Acoustic pulsations and vibratory stresses in heat exchangers
Abstract
The flow of a heat-bearing fluid in a heat exchanger causes the loosening of nonstreamlined obstacles which it encounters. The effect is simultaneous production of a mechanical excitation of these obstacles and generation of fluctuations of pressure downstream from them. Pressure pulsations generated by obstacles are not greatly influenced by mechanical vibrations of the obstacles so long as the amplitude of such vibrations remains low. On the other hand, the proximity of partitions and coincidences with acoustic resonances sometimes impose a synchronization of pulsations and consequently an increase in amplitude. These acoustic pulsations are propagated in the flow and create mechanical vibrations on the sides of the exchanger. These vibrations may in some cases reach substantial magnitude at points far removed from the obstacles constituting the source of excitation.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1978
- Bibcode:
- 1978STIN...7929455J
- Keywords:
-
- Acoustic Propagation;
- Heat Exchangers;
- Pressure Pulses;
- Vibrational Stress;
- Acoustics;
- Analysis (Mathematics);
- Excitation;
- Fluid Flow;
- Sound Waves;
- Fluid Mechanics and Heat Transfer