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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

TRANSIENT GROWTH OF BUBBLES IN SATURATION BOILING OF PF-5060 DIELECTRIC LIQUID ON ROUGH SURFACES

DOI: 10.1615/TFESC1.hte.012541
pages 1487-1491

Arthur Suszko
Institute for Space and Nuclear Power Studies, Mechanical Engineering Dept., University of New Mexico, Albuquerque, NM, USA

Mohamed S. El-Genk
Institute for Space and Nuclear Power Studies; Mechanical Engineering Department; Nuclear Engineering Department, Chemical & Biological Engineering Dept., University of New Mexico, Albuquerque, New Mexico, 87131 USA


KEY WORDS: rough Cu, nucleate boiling, transient bubble growth, PF-5060 dielectric liquid

Abstract

Experiments are performed to investigate the transient growth of discrete bubbles in saturation nucleate boiling of PF-5060 dielectric liquid on 10×10 mm uniformly heated smooth (Ra = 0.039 μm) and rough (Ra = 0.21-1.79 μm) Copper (Cu) surfaces. Images of growing discrete bubbles, at an applied surface heat flux of ~ 0.5 W/cm2, are captured using high speed video camera at 210 frames per second (fps). On smooth Cu, the determined bubble departure diameter and detachment frequency are 655±53 μm and 31±4 Hz. The bubble departure diameter and detachment frequency on the rough surfaces of 438±36 μm and 38±3 Hz, respectively, are of surface roughness.

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