NDLI: Nucleate Boiling From Micro-Machined Surfaces

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Adrian, M. Holland Colin, P. Garner
Copyright Year	2003
Abstract	This paper discusses the production and use of laser-machined surfaces that provide enhanced nucleate boiling and heat transfer characteristics. The surface features of heated plates are known to have a significant effect on nucleate boiling heat transfer and bubble growth dynamics. Nucleate boiling starts from discrete bubbles that form on surface imperfections, such as cavities or scratches. The gas or vapours trapped in these imperfections serve as nuclei for the bubbles. After inception, the bubbles grow to a certain size and depart from the surface. In this work, special heated surfaces were manufactured by laser machining cavities into polished aluminium plates. This was accomplished with a Nd:YAG laser system, which allowed drilling of cavities of a known diameter. The size range of cavities was 20 to 250 micrometers. The resulting nucleate pool boiling was analysed using a novel high-speed imaging system comprising an infrared laser and high resolution CCD camera. This system was operated up to a 2 kHz frame rate and digital image processing allowed bubbles to be analysed statistically in terms of departure diameter, departure frequency, growth rate, shape and velocity. Data was obtained for heat fluxes up to 60 kW.m−2. Bubble measurements were obtained working with water at atmospheric pressure. The surface cavity diameters were selected to control the temperature at which vapour bubbles started to grow on the surface. The selected size and spacing of the cavities was also explored to provide optimal heat transfer.
Sponsorship	Heat Transfer Division
Starting Page	555
Ending Page	559
Page Count	5
File Format	PDF
ISBN	0791836940
DOI	10.1115/HT2003-47414
e-ISBN	0791836797
Volume Number	Heat Transfer: Volume 2
Conference Proceedings	ASME 2003 Heat Transfer Summer Conference
Language	English
Publisher Date	2003-07-21
Publisher Place	Las Vegas, Nevada, USA
Access Restriction	Subscribed
Subject Keyword	Drilling Water Nd-yag lasers Temperature Atmospheric pressure Image processing Aluminum Micromachining Machining Polishing Nucleate pool boiling Cavities Bubbles Heat Lasers Dynamics (mechanics) Imaging Plates (structures) Nucleate boiling Flux (metallurgy) Resolution (optics) Shapes Heat transfer
Content Type	Text
Resource Type	Article

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Nucleate Boiling From Micro-Machined Surfaces

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