An Experimental Study of a Yield Pseudo-plastic Jet Using Particle Image Velocimetry PDF Download
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Author: Thomas D. Weir
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 110
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Book Description
Author: Thomas D. Weir
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 110
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Book Description
Author:
Publisher:
ISBN:
Category : Fluid dynamic measurements
Languages : en
Pages : 248
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Book Description
Author: Sreechakradhar Masabattula
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
Author:
Publisher:
ISBN:
Category : Electrorheological fluids
Languages : en
Pages : 280
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Book Description
Papers presented at the ASME International Mechanical Engineering Congress and Exposition.
Author: David Joseph Danitz
Publisher:
ISBN:
Category :
Languages : en
Pages : 251
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Book Description
Author: Martin Agelin-Chaab
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Book Description
Turbulence kinetic energy -- particle image velocimetry -- proper orthogonal decomposition -- two-point velocity correlations -- triple velocity products -- harpin vortex -- turbulenc production.
Author: Ronald J. Adrian
Publisher: Cambridge University Press
ISBN: 0521440084
Category : Science
Languages : en
Pages : 585
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Book Description
Particle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.
Author: Supun Pieris
Publisher:
ISBN:
Category : Air jets
Languages : en
Pages : 100
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Book Description
Impinging jets are commonly employed in engineering applications, such as cooling and drying processes, requiring relatively high local transport properties. Flow development of a planar impinging jet and the effect of varying jet parameters are investigated experimentally in a jet facility that is specifically designed, fabricated, and characterized as part of the current study. The velocity field is measured using time-resolved, planar, two-component Particle Image Velocimetry. The investigation focuses on two jet parameters: Reynolds number and nozzle-to-plate spacing. Four test cases are investigated, including two Reynolds numbers 3000 and 6000, and two nozzle-to-plate spacings, 2B and 4B, where B is the jet width. Primary vortices form in the shear layer just downstream of the nozzle exit due to amplification of disturbances through the Kelvin-Helmholtz instability. Vortex shedding exhibits higher periodicity with increasing Reynolds number but is not significantly affected by changes to the nozzle-to-plate spacing. Further, vortex shedding location shifts upstream with increasing Reynolds number. The Strouhal number based on vortex shedding frequency varies between 0.4-0.5 and the vortices are convected downstream at an average convective velocity of 57% of the jet centerline velocity for all cases examined. For Reynolds number of 6000, the characteristic wavelength of the primary vortices is 1.1B for both nozzle-to-plate spacings. At the lower Reynolds number, the wavelengths increase to approximately 1.3B and 1.5B, for nozzle-to-plate spacings of 2B and 4B, respectively. Local deceleration of primary vortices, due to the impinging surface, causes consecutively shed vortices to merge, with vortex merging observed in all cases investigated. As the primary vortices pass in the outer shear layer of the wall jet region, secondary vortices of opposingly signed vorticity form due to roll-up of the wall bound vorticity in the inner shear layer. The secondary vortex shedding is marked by amplification of the surface normal velocity fluctuations in the inner shear layer when x/B > 3. The secondary vortex shedding shows a lower periodicity compared to the primary vortices but in general have convective velocities that are larger than that of the primary vortices. As the Reynolds number is increased, the secondary vortex formation is suppressed, and, as a result, the wall jet develops more parallel to the impinging surface. With increasing Reynolds number, the convective velocities of the secondary vortices also decrease. In all cases, pairing between a primary and secondary vortex is observed and the paired vortices are convected in the streamwise direction away from the surface. At the higher Reynolds number, the pairing is immediately followed by vortex breakdown.
Author: Periasamy Chinnapalaniandi
Publisher:
ISBN:
Category :
Languages : en
Pages : 286
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Book Description
Author: Jenna Marie McKown
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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Book Description
The impacts of solid spheres with the free surface have been studied for over one hundred years. In this thesis, the Worthington jets resulting from the impacts of hydrophobic and hydrophilic spheres with the free surface are studied experimentally. Several impact velocities and three materials of differing mass ratios are used. The resulting jets are characterized in terms of common non-dimensional physical parameters. A single camera is used to image activity both above and below the free surface simultaneously. The resulting images provide measurements of the height and velocity of the Worthington jets, as well as information about the breakup of the columns of fluid into droplets. In the hydrophilic cases, two separate regimes of jet formation are observed. The heights of both the first and second jet are recorded with time, and the maximum heights of each jet are compared to the Froude number at impact. The maximum height of the second jet is found to scale linearly with We, which is calculated using the velocity of the jet tip rather than impact velocity. Viscosity is shown to be negligible while a dependence on gravity is indicated. The time at which the first jet breaks up is proportional to Froude number, while the time of breakup for the second jet is nearly constant. Comparisons to energy transfer are presented. In the hydrophobic cases, the Worthington jet results from the collapse of the cavity formed below the free surface. Heights of the continuous Worthington jet are recorded for each time step, and average maximum heights obtained are again compared to Froude and Weber numbers. The increased variability in these data hinder clear scaling, and experimental error is calculated from repeated trials of two representative cases. Unaffected by experimental variation, however, the lifespan of the Worthington jets is shown to depend linearly on Froude number. Energy comparisons are explored.
