Numerical Analysis For Flow And Heat Transfer Of Non-Newtonian Fluid In Annular Channels

Many laminar fully developed flows, that are processed in many heat exchange andflow devices with annular channels, exhibit a viscous, non-Newtonian behavior.This paper referred to the flows and the forced convection heat transfer of thepower-law fluids, and the different boundary conditions were considered. Numericalsolutions for the velocity and temperature distributions, Reynolds number, isothermalfrictions factors, and Nusselt numbers for different ducts were presented. And the instanceof inner core eccentricity was analyzed. The geometric asymmetry of the eccentric annularcross-section and the performance of the non-Newtonian were seen to have a stronginfluence on the velocity and temperature distributions. The annular ducts of varyingaspect ratios from 0.2 to 0.8, and inner core eccentricity from 0 to 0.6 were considered. Thecomplex ducts induced the non-uniformity in the velocity and the temperature field, whichproduced a significantly anomalous thermal-hydraulic performance. And the resultscomputed on unstructured grids and the solutions computed on structured grids werecontrasted, also compared with some results shown in the reference. All of these prove thatthe method and the program are correct and perfect. The methods and the conclusions ofthis paper can be helpful to the design in industry and the improved research.