The formation and rise of the bubbles and the liquid entrainment coupled with the large amount of heat absorbed during liquid-vapor phase change at essentially constant temperature are responsible for the extremely high heat transfer coefficients associated with nucleate boiling. Nucleate boiling is a type of boiling which occurs when the surface temperature is hotter than the saturated fluid temperature by a certain amount. In this type of boiling, the heat flux is below the critical heat flux. Onset of Nucleate Boiling (ONB) is defined as the first location on the heated surface where a bubble can exist. In the presented casework boiling was simulated for two different cases in ANSYS Fluent using the RPI Boiling Model & the k-w SST Turbulence Model to study if departure from nucleate boiling will occur or not at two different heat fluxes on the pipe.
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