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ISSN Druckformat: 1099-2391
ISSN Online: 2641-7359
NUSSELT NUMBER VARIATION IN MICROCHANNELS
ABSTRAKT
Laminar, gaseous flow convective heat transfer in rectangular, parallel plates and circular microchannels is analyzed using the integral transform technique. The slip flow regime is considered. The Nusselt number variation with the Knudsen number is given to show the effects of rarefaction on heat transfer. As the Knudsen number increases, the Nusselt number decreases for all geometries. Between the limits of the slip flow regime, 0 < Kn ≤ 0.12, a reduction of 30−40% in the Nusselt number is observed. Viscous heating is found to be important. A positive Brinkman number will increase the Nusselt number for a uniform temperature and decrease it for a uniform heat flux boundary condition.
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Cotta R.M., Kakaç S., Mikhailov M.D., Castellões F.V., Cardoso C.R., Transient Flow and Thermal Analysis in Microfluidics, in Microscale Heat Transfer Fundamentals and Applications, 193, 2005. Crossref