Abstract
Atomization performance of effervescent atomizers with gas-liquid internal mixing The paper contains the results of experimental studies on water atomization process in effervescent nozzle in one-phase and two-phase systems. The gas phase flow rate causes the changes in characteristic parameters of atomization. The gas flow rate has certain effect on the Sauter Mean Diameter SMD values. SMD for airliquid systems investigated is decreasing with increase of gas volume rate. It is observed that SMD values are increasing with increase of liquid volume rate. The larger SMD values for one-phase flow in comparison with two-phase flow have also been observed. The increase of SMD value has been observed with a decrease of an outlet diameter of an effervescent nozzle.
Highlights
Effervescent atomization is a method of twin-fluid atomization that involves bubbling a small amount of gas into the liquid before it is ejected from the atomizer
Sauter mean diameter (SMD) values are increasing with increase of liquid volume rate
Our studies have shown that at low gas-to-liquid ratio by mass (GLR) (
Summary
Effervescent atomization is a method of twin-fluid atomization that involves bubbling a small amount of gas into the liquid before it is ejected from the atomizer. Atomizing gas is injected into the liquid at very low velocity to form a bubbly two-phase mixture upstream of the discharge orifice This method of atomization is not restricted to volatile liquids or liquids that can hold a substantial amount of dissolved gas. The bubble formation process does not involve mass diffusion of dissolved gas to the nucleation sites, as in dissolved gas atomization, or energy diffusion necessary for evaporation, as in flash atomization. These inherently slow processes necessitate the use of expansion chambers in flashing and dissolved gas systems, limitations not found in effervescent atomizers. The paper contains the results of experimental investigation of atomization process in effervescent nozzles with internal mixing obtained by the use of the digital microphotography method
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