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Second law analysis for extended graetz problem including viscous dissipation in microtubes

Sadeghi, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1115/FEDSM-ICNMM2010-31069
  3. Publisher: 2010
  4. Abstract:
  5. The entropy generation rate has become a useful tool for evaluating the intrinsic irreversibilities associated with a given process or device. This work presents an analytical solution for entropy generation in hydrodynamically fully developed thermally developing laminar flow in a microtube. The rarefaction effects as well as viscous heating effects are taken into consideration, but axial conduction is neglected. Using fully developed velocity profile, the energy equation is solved by means of integral transform. The solution is validated by comparing the local Nusselt numbers against existing literature data. From the results it is realized that the entropy generation decreases as Knudsen number increases, while the effect of increasing values of Brinkman number and the ratio of Brinkman number to dimensionless temperature difference is to increase entropy generation. The average entropy generation number over the cross section of channel increases with increasing values of axial coordinate, until it reaches a constant value at fully developed conditions
  6. Keywords:
  7. Bejan ; Entropy generation ; Graetz problem ; Knudsen number ; Microtube ; Slip flow ; Viscous dissipation ; Graetz problem ; Knudsen numbers ; Forced convection ; Integral equations ; Laminar flow ; Microchannels ; Nusselt number ; Viscous flow ; Entropy
  8. Source: ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2010 Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, Montreal, QC, 1 August 2010 through 5 August 2010 ; Issue PARTS A AND B , 2010 , Pages 503-514 ; 9780791854501 (ISBN)
  9. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1621473