Affiliations: Department of Mechanical & Nuclear Engineering,
Kansas State University, Manhattan, KS 66506-5106, U.S.A. | Innovative Scientific Solutions, Inc., 2786 Indian
Ripple, Dayton, Ohio 45440-3638, U.S.A. | Air Force Research Laboratory, Wright-Patterson AFB,
Ohio 45433-7103, U.S.A.
Abstract: Holography is capable of three-dimensional (3D) representation of
spatial objects such as fluid interfaces and particle ensembles. Based on this,
we adapt it into a 3D flow visualization tool called Holographic Flow
Visualization (HFV). This technique provides a novel means of studying
spatially and temporally evolving complex fluid flow structures marked by a
disperse phase or interfaces of different fluids. This paper demonstrates that
HFV is a straightforward technique, especially when the In-line Recording
Off-axis Viewing (IROV) configuration is used. The technique can be applied
either as a stand-alone experimental tool for studying scalar-based coherent
structures, flow instabilities, interactions of different fluids driven by
fluid dynamics, interfacial phenomena, or as a precursor to volumetric 3D
velocity vector field measurement of complex transient flow dynamics.
Experimental results in several complex fluid flows and flames demonstrate the
effectiveness of HFV. Different methods are used to mark flow structures
undergoing different instabilities: 1) a vortex ring grown out of a drop of
polymer suspension falling in water, 2) cascade of a bag-shaped drop of milk in
water, and 3) internal flow structures of a jet diffusion flame.
Keywords: holographic flow visualization, holographic PIV, particle-laden flows, jet diffusion flame, flame-vortex interaction, vortex cascade, vortex ring instability, drop instability
