Session: 06-01: Spray Modeling

Paper Number: 140123

140123 - Predicting Impact Regime and Droplet Size Distribution of Drop-Wall Interactions at Engine Conditions 

Abstract: 

Droplet interactions with heated wall have been studied in many engineering applications for characterizing the post-impact properties of secondary droplets. The physical size, temperature and vapor-mass generation of secondary droplets are influenced by wall temperature, ambient pressure, impact momentum and angle of impact. The post-impact behavior of the secondary droplets depends on the combination of these factors. Different regimes (deposition, rebound, contact-splash and film-splash) can be predicted based on the post-outcome behavior. In this paper, a drop-wall interaction model using smoothed particle hydrodynamics (SPH) is used for F-24 (a military-grade jet fuel) to obtain the different impact outcome regimes explaining the effect of ambient pressure on the Leidenfrost behavior. The impact parameter and Leidenfrost point are expressed in empirical relations for the fuel at elevated pressures. The film-boiling regime for F-24 is identified and the effect of successive impacts on the secondary droplet size in that regime is studied. The results are compared for different frequencies of impingement. Single droplet impact cases are also compared with successive impacts for the secondary droplet size for different fuels at different impact Weber numbers. The size of secondary droplets for successive impacts is observed to be nearly indistinguishable from that of single-drop impact.

Presenting Author: Song-Charng Kong Texas Tech University

Presenting Author Biography: Chair
Department of Mechanical Engineering
Texas Tech University

Authors:

Mohammad Fahim Faisal Patwary Texas Tech University
Doruk Isik Texas Tech University
Song-Charng Kong Texas Tech University
Eric Mayhew DEVCOM, Army Research Laboratory
Kenneth S. Kim DEVCOM, Army Research Laboratory
Chol-Bum M. Kweon DEVCOM, Army Research Laboratory