NDLI: A Visualization Study of Heterogeneous Condensation on Nano-Particles in a Fully Saturated Microchannel

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Son, Sang Young
Copyright Year	2005
Abstract	The high heat transfer rate and compactness of micro/minichannel mutiphase flow system associated with phase change phenomena have been increasingly attractive in thermal management and microfluidic sensor development for applications which demand requirements such as small, light, and efficient systems. In this paper, quarts square microchannels with a hydraulic diameter of 1000 μm and a length of 20 mm are used for the path of fully saturated forced convection air flow with nano-particles (Θ ~ 100 nm). The outside of microchannel wall is cooled by natural convection of room air. Two distinctive heterogeneous condensation modes are observed as of droplet condensation on the channel wall and nano-particle nucleate condensation in the core air stream. At the exit of microchannel, liquid droplets with an order of micrometer diameter are observed by microscopic visualization using Nd:YAG (532 nm) Laser sheet illumination. The droplet growth visualization data show a influence of gas mixture mass flux, local vapor concentration, and wall surface condition either on wall droplet condensation and nucleate condensation droplet.
Sponsorship	Heat Transfer Division
Starting Page	679
Ending Page	683
Page Count	5
File Format	PDF
ISBN	0791842223
DOI	10.1115/IMECE2005-82421
e-ISBN	0791837696
Volume Number	Heat Transfer, Part B
Conference Proceedings	ASME 2005 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2005-11-05
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Visualization Forced convection Vapors Natural convection Condensation Flow (dynamics) Microchannels Nanoparticles Air flow Lasers Drops Thermal management Sensors Heat transfer Microfluidics
Content Type	Text
Resource Type	Article

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