled by the momentum exchange between liquid and bubble after nucleate boiling being started on heated surface then the bubble growth is due to evaporation through liquid vapor interface.
The contributors investigate radiative heat transfer across molten mold flux film during the continuous casting of steels, the influence of microstructures on nucleate boiling processes, carbon nanotubes suspended in ethylene glycol yield nanofluids, waste energy recovery in a diesel engine exhaust system, the efficacy of greenhouse gas forcing and solar forcing, and energy balance within an unmanned air vehicle wing fuel tank.
Among these are the mechanism of film and nucleate boiling processes, calculating the duration of the transient nucleate boiling mode, the accuracy of cooling curves and cooling rate measurements, the results of investigations based on using noise control systems, and the real and effective heat transfer coefficients.
2]K) X quality (-) x assumed temperature difference from ambient D diameter (m) Subscripts SH super heat SC sub cooling cri critical c condenser , cold , convective h hot, Specific enthalpy p at constant pressure m mean min minimum max maximum ref refrigerant act actual evap evaporator cond condenser e evaporator c condenser tp two phase l liquid g vapour ncb nucleate boiling s surface, secondary w wall r reduced property o outer i inner in inlet w wall HTF secondary heat transfer fluid
The design constraint for pressurized water reactors was that there would be nucleate boiling or the formation of little steam bubbles on the surface of the fuel to enhance heat transfer, but no bulk boiling of the water.
Presented investigation treats convective effects of ebullition cycle in a partial nucleate boiling regime.
This phenomenon is called nucleate boiling, and the coolant is operating at peak efficiency at this stage.