NDLI: Heterogeneous Nucleation With Artificial Cavities

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Qi, Yusen James, F. Klausner
Copyright Year	2005
Abstract	Bubble incipience in artificial cavities manufactured from silicon has been studied using gas nucleation and pool boiling. Moderately wetting water and highly wetting ethanol have both been used as the bulk fluid with cylindrical cavities, as well as those with a triangle, square, and rectangle shape cross section. Nominal cavity sizes range from 8 to 60 μm. The incipience conditions observed for water using both gas nucleation and pool boiling suggest that bubble initiation originates from a concave meniscus. Cornwell’s contact angle hysteresis theory for vapor trapping cavities is used to explain the gas nucleation results. The pool boiling results are more difficult to explain. Using ethanol, cavities appeared to be completely flooded and were not activated using either gas nucleation or pool boiling. Using water and gas nucleation cavities were almost always activated, provided the incipience criterion was satisfied; in contrast cavities in pool boiling with water activated with different superheats during different experiments. The difference in incipience behavior between gas nucleation and pool boiling with water is explained based on vapor trapping and thermal suppression considerations. Based on limited experimental results, it appears that the backpressure does not influence gas bubble incipience, provided the pressure difference is the same. The experimental results presented affirm the theory of heterogeneous nucleation from vapor trapping cavities provided contact angle hysteresis and vapor trapping are fully accounted for. However, the results also suggest that the theoretical considerations required for a deterministic model for incipience from vapor trapping cavities during boiling is more complex than previously hypothesized.
Sponsorship	Heat Transfer Division and Electronic and Photonic Packaging Division
Starting Page	79
Ending Page	89
Page Count	11
File Format	PDF
ISBN	0791847322
DOI	10.1115/HT2005-72302
e-ISBN	0791837629
Volume Number	Heat Transfer: Volume 2
Conference Proceedings	ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
Language	English
Publisher Date	2005-07-17
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Water Ethanol Wetting Vapors Boiling Pressure Nucleation (physics) Cavities Bubbles Fluids Silicon Shapes Pool boiling
Content Type	Text
Resource Type	Article

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Photographic Study on Bubble Motion in Subcooled Pool Boiling

Sliding Bubble-Pumped Motion Induced by Surface Micro-Structure in Pool Boiling of a Dielectric Fluid Under Reduced Gravity

Experimental Evaluation of Pressure Drop Elements and Fabricated Nucleation Sites for Stabilizing Flow Boiling in Minichannels and Microchannels

Heterogeneous Nucleation With Artificial Cavities

Comparison of Gas Nucleation and Pool Boiling Site Densities

Mechanisms of Subcooled Pool Boiling CHFS Depending on Subcooling, Pressure, and Test Heater Configurations and Surface Conditions in Liquids

Boiling Investigation on a Surface With Artificial and Natural Nucleons Sites

Effect of Wettability on Pool Boiling Incipience in Saturated Water

Dynamics of Contact Angle During Growth and Liftoff of Bubbles at a Single Nucleation Site in Flow Boiling

Heterogeneous Nucleation With Artificial Cavities

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