NDLI: Jet Impingement Heat Transfer Using Air-Laden Nanoparticles With Encapsulated Phase Change Materials

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chow, L. C. Su, M. Kizito, J. P. Hong, Y. Ding, S. J. Wu, W. Bostanci, H.
Copyright Year	2013
Abstract	Nanoparticles made of polymer encapsulated phase change materials (PCM) are added in air to enhance the heat transfer performance of air jet impingement flows applied to cooling processes. Encapsulation prevents agglomeration of the PCM (paraffin) nanoparticles when they are in the liquid phase. The sizes of the particles are chosen to be small enough so that they maintain near velocity equilibrium with the air stream. Small solid paraffin particles can absorb a significant amount of energy rapidly from a heat source by changing phase from solid to liquid. Nanoparticle volume fraction is found to play an important role in determining the overall pressure drop and heat transfer of the jet impingement process. Specifically, air jets laden with 2.5% particulate volume fraction were shown to improve the average heat transfer coefficient by 58 times in the air flow speed range of 4.6 to 15.2 m/s when compared to that of pure air alone. In addition, the structural integrity of the encapsulating shells was demonstrated to be excellent by the repeated use of the nanoparticles in closed loop testing.
Starting Page	052202
Ending Page	052209
Page Count	8
File Format	PDF
ISSN	00221481
e-ISSN	15288943
Journal	Journal of Heat Transfer
Volume Number	135
Issue Number	5
DOI	10.1115/1.4023563
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2013-04-12
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flow (Dynamics) Heat Heat transfer Heat transfer coefficients Nanoparticles Paraffin wax Particulate matter Phase change materials Polymers Pressure drop Temperature
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science

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