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Bubble Ebullition on a Hydrophilic Surface

[+] Author and Article Information
Aritra Sur

University of Houston, Houston, TX 77204
asur2@Central.UH.EDU

Yi Lu

University of Houston, Houston, TX 77204
luyistudent@gmail.com

Carmen Pascente

University of Houston, Houston, TX 77204
carmenpascente@gmail.com

Paul Ruchhoeft

University of Houston, Houston, TX 77204
pruchhoeft@uh.edu

Dong Liu

University of Houston, Houston, TX 77204
dongliu@uh.edu

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

Abstract

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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