Visualization studies of an acoustically excited liquid sheet.
The interaction between atomizing air and a liquid sheet initiates interfacial instabilities that develop into large amplitude waves, which ultimately promote liquid disintegration. However, to reduce atomizing airflow, the dynamic influence of the surrounding gas is not sufficient to affect the inner core of the liquid. In other words, the characteristic length scales of perturbation promoting break-up are small in comparison with the initial liquid momentum. Therefore, to enhance the disintegration process, the intact liquid-core near the nozzle outlet must be influenced by artificial or external excitations. To accomplish this, the present investigation employed a plane laminar liquid-sheet that was perturbed by acoustic excitations at an optimum frequency through the impinging air-streams.
Sivadas
Vayalakkara
V
Laboratory of Thermofluids, Combustion and Energy Systems, Center for Innovation, Technology and Policy Research, Instituto Superior Técnico, Technical University of Lisbon, Portugal. das@dem.ist.utl.pt
Heitor
Manuel V
MV