INJECTOR PRESSURE TRANSIENTS AND THEIR EFFECT ON DROPLET DYNAMICS. PART I. DROPLET SPIN AND EVAPORATION RATE. PART II. PRESSURE INDUCED SOLITARY WAVES ON A LIQUID JET.
Abstract
Pressure pulses at an orifice produce circular vortices in the emerging jet. The velocity and pressure profiles in the vicinity of the vortices have been derived analytically and resemble experimentally observed profiles. If strong enough these vortices produce solitary waves on the jet. By applying strong pressure pulses upstream of an orifice these waves have been observed in a laboratory experiment and their velocity and rate of growth have been measured. In the fully developed wave the vorticity has been expended. However, at high jet velocities, atomization of the wave occurs and it is claimed that the resulting droplets will be endowed with considerable initial angular velocity. Continued analytical work on the effect of such spin on the dynamics of droplets has been carried out. It now appears that the largest effect will be on the trajectory of the droplet which will tend to move in a direction normal to the jet direction. There is a small increase in evaporation rate due to the centrifugal potential of the droplet and this has been derived analytically. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1969
- Accession Number
- AD0695065
Entities
People
- P. D. Mccormack
Organizations
- Oakland University