PIV investigations on optical magnification and small scales in the near-field of an orifice jet

Lacagnina, Giovanni; Romano, G. P.

doi:10.1007/s00348-014-1872-8

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…However such a hypothesis is hardly verified in most of interesting flows and particularly in the near field of a turbulent jet [6], thus it would be highly desirable to determine specific values for such ratios to be used as references and how they are dependent on specific conditions, as inlet and boundary conditions and Reynolds number.…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

Large and small scales in a turbulent orifice round jet: Reynolds number effects and departures from isotropy

Romano

2020

International Journal of Heat and Fluid Flow

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Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

Large and small scales in a turbulent orifice round jet: Reynolds number effects and departures from isotropy

Romano

2020

International Journal of Heat and Fluid Flow

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“…Kwon and Seo (2005) were focusing on the averaged flow profiles of jets at different Reynolds numbers. Lacagnina and Romano (2015) investigated the influence of the optical magnification on the flow statistics of a submerged jet. Ganapathisubramani et al (2007Ganapathisubramani et al ( , 2008 used stereo PIV to measure the flow characteristics of submerged jet.…”

Section: Previous Experimental Workmentioning

confidence: 99%

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Puttinger

Saeedipour

2021

Exp. Comput. Multiph. Flow

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This paper presents an experimental investigation on the interactions of a deflected submerged jet into a liquid pool with its above interface in the absence and presence of an additional lighter liquid. Whereas the former is a free surface flow, the latter mimics a situation of two stratified liquids where the liquid-liquid interface is disturbed by large-scale motions in the liquid pool. Such configurations are encountered in various industrial applications and, in most cases, it is of major interest to avoid the entrainment of droplets from the lighter liquid into the main flow. Therefore, it is important to understand the fluid dynamics in such configurations and to analyze the differences between the cases with and without the additional liquid layer. To study this problem, we applied time-resolved particle image velocimetry experiments with high spatial resolution. A detailed data analysis of a small layer beneath the interface shows that although the presence of an additional liquid layer stabilizes the oscillations of the submerged jet significantly, the amount of kinetic energy, enstrophy, and velocity fluctuations concentrated in the proximity of the interface is higher when the oil layer is present. In addition, we analyze the energy distribution across the eigenmodes of a proper orthogonal distribution and the distribution of strain and vortex dominated regions. As the main objective of this study, these high-resolution time-resolved experimental data provide a validation platform for the development of new models in the context of the volume of fluid-based large eddy simulation of turbulent two-phase flows.

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“…column for all the rows corresponds to the mean of the corresponding column from the X matrix, see equations (3) and (4). The P À1 is the inverse covariance matrix of the whole database X of 25 rows by 400 columns, see matrix in equation 5, where each row is an observation, and each column a variable.…”

Section: Technique For 2-d Velocity Profile Enhancementmentioning

confidence: 99%

“…Examples of systems that use the PIV techniques to characterize its performance are the turbulent jets used in a wide variety of applications, as in marine propulsion, pollutant discharge, or studies on the cardiocirculatory system. 4 The turbines are used for hydropower purposes to analyze from complex turbulent to two-phase flows. 5 Centrifugal pumps are used to measure the complex flow structures around the volute tongue region, where intense rotor–stator interaction appears.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic velocity profile measurement for microelectromechanical systems micro-robot design

Flores-Fuentes

Valenzuela-Delgado

Caceres-Hernandez

et al. 2019

International Journal of Advanced Robotic Systems

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The development of microelectromechanical systems based on magnetohydrodynamic for micro-robot applications requires precise control of the micro-flow behavior. The micro-flow channel design and its performance under the influence of the Lorentz force is a critical challenge, the mathematical model of each magnetohydrodynamic device design must be experimentally validated before to be employed in the fabrication of microelectromechanical systems. For this purpose, the present article proposes the enhancement of a particle image velocimetry measurement process in a customized machine vision system. The particle image velocimetry measurements are performed for the micro-flow velocity profile mathematical model validation of a magnetohydrodynamic stirrer prototype. Data mining and filtering have been applied to a raw measurement database from the customized machine vision system designed to evaluate the magnetohydrodynamic stirrer prototype. Outlier’s elimination and smoothing have been applied to raw data to approximate the particle image velocimetry measurements output to the velocity profile mathematical model to increase the accuracy of a customized machine vision system for two-dimensional velocity profile measurements. The accurate measurement of the two-dimensional velocity profile is fundamental owing to the requirement of future enhancement of the customized machine vision system to construct the three-dimensional velocity profile of the magnetohydrodynamic stirrer prototype. The presented methodology can be used for measurement and validation in the design of microelectromechanical systems micro-robot design and any other devices that require micro-flow manipulation for tasks such as stirring, pumping, mixing, networking, propelling, and even cooling.

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PIV investigations on optical magnification and small scales in the near-field of an orifice jet

Cited by 11 publications

References 31 publications

Large and small scales in a turbulent orifice round jet: Reynolds number effects and departures from isotropy

Large and small scales in a turbulent orifice round jet: Reynolds number effects and departures from isotropy

Time-resolved PIV measurements of a deflected submerged jet interacting with liquid-gas and liquid-liquid interfaces

Magnetohydrodynamic velocity profile measurement for microelectromechanical systems micro-robot design

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