Dual-mode nonlinear instability analysis of a confined planar liquid sheet sandwiched between two gas streams of unequal velocities and prediction of droplet size and velocity distribution using maximum entropy formulation

2018 ◽  
Vol 30 (4) ◽  
pp. 044104 ◽  
Author(s):  
Debayan Dasgupta ◽  
Sujit Nath ◽  
Dipankar Bhanja
Keyword(s):  
Velocity Distribution ◽  
Maximum Entropy ◽  
Droplet Size ◽  
Liquid Sheet ◽  
Nonlinear Instability ◽  
Dual Mode ◽  
Instability Analysis ◽  
Gas Streams ◽  
Entropy Formulation

Prediction of Droplet Size and Velocity Distribution in Spray Using Maximum Entropy Method

2009 ◽  
Author(s):  
Fathollah Ommi ◽  
Ehsan Movahednejad ◽  
S. Mostafa Hosseinalipour ◽  
Chien-Pin Chen
Keyword(s):  
Velocity Distribution ◽  
Maximum Entropy ◽  
Droplet Size ◽  
Early Stage ◽  
Maximum Entropy Principle ◽  
Droplet Formation ◽  
Entropy Method ◽  
Atomization Process ◽  
Gas Field ◽  
Liquid Bulk

The distribution of sizes and velocities of droplets initially formed in sprays is an important piece of information needed in the spray modeling, because it defines the initial condition of the spray droplets in the predictive calculations of the downstream flow fields. The early stage of the atomization process (Primary Breakup) is clearly deterministic, whereas the droplet formation stage is random and stochastic. The stochastic aspect deals with the stage of droplet formation after the liquid bulk breakup by statistical means through the maximum entropy principle (MEP) based. The MEP provided model predicts atomization process while satisfying constrain equations of mass, momentum and energy. This model is capable for considering drag force on droplets downstream through a gas field. The model prediction is compared favorably with the experimentally measured size and velocity distribution for droplets, near the liquid bulk breakup region, produced by an air-blast annular nozzle. Therefore, the present model can be used to predict the initial droplet size and velocity distribution in droplet formation region of sprays.

DUAL-MODE LINEAR ANALYSIS OF TEMPORAL INSTABILITY FOR POWER-LAW LIQUID SHEET

2016 ◽  
Vol 26 (4) ◽  
pp. 319-347 ◽  
Author(s):  
Han-Yu Deng ◽  
Feng Feng ◽  
Xiao-Song Wu
Keyword(s):  
Power Law ◽  
Linear Analysis ◽  
Liquid Sheet ◽  
Dual Mode ◽  
Temporal Instability

Linear Instability Analysis of an Annular Swirling Viscous Liquid Jet

2011 ◽  
Vol 66-68 ◽  
pp. 1556-1561 ◽  
Author(s):  
Kai Yan ◽  
Ming Lv ◽  
Zhi Ning ◽  
Yun Chao Song
Keyword(s):  
Viscous Liquid ◽  
Liquid Velocity ◽  
Aerodynamic Force ◽  
Numerical Procedure ◽  
Liquid Sheet ◽  
Linear Instability ◽  
Viscous Force ◽  
Liquid Jet ◽  
Instability Analysis ◽  
Linear Instability Analysis

A three-dimensional linear instability analysis was carried out for an annular swirling viscous liquid jet with solid vortex swirl velocity profile. An analytical form of dispersion relation was derived and then solved by a direct numerical procedure. A parametric study was performed to explore the instability mechanisms that affect the maximum spatial growth rate. It is observed that the liquid swirl enhances the breakup of liquid sheet. The surface tension stabilizes the jet in the low velocity regime. The aerodynamic force intensifies the developing of disturbance and makes the jet unstable. Liquid viscous force holds back the growing of disturbance and the makes the jet stable, especially in high liquid velocity regime.

Sign in / Sign up

Export Citation Format

Share Document