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NUMERICAL STUDY OF MICROCONVECTIVE WATER-FLOW CHARACTERISTICS WITH VARIATIONS IN PROPERTIES

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Title NUMERICAL STUDY OF MICROCONVECTIVE WATER-FLOW CHARACTERISTICS WITH VARIATIONS IN PROPERTIES
 
Creator GULHANE, NP
MAHULIKAR, SP
 
Subject LAMINAR MICRO-CONVECTION
PHASE HEAT-TRANSFER
FORCED-CONVECTION
GAS PROPERTIES
MICROCHANNELS
TUBE
CHANNELS
LIQUIDS
FLUX
friction factor
pressure drop
microscale
property variations
 
Description A numerical program is developed to solve two-dimensional continnum-based governing differential equations for liquid flow in axisymmetric circular microchannel geometry. The effects of variable thermal properties in single-phase laminar forced convection with constant wall heat flux boundary conditions are studied. The numerical analysis of fully developed flow behavior investigates the effect of rho(T), mu(T), and k(T) on convection and friction characteristics in isolation and in combination. For the case of heated water, mu(T) variation and k(T) variation increases the Nusselt number due to the following effects: (1) nonnegligible radial convection causes flattening of the axial velocity profile, (2) reduction in wall temperature and axial bulk mean fluid temperature causes significant axial conduction along the flow. The effect of.(T) and mu(T) variation on friction is indirect as follows: the viscosity gradient and shear stress at the wall reduce along the flow; therefore, the Poiseuille number deviates from constant properties solution (Po = 64). The investigations also showed that pressure drop significantly differs at the microscale compared to the macroscale.
 
Publisher TAYLOR & FRANCIS INC
 
Date 2012-06-26T10:01:57Z
2012-06-26T10:01:57Z
2011
 
Type Article
 
Identifier NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING,15(1)28-47
1556-7265
http://dx.doi.org/10.1080/15567265.2010.549928
http://dspace.library.iitb.ac.in/jspui/handle/100/14354
 
Language English