Demonstration of High Speed (20 kHz) Digital Inline Holographic (DIH) Imaging of a Multiphase Event: Drop Impact on a Thin Liquid Film
Abstract not provided.
Publications
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Jump to search filtersCharacterization of drop aerodynamic fragmentation in the bag and shear thinning regimes by crossed-beam two-view digital in-line holography
Abstract not provided.
Viscous drops impacting thin liquid surfaces: experimental quantification of secondary fragment size and velocities
Abstract not provided.
One-dimensional turbulence simulation of soot and enthalpy evolution in ethylene jet diffusion flames
Abstract not provided.
Pulse-burst PIV in a high-speed wind tunnel
53rd AIAA Aerospace Sciences Meeting
Time-resolved particle image velocimetry (TR-PIV) has been achieved in a high-speed wind tunnel, providing velocity field movies of compressible turbulence events. The requirements of high-speed flows demand greater energy at faster pulse rates than possible with the TR-PIV systems developed for low-speed flows. This has been realized using a pulse-burst laser to obtain movies at up to 50 kHz with higher speeds possible at the cost of spatial resolution. The constraints imposed by use of a pulse-burst laser are a limited burst duration of 10.2 ms and a low duty cycle for data acquisition. Pulse-burst PIV has been demonstrated in a supersonic jet exhausting into a transonic crossflow and in transonic flow over a rectangular cavity. The velocity field sequences reveal the passage of turbulent structures and can be used to find velocity power spectra at every point in the field, providing spatial distributions of acoustic modes. The present work represents the first use of TR-PIV in a high-speed ground test facility.
Pulse-Burst PIV in a High-Speed Wind Tunnel
Abstract not provided.
Soot and temperature measurements and predictions in highly sooting turbulent flames
Abstract not provided.
Quantitative three-dimensional imaging of aluminum drop combustion in solid propellant plumes via digital in-line holography
Optics Letters
Abstract not provided.
Refinement of particle detection by the hybrid method in digital in-line holography
Applied Optics
Abstract not provided.
Characterization of Aerodynamic Fragmentation of a Drop by Cross-beam Two-view Digital In-line Holography
Abstract not provided.
Digital In-Line Holography (DIH) for 3D Imaging of Aluminum Drop Combustion in Propellant Plumes
Abstract not provided.
Digital In-Line Holography (DIH) for 3D Measurement of Aluminum Drop Combustion in Propellant Fires
Abstract not provided.
3D-3C particle field measurements using single-view digital in-line holography
Abstract not provided.
Digital in-line holography (DIH) for 3D measurement of aluminum drop combustion in propellant fires
Abstract not provided.
Characterization of aerodynamic fragmentation of a drop by cross-beam two-view digital in-line holography
Abstract not provided.
Digital in-line holography for 3D quantification of complex multiphase flows
Abstract not provided.
Digital in-line holography to quantify secondary droplets from the impact of a single drop on a thin film
Experiments in Fluids
Digital in-line holography (DIH) is an optical technique which measures particle sizes and their three-dimensional (3D) positions and velocities. Here DIH and a recently proposed hybrid method of particle detection are applied to quantify the secondary droplets generated by the impact of a single drop on a thin film. By leveraging the expected symmetry between in-plane and out-of-plane velocities, experimental depth uncertainty is measured to be approximately 0.7 of the mean droplet diameter. Furthermore, comparison with previous measurements using alternative techniques shows good agreement with the measured temporal evolution of drop number, size, and velocity components. Finally, the power of DIH to extract the complex 3D morphology of the protruding jets is demonstrated. © 2014 Springer-Verlag Berlin Heidelberg.
Digital in-line holography (DIH) for 3D imaging of aluminum drop combustion in propellant plumes
Optics InfoBase Conference Papers
Digital in-line holography (DIH) is an optical technique which allows for numerical refocusing after an experiment. Here we discuss application of DIH for high-fidelity visualization and quantification of aluminum drop combustion in propellant plumes. © 2014 OSA.
Developments in digital holography enable the measurment of three-dimensional particle fields with improved accuracy
Abstract not provided.
Experimental methods to quantify particle positional and displacement uncertainty along the depth direction in digital in-line holography
Abstract not provided.
Developments in digital in-line holography enable validated measurement of 3D particle field dynamics
Digital in-line holography is an optical technique which can be applied to measure the size, three-dimensional position, and three-component velocity of disperse particle fields. This work summarizes recent developments at Sandia National Laboratories focused on improvement in measurement accuracy, experimental validation, and applications to multiphase flows. New routines are presented which reduce the uncertainty in measured position along the optical axis to a fraction of the particle diameter. Furthermore, application to liquid atomization highlights the ability to measure complex, three-dimensional structures. Finally, investigation of particles traveling at near sonic conditions prove accuracy despite significant experimental noise due to shock-waves.
Experimental methods to quantify particle positional and displacement uncertainty along the depth direction in digital in-line holography
Abstract not provided.
Accurate measurement of out-of-plane particle displacement from the crosscorrelation of sequential digital in-line holograms
Optics Letters
Abstract not provided.
Uncertainty characterization of particle depth measurement using digital in-line holography and the hybrid method
Optics Express
Abstract not provided.
Characterization of Secondary Drops Using Digital In-line Holography
Abstract not provided.
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