Measurement and analysis of flow behaviour in complex geometries using the Ultrasonic Velocity Profiling (UVP) technique

Kotze, Reinhardt; Wiklund, Johan; Haldenwang, Rainer; Fester, Veruscha

doi:10.1016/j.flowmeasinst.2010.12.010

Cited by 23 publications

(21 citation statements)

References 39 publications

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“…This method of shear rate measurement is well established and documented in many published articles as [13, 30–32]. The shear rate presented is a measure on four bolus injections in the model cavity.…”

Section: Methodsmentioning

confidence: 99%

A Device that Models Human Swallowing

Stading

Waqas

Holmberg³

et al. 2019

Dysphagia

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The pharynx is critical for correct swallowing, facilitating the transport of both air and food transport in a highly coordinated manner, and aberrant co-ordination causes swallowing disorders (dysphagia). In this work, an in vitro model of swallowing was designed to investigate the role of rheology in swallowing and for use as a pre-clinical tool for simulation of different routes to dysphagia. The model is based on the geometry of the human pharynx. Manometry is used for pressure measurements and ultrasonic analysis is performed to analyze the flow profiles and determine shear rate in the bolus, the latter being vital information largely missing in literature. In the fully automated model, bolus injection, epiglottis/nasopharynx movement, and ultrasound transducer positioning can be controlled. Simulation of closing of the airways and nasal cavity is modulated by the software, as is a clamping valve that simulates the upper esophageal sphincter. The actions can be timed and valves opened to different degrees, resembling pathologic swallowing conditions. To validate measurements of the velocity profile and manometry, continuous and bolus flow was performed. The respective velocity profiles demonstrated the accuracy and validity of the flow characterization necessary for determining bolus flow. A maximum bolus shear rate of 80 s −1 was noted for syrup-consistency fluids. Similarly, the manometry data acquired compared very well with clinical studies.

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Section: Methodsmentioning

confidence: 99%

A Device that Models Human Swallowing

Stading

Waqas

Holmberg³

et al. 2019

Dysphagia

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show abstract

“…UVP is accepted as an important tool for measuring flow ABCM profiles in opaque liquids in research and engineering and it has been previously applied in complex geometries such as stirred tanks (Bouillard et al, 2001;Ein-Mozaffari and Upreti, 2009), contractions (Ouriev and Windhab, 2003;Kotzé et al, 2011), liquid metal target of neutron spallation source configuration (Takeda and Kikura, 2002), cylindrical hydrocyclone (Bergström and Vomhoff, 2004) as well as diaphragm valves (Kotzé et al, 2011). This highly versatile technique can also be used to determine fluid properties such as concentration profiles (Sad Chemloul et al, 2009), solid particle velocity as well as rheological properties.…”

Section: Uvp-pd Methods For In-line Rheological Characterizationmentioning

confidence: 99%

Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system

Haldenwang¹,

Kotze²,

Chhabra³

2012

J. Braz. Soc. Mech. Sci. & Eng.

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“…Its value is relative to the Mach number which is applied to account for specific flow conditions [3]. Testing such flowmeters also employs mathematical modeling, numerical methods and digital simulation [16,18,19]. This methodology was used e.g.…”

Section: Flowmeters and Test Stand Applied In Researchmentioning

confidence: 99%

Analysis of Applicability of Flow Averaging Pitot Tubes in the Areas of Flow Disturbance

Pochwała¹,

Pospolita²

2016

Metrology and Measurement Systems

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The issues connected with the complex design of various facilities, including up-to-date boiler equipment as well as the ways of organizing the space around them, are the reasons why there is often a lack of room for mounting a flowmeter in accordance with the recommendations of manufacturers. In most cases the problem is associated with ensuring sufficient lengths of straight pipe leading into and out of a flowmeter. When this condition cannot be fulfilled, the uncertainty of measurement increases above the value guaranteed by the manufacturer of the flowmeter. This sort of operation problem has encouraged the authors of this paper to undertake research aimed at the analysis of applicability of averaging Pitot tubes in the areas of flow disturbance.

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Measurement and analysis of flow behaviour in complex geometries using the Ultrasonic Velocity Profiling (UVP) technique

Cited by 23 publications

References 39 publications

A Device that Models Human Swallowing

A Device that Models Human Swallowing

Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system

Analysis of Applicability of Flow Averaging Pitot Tubes in the Areas of Flow Disturbance

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