Unsteady forced convective heat transfer from a hot film in non-reversing and reversing shear flow
Abstract
The heat flux from a constant temperature hot film mounted flush with the surface of a plane insulating wall is examined numerically assuming that the thermal boundary layer theory is applicable everywhere and at all times. The flow field is described by (a) a pulsating or (b) a linearly decelerating two-dimensional shear flow. For high frequencies of the pulsation the calculated unsteady heat transfer departs strongly from the quasi-steady value. In reversing flow a considerable influence of the thermal wake can be seen. Computations of the time averaged heat flux show that an enhancement of heat transfer due to superimposed oscillations can only occur in reversing flow.
- Publication:
-
International Journal of Heat and Mass Transfer
- Pub Date:
- April 1983
- Bibcode:
- 1983IJHMT..26..545K
- Keywords:
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- Convective Heat Transfer;
- Forced Convection;
- Reversed Flow;
- Shear Flow;
- Thermal Boundary Layer;
- Unsteady Flow;
- Finite Difference Theory;
- Flow Theory;
- Heat Flux;
- Hot Surfaces;
- Fluid Mechanics and Heat Transfer