Thermodynamic aspects of adiabatic and diabatic tube flow regime transitions - Single-phase fluids
Abstract
The transition between stable steady-state laminar and turbulent flow regimes in long channels of constant cross section is analyzed under adiabatic and non-adiabatic conditions, first according to conventional methods then in the light of second law thermodynamic considerations. It is shown that the ultimate choice of stable steady-state flow regime is always associated with either a minimum or a maximum irreversible entropy production per unit time, depending on external constraints. Thus the choice of flow regime is most generally associated with an extremum of entropy production per unit time rather than a minimum entropy production according to a most fundamental theorem of the 'linear branch' of irreversible thermodynamics.
- Publication:
-
4th Joint Thermophysics and Heat Transfer Conference
- Pub Date:
- June 1986
- Bibcode:
- 1986jtht.confU....S
- Keywords:
-
- Adiabatic Conditions;
- Channel Flow;
- Laminar Flow;
- Thermodynamic Properties;
- Turbulent Flow;
- Blasius Equation;
- Entropy;
- Navier-Stokes Equation;
- Reynolds Number;
- Single-Phase Flow;
- Steady State;
- Fluid Mechanics and Heat Transfer