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Showing 1 to 12 of 12 for “"Refractive index matching"”.
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Turbulent interactions between stream flow and near-subsurface flow: a laboratory approach using particle image velocimetry and refractive index matching
… using particle image velocimetry (PIV) and refractive index matching (RIM). This combination allows for detailed examination of flow fields both in the near-bed region and within the pore spaces at two flow Reynolds numbers. In additional experiments, a channel-spanning cylinder and a single …
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Left Ventricle Assist Device
… The report further emphasized the importance of refractive index matching to perform particle image velocity. Matching the refractive index of the phantom with the medium is critical to avoid distortion and refraction of the light. Glycerol water was found to be an effective medium for refractive …
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Internal Fluid Dynamics and Frequency Characteristics of Feedback-Free Fluidic Oscillators
… various scale oscillators was extracted using a refractive index-matched Particle Image Velocimetry (PIV) technique with the help of a PIV phase averaging method and a new sensor setup for simultaneous frequency measurements in refractive index matching fluid. Three different operating regimes …
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On the modulation of low-order roughnesses on the flow over low-order topographies
… high-resolution particle image velocimetry in a refractive-index-matching channel at Reynolds numbers Re = 40,000, based on the channel half height and the bulk velocity. The topographies consisted on 2D and 3D sinusoidal waves, which spanned most of the test section. The roughnesses also …
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On the hydrodynamics of flexible vegetation canopies
… of novel methodological approaches, including refractive-index-matching techniques allowing non-intrusive laser-based techniques to obtain detailed measurements within canopy for the first time. Coupled with the bespoke design of geometrically and dynamically scaled flexible surrogate seagrass …
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Simulations And Experiments Of Fuel Injection, Mixing And Combustion In Di Gasoline Engines
… deposit characteristics were derived using the Refractive Index Matching (RIM) technique. Finally, the interactions of sprays with the charge motion are investigated in an optical accessible engine using CFD simulation and high-speed imaging of sprays inside engines. </p> <p> The numerical …
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Experimental investigation of cavitation in a cylindrical orifice
… in large-scale plain orifice nozzles. Refractive index matching with an 8.25mm diameter acrylic nozzle using aqueous sodium iodide as the test fluid allowed clear optical access of the flow structures near the orifice wall. High resolution images of the flow structures recorded using …
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Transition to turbulence and relaminarization of pulsatile pipe flows
… image velocimetry data were acquired in a refractive index matching setup by using a continuous wave laser and a high-frame-rate digital camera. The position of the piston was continuously recorded by a laser proximity sensor. Different experiments were carried out with Reynolds numbers in …
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Experimental investigation on turbulent flow overlying permeable walls
… velocimetry technique coupled with a unique refractive-index matching flow environment, whereby the latter provided full optical access to the flow in the vicinity of and within the permeable interface and the former allowed the acquisition of instantaneous velocity fields in this region with …
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Flow over large-scale low-order topographies: impact of heterogeneities
… Particle image velocimetry (PIV) was used in a refractive-index-matching (RIM) channel to study the dynamics of the flow over a series of topographies consisting of (i) 2D and 3D wavy walls and (ii) homogeneous and heterogeneous canopies. The focus of these experiments is to characterize and …
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Physico-chemical hydrodynamics of droplets on textured surfaces with engineered micro/nanostructures
… that combines wetting phenomena and adiabatic refractive index-matching together with a novel nanofabrication method is introduced to select slender tapered nanostructures that fulfill the multiple functionalities. The resulting nanoconetextured glass substrate exhibits highly robust …
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Inner-outer interactions in a rough-wall turbulent boundary layer
… (PIV). The experiments, performed in a refractive-index-matched flow facility, enabled the measurements very close to the surface without being impeded by the near-wall reflections that are common in smooth- and rough-wall PIV experiments. Following a preliminary demonstration of the …