Combined influences of viscous dissipation, non-uniform Joule heating and variable thermophysical properties on convective heat transfer in microtubes

2012 ◽  
Vol 55 (4) ◽  
pp. 762-772 ◽  
Author(s):  
Hadi Yavari ◽  
Arman Sadeghi ◽  
Mohammad Hassan Saidi ◽  
Suman Chakraborty
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Viscous Dissipation ◽  
Convective Heat ◽  
Joule Heating ◽  
Thermophysical Properties

Effects of Creep Flow and Viscous Dissipation in the Slip Regime for Isoflux Rectangular Microchannels

2007 ◽  
Author(s):  
Jennifer van Rij ◽  
Tim Ameel ◽  
Todd Harman
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Pressure Drop ◽  
Convective Heat Transfer ◽  
Viscous Dissipation ◽  
Convective Heat ◽  
Numerical Algorithm ◽  
Slip Flow ◽  
Creep Flow ◽  
Nusselt Numbers

The effects of rarefaction on convective heat transfer and pressure drop characteristics are numerically evaluated for uniform wall heat flux rectangular microchannels. Results are obtained by numerically solving the momentum and energy equations with both first- and second-order slip velocity and temperature jump boundary conditions. The resulting velocity and temperature fields are then evaluated to obtain the microchannel Poiseuille and Nusselt numbers. In addition to the effects of rarefaction, the effects of aspect ratio, thermal creep flow, and viscous dissipation are investigated for locally fully developed Poiseuille and Nusselt numbers. The constant wall heat flux results obtained in this study are compared to constant wall temperature results obtained previously, using the same numerical algorithm, at various aspect ratios including the limiting case of parallel plate microchannels. In addition to supplying previously unreported data on slip flow convective heat transfer and pressure drop characteristics, these results verify the numerical algorithm for more complex future slip flow analyses.

scholarly journals Numerical investigation on natural convective heat transfer of Al2O3-water nanofluids (About the effect of thermophysical properties)

2016 ◽  
Vol 82 (840) ◽  
pp. 16-00153-16-00153 ◽  
Author(s):  
Masato AKAMATSU ◽  
Takuto KAMEYAMA ◽  
Yuki YOMOGITA ◽  
Mitsuo IWAMOTO ◽  
Hiroyuki OZOE
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Numerical Investigation ◽  
Convective Heat ◽  
Thermophysical Properties
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