Loading...

Thermodynamic analysis of slip flow forced convection through a microannulus

Sadeghi, A ; Sharif University of Technology | 2010

1024 Viewed
  1. Type of Document: Article
  2. DOI: 10.2514/1.48036
  3. Publisher: 2010
  4. Abstract:
  5. The present investigation is devoted to the second law of thermodynamics analysis of steady-state hydrodynamically and thermally fully developed laminar gasflow in a microannulus with constant but different wall heat fluxes. Slip velocity and temperature jump boundary conditions are usedtodescribe rarefaction effects. Viscous heating is also included for both the wall cooling and heating cases. Using already available velocity profile, closedform expressions are obtained for the transverse distribution of temperature and entropy generation rates. The results demonstrate that the effectof the wall heatfluxes ratioonentropy generation is negligible atlarge valuesofthe group parameter and Peclet number, while the effect of increasing valuesof the annulus geometrical aspect ratio isto severely increase entropy generation. The entropy generation decreases as Knudsen and Peclet numbers increase, however, the effect of increasing Brinkman number and the group parameter is to increase entropy generation. Furthermore, it isrealized that the influences of rarefaction onentropy generation are slighter for low Peclet number flows
  6. Keywords:
  7. Brinkman number ; Closed-form expression ; Entropy generation ; Entropy generation rate ; Gas flows ; Geometrical aspects ; Group parameters ; Knudsen ; Microannulus ; Second Law of Thermodynamics ; Slip flow ; Slip velocity ; Temperature jump ; Thermo dynamic analysis ; Transverse distribution ; Velocity profiles ; Viscous heating ; Wall cooling ; Wall heat flux ; Aspect ratio ; Heating ; Peclet number ; Thermoanalysis ; Thermodynamics ; Entropy
  8. Source: Journal of Thermophysics and Heat Transfer ; Volume 24, Issue 4 , Oce-Dec , 2010 , Pages 785-795 ; 08878722 (ISSN)
  9. URL: http://arc.aiaa.org/doi/10.2514/1.48036