A comparison of measured velocity structure functions and energy dissipation theories in turbulent flows
Abstract
Parallel hot-wire sensors have been used to determine the structure functions of turbulence velocity fluctuations of up to 18th order, on the axis of a modified air jet, at Reynolds numbers of 72 and 102. Measured values of the exponent due to intermittency were compared with those predicted by the log-normal beta-model as well as a novel theory based on gamma statistics for the local average dissipation rate. The intermittency parameter, which appears as an exponent in the sixth-order structure function, is found to equal 0.2, in keeping with recently reported measurements.
- Publication:
-
Forum on Turbulent Flows - 1989
- Pub Date:
- 1989
- Bibcode:
- 1989ftf..proc...29J
- Keywords:
-
- Energy Dissipation;
- Flow Characteristics;
- Flow Velocity;
- Turbulent Flow;
- Velocity Distribution;
- Air Jets;
- Energy Distribution;
- Flow Distribution;
- Hot-Wire Flowmeters;
- Turbulence Models;
- Fluid Mechanics and Heat Transfer