Air-Assisted Atomization of Beveled Needle Point Injector

Alex Valiaev,Khaled Sallam,Saqib Raza

doi:10.2218/iclass.2021.6115

Abstract

Air-Assisted Atomization of Beveled Needle Point Injector

Highlights

Air assisted atomizers has wide spread applications including atomization of biomedical suspensions
Ahmed et al, reported a new design of a hybrid air-blast and electrostatic atomizer that can be useful for the atomization of highly viscous fuels like biodiesel [5] and demonstrated that droplet and ligament size are reduced with increasing of spray charge, with the maximum effect of the charge being found for the lowest Weber number [5]
The geometry of the injector received considerable interest, e.g. Glathe et al, experimentally studied the effect of air-assisted atomization of liquid in the setup where liquid was delivered through a central tube, and the air was delivered through the annular orifice on the outer radius of the liquid tube

Summary

Introduction

Air assisted atomizers has wide spread applications including atomization of biomedical suspensions. The above two-stages process is referred to as primary atomization which, in cases where droplets exceed a critical size, is followed by secondary atomization to form smaller droplets According to this model of high-velocity air stream atomization developed by Yang et al, the liquid jet is first subjected to the Kelvin– Helmholtz instability which forms a liquid ligament followed by airflow assisted breakup of the filament into fine droplets through the effects of Rayleigh–Taylor instability [9]. Zhang et al has developed a model for air-assisted atomization of high-viscous glycerol/water jet injected into a coaxial airflow where the atomization occurs at elevated ambient pressures [11] Most of these studies were limited to relatively large injectors. The objective of this paper is to investigate the breakup outcomes of a beveled micro needle, used to inject test liquid into a coflowing airstream injected from a larger beveled needle motivated by the potential usage as disposable and inexpensive atomizers in variety of medical and industrial applications

Objectives

Methods

Results

Conclusion