2020 journal article

Explosive boiling-up in a swirl jet of superheated ethanol

International Journal of Heat and Mass Transfer, 149.

By: A. Reshetnikov, K. Busov*, O. Kapitunov* & V. Skokov*

co-author countries: Russian Federation 🇷🇺

Contributors: A. Reshetnikov, K. Busov*, O. Kapitunov* & V. Skokov*

author keywords: Short nozzle; Swirl jet; Metastable liquid; Superheats; Vaporization mechanism; Explosive boiling-up; Coanda effect; 1/f fluctuations
Source: ORCID
Added: March 21, 2020

Based on the knowledge of the kinetics of liquid vaporization under conditions of high and attainable superheats, experimental data on the atomization of a jet of boiling ethanol at various speeds of a flow swirl are discussed. It has been stated that under conditions of low superheats and boiling-up on solitary non-interacting heterogeneous sites, the rotation of the flow is considered to be the decisive factor in the atomization process. At high superheats and the realization of the mechanism of intense heterogeneous vaporization, the effect of boiling-up on the jet disintegration becomes dominant. When establishing conditions for explosive boiling-up (homogeneous nucleation) under attainable superheats, a complete jet breakup was observed both without a swirl and at low swirl speeds. With an increase in the swirl speed, the temperature range of the breakup narrowed. With a strong swirl the breakup disappeared completely. In the initial states of ethanol close to the thermodynamic critical point, the jet shape was similar to a gas one with or without a swirl. The 1/f fluctuations revealed were caused by oscillations (nutation) of the precessional motion of the jet. They indicate a possibility of large-scale outbursts in the jet.