NDLI: Transient Natural Convection Slip Flow in a Vertical Microchannel Heated at Uniform Heat Flux

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Buonomo, Bernardo Manca, Oronzio
Copyright Year	2008
Abstract	Miniaturization of devices has received a rapid expansion in the last years and a great attention of research activities is given to microflow due to its new applications of microfluidic systems and components. In the present paper a transient investigation on natural convection in parallel-plate vertical microchannels is carried out numerically. The vertical microchannel is considered asymmetrically or symmetrically heated at uniform heat flux. The first-order model for slip velocity and jump temperature is assumed in microscale conditions. The analysis is performed in laminar boundary layer assumption for different values for different values of Knudsen number, Rayleigh number and the ratio of wall heat flux in order to evaluate their effects on wall temperatures, mass flow rate and Nusselt number. Wall temperature overshoots are detected for the different conditions. These values increase increasing the Knudsen number, Kn, at high Rayleigh number, Ra, whereas for lower Ra the lowest wall temperature are obtained for Kn = 0.05. Mass flow rate increases increasing Kn whereas Nusselt number decreases increasing Kn.
Sponsorship	Heat Transfer Division
Starting Page	613
Ending Page	624
Page Count	12
File Format	PDF
ISBN	9780791848470
DOI	10.1115/HT2008-56359
e-ISBN	0791838323
Volume Number	Heat Transfer: Volume 1
Conference Proceedings	ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Slip flow Temperature Microscale devices Natural convection Rayleigh number Flow (dynamics) Heat flux Microchannels Transients (dynamics) Wall temperature Knudsen number Boundary layers Microfluidics
Content Type	Text
Resource Type	Article

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