Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Mechanical Engineering


Mechanical Engineering

First Advisor

Terrence R. Meyer

Second Advisor

Travis R. Sippel


The mixing of gas and liquid fluids in atomizing flows is a physical phenomena of fundamental and practical importance. The individual fluid streams, each with their own momentum, viscosity, surface tension and thermodynamic states, mix to create a turbulent and chaotic flow. The complexity of the mixing process is often too great to accurately predict, even using modern computational models, and the resulting flow is often too optically dense to probe experimentally using current methods. In the current thesis, a study into the use of x-ray based diagnostics was performed on an optically dense, multiphase co-axial rocket flow using a variety of new and established diagnostic techniques. The injector studied was a NASA designed 110 N swirl-coaxial rocket injector designed to operate on gaseous methane and liquid oxygen. During the investigation, a range of fluids combinations were studied including water, liquid nitrogen and liquid argon as simulants for liquid oxygen, as well as air, gaseous nitrogen, argon, and krypton as simulants for gaseous methane. A range of diagnostics were performed in the study, with all experiments performed at the 7-BM beamline at the Advanced Photon Source (APS) at Argonne National Laboratory. The x-ray source at the APS provided both a narrowband monochromatic x-ray beam for line of sight investigations of radiography and fluorescence and a polychromatic 'white beam' for two dimensional, time-sequential radiography. The advantages, limitations and accuracy of the techniques are discussed, and the results of investigations into fluid mixing are given.


Copyright Owner

Christopher Daniel Radke



File Format


File Size

179 pages