Instrumentation, Measurements, and Experiments in Fluids | Taylor & Francis GroupExperiments in Fluids. December , Cite as. Optical laser-based techniques and an extensive data analysis methodology have been developed to acquire flow and separation characteristics of concentrated liquid—liquid dispersions. Measurements were conducted at 15 and equivalent pipe diameters downstream the inlet. Planar laser induced fluorescence PLIF measurements illustrated the flow structures and provided the local in-situ holdup profiles. It was found that along the pipe the drops segregate and in some cases coalesce either with other drops or with the corresponding continuous phase.
Instrumentation, Measurements, and Experiments in Fluids, Second Edition
PIV software is used to post-process the optical images. The profile had a plug-like shape in the fully dispersed flow cases, close to the inlet. Molecular Gas Dynamics 3? The experimnts is also conducted to prepare the images for analysis with the PIV, PTV and drop size routines.By comparing the initial to the last axial locations, Sheng et al. As a final example, it is clear that both drop-drop and drop-interface coalescence inetrumentation taken place! This is converted to a velocity using the time between laser shots and the physical size of each pixel on the camera. Syed Ashfaq, S.
Surendra Verma. Rathakrishnan, E. While the method of adding particles or objects to a fluid in order to observe its flow is likely to have been used from time to time through the ages no sustained application of the method is known.
Wind Tunnels 3. Hot-Wire Anemometry 5.
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First Published Rathakrishnan, E? The four cameras are paired into groups of two. Applied Insturmentation Dynamics. The velocity of the aqueous continuous phase is also plotted.
Particle image velocimetry PIV is an optical method of flow visualization used in education  and research. The fluid is seeded with tracer particles which, for sufficiently small particles, are assumed to faithfully follow the flow dynamics the degree to which the particles faithfully follow the flow is represented by the Stokes number. The fluid with entrained particles is illuminated so that particles are visible. The motion of the seeding particles is used to calculate speed and direction the velocity field of the flow being studied. Other techniques used to measure flows are laser Doppler velocimetry and hot-wire anemometry. The main difference between PIV and those techniques is that PIV produces two-dimensional or even three-dimensional vector fields , while the other techniques measure the velocity at a point.
An example of PIV analysis without installation . Skip to main content Skip to sections. With up to eight channels of synchronized timing, they offer the means to control several flash lamps and Q-switches as well as provide for multiple camera exposures. Pressure Transducers 7.
It is possible that the flow is not yet fully developed at this axial location. Barral AH, Angeli P Interfacial characteristics of stratified liquid-liquid flows using a conductance probe. Journal of Fluid Mechanics. The high speed PLIF technique enables measurements of flow distribution exeriments two axial locations and helps to illustrate the transitions in flow patterns along the pipe.The trends are illustrated by lines calculated by fitting low order polynomials to successive ;df data points using a moving average filtering approach Guest Schematic representation of the experimental setup for the optical measurements. Advertisement Hide! MicroPIV makes use of fluorescing particles that excite at a specific wavelength and emit at another wavelength.
For this flow condition, and thus the velocity of the dispersed phase is measured. It also provides insight into the vital topics nistrumentation issues associated with the devices and instruments used for fluid mechanics and gas dynamics experiments. Several open source implementations are available! Abida Begum.