ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
ANALYSIS OF HEAT TRANSFER IN TRANSITIONAL AND FULLY TURBULENT PLANE COUETTE FLOW
Resumo
Transitional Turbulent plane Couette flow is quite important in the field of lubrication. To date, classical eddy diffusivity approaches to analyzing transitional turbulent boundary layer flows have been rather ineffective. The main difficulty in analyzing these
flows is the lack of information pertaining to
the eddy momentum diffusivity Cm and the turbulent
Prandtl number Prt within the wall region. This region extends across much of the flow field for low Reynolds number transitional turbulent conditions.
An alternative approach to the analysis of wall turbulence has recently been developed which does not involve the use of inputs for Cm or Prt within the wall region. In this surface renewal approach the fluid flow and energy transfer associated with the turbulent burst phenomenon are modeled. In the present paper, this surface renewal approach to modeling wall turbulence is coupled with a classical eddy diffusivity representation of the turbulent core to develop a unified analysis 'for heat transfer in plane Couette flow which is applicable over the entire Reynolds number range. The analysis provides predictions for the Nusselt number and the mean velocity and temperature profiles. In addition, predictions are developed for the turbulent Prandtl number in the wall region.
An alternative approach to the analysis of wall turbulence has recently been developed which does not involve the use of inputs for Cm or Prt within the wall region. In this surface renewal approach the fluid flow and energy transfer associated with the turbulent burst phenomenon are modeled. In the present paper, this surface renewal approach to modeling wall turbulence is coupled with a classical eddy diffusivity representation of the turbulent core to develop a unified analysis 'for heat transfer in plane Couette flow which is applicable over the entire Reynolds number range. The analysis provides predictions for the Nusselt number and the mean velocity and temperature profiles. In addition, predictions are developed for the turbulent Prandtl number in the wall region.