Comparison of Central Jet and Annular Sheet Atomizers at Identical Gas Momentum Flows

Abstract

This study compares three different nozzle flow configurationscentral liquid jet with surrounding gas phase, liquid sheet with central gas phase, and liquid sheet with inner and outer gas phases. To guarantee constant velocities, as well as momentum flows at the nozzle orifice, a nozzle with identical orifice areas (a central tube with inner and outer slits) was utilized in the experiments. The influence of gas velocity (GLR), dynamic viscosity of the liquid, and nozzle configuration on the resulting droplet sizes (D 32, ID 32,m) and primary breakup was investigated at constant liquid mass flow. A high-speed camera (HSC) was used for the detection of primary breakup, whereas droplet size measurements were performed with a phase Doppler anemometer. The variation of nozzle configuration exhibited distinct influence on the resulting breakup morphology and droplet size. Especially, for atomizing high-viscosity liquids, application of sheet configurations led to smaller droplet sizes compared to liquid jet configuration.

Efficiency Optimization of an Annular-Nozzle Air Ejector under the Influence of Structural and Operating Parameters

“…To date, there is no unified theory of gas atomization of liquids, especially in the case of rheologically complex systems. Therefore, the study of the atomization processes of such liquids containing gases is one of the key factors in developing the annular nozzle-ejector intended for various purposes [41][42][43][44]. One of the research fields is the optimization of the ANAE efficiency under the influence of structural and operational parameters.…”

Mass Flow Scaling of Gas-Assisted Coaxial Atomizers

“…As the experiments were carried out over a wide range of liquid mass flows ( Ṁliq = 20-500 kg•h −1 ), two different spray test rigs were employed. The ATMOspheric spray test rig (ATMO), which is described in detail in Wachter et al [38], was utilized for liquid mass flows at the lab-scale between Ṁliq = 20-100 kg•h −1 .…”

Atomization characteristics of a bluff body-assisted sonic twin-fluid atomizer

“…The above studies deal with the liquid jet interaction with the high-speed air stream. However, it was shown that sheet atomization is more effective than a liquid jet in obtaining finer atomization (Wachter et al 9 ). Lately, shock wave-liquid sheet interaction studies (Jeon et al 10 ) revealed that the thicker viscous sheet attenuates the shock strength due to the energy absorption.…”