Nucleate boiling heat transfer depends on various aspects of the bubble ebullition, such as the bubble nucleation, growth and departure. In this work, a synchronized high-speed optical imaging and infrared (IR) thermography approach was employed to study the ebullition process of a single bubble on a hydrophilic surface. The boiling experiments were conducted at saturated temperature and atmospheric pressure conditions. De-ionized (DI) water was used as the working fluid. The boiling device was made of a 385-um thick silicon wafer. A thin film heater was deposited on one side, and the other side was used as the boiling surface. The onset of nucleate boiling (ONB) occurs at a wall superheat of ΔTsup= 12 °C and an applied heat flux of q" = 35.9 kW/m2. The evolution of the wall heat flux distribution was obtained from the IR temperature measurements, which clearly depicts the existence of the microlayer near the three-phase contact line of the nucleate bubble. The results suggest that, during the bubble growth stage, the evaporation in the microlayer region contributes dominantly to the nucleate boiling heat transfer; however, once the bubble starts to depart from the boiling surface, the microlayer quickly vanishes, and the transient conduction and the microconvection become the prevailing heat transfer mechanisms.
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February 2015
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Bubble Ebullition on a Hydrophilic Surface
Paul Ruchhoeft
Paul Ruchhoeft
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Aritra Sur
Yi Lu
Carmen Pascente
Paul Ruchhoeft
Corresponding author.
J. Heat Transfer. Feb 2015, 137(2): 020905
Published Online: February 1, 2015
Article history
Received:
September 9, 2014
Revised:
September 24, 2014
Online:
November 25, 2014
Citation
Sur, A., Lu, Y., Pascente, C., and Ruchhoeft, P. (February 1, 2015). "Bubble Ebullition on a Hydrophilic Surface." ASME. J. Heat Transfer. February 2015; 137(2): 020905. https://doi.org/10.1115/1.4029015
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