Bubble Ebullition on a Hydrophilic Surface

[+] Author and Article Information
Aritra Sur

University of Houston, Houston, TX 77204

Yi Lu

University of Houston, Houston, TX 77204

Carmen Pascente

University of Houston, Houston, TX 77204

Paul Ruchhoeft

University of Houston, Houston, TX 77204

Dong Liu

University of Houston, Houston, TX 77204

Corresponding author.

J. Heat Transfer 137(2), 020905 (Feb 01, 2015) Paper No: HT-14-1604; doi: 10.1115/1.4029015 History: Received September 09, 2014; Revised September 24, 2014; Online November 25, 2014


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.

Copyright © 2014 by ASME
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