&lt;title&gt;Prediction of PIV recording performance&lt;/title&gt;

Mengel, Finn; Moerck, Tue

doi:10.1117/12.150521

Cited by 3 publications

(4 citation statements)

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“…Durst et al indicated that upon observation of the scattering of light from spherical particles in LDA that the intensity ratio (I S 908)/(I S 08) of 908 scattered light to forward scattered light is a strong function of the size parameter d P /l 1 and of the refractive index m. 6 Mengel and Morck indicated that the ratio (I S 908)/(I S 08) decreases with increasing value of the size parameter d P / l 1 in an observation of scattering particles used in PIV. 27 To summarize, the resulting intensity of the scattered light for a given light sheet intensity will depend on the combined influences of C s and (I S 908)/(I S 08), which exhibit opposing tendencies with increasing particle size. In general however, Mengel and Morck indicated that larger particles will still give stronger signals.…”

Section: Tracer Particles and Seeding Of Flowmentioning

confidence: 99%

“…A study by Mengel and Morck illustrated the variation of C s as a function of the ratio of the particle diameter d p to the laser wavelength l 1 for spherical particles with a refractive index m0/1.6. 27 Mengel and Morck compared the approximate values for a diatomic molecule such as nitrogen or oxygen and two larger particles, and the results showed an enormous difference between the light-scattering crosssections of molecules and particles as small as 1Á10 mm.…”

Section: Tracer Particles and Seeding Of Flowmentioning

confidence: 99%

“…In general however, Mengel and Morck indicated that larger particles will still give stronger signals. 27…”

Section: Tracer Particles and Seeding Of Flowmentioning

confidence: 99%

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The application of particle tracking velocimetry as a velocity measurement technique

Campbell

2006

Building Services Engineering Research and Technology

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Within building drainage, waste and ventilation (DWV) systems, airflow measurement within and across the cross-section of the stack is problematic due to the multiphase and unsteady nature of the flow. This paper investigates the suitability for measurement of mixed-phase fluid flow in building (DWV) systems utilizing a particle tracking velocimetry (PTV) flow measurement technique. PTV is a non-intrusive optical flow measurement technique that supplies an instantaneous sample of velocity throughout a 2D plane in the flow field. The results of the PTV investigation can then be utilized for comparison with the results of previous investigations. Practical application: Development of a remote sensing technique capable of discriminating between phases in DWV stack systems would benefit researchers and code bodies by allowing more robust and comprehensive models to be developed. These models could be used in sensitivity tests for code changes.

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Section: Tracer Particles and Seeding Of Flowmentioning

confidence: 99%

Section: Tracer Particles and Seeding Of Flowmentioning

confidence: 99%

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The application of particle tracking velocimetry as a velocity measurement technique

Campbell

2006

Building Services Engineering Research and Technology

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“…A review of the most prominent optical velocimetry techniques, Hassan and Cannan, 13 namely laser Doppler anemometry (LDA), particle image velocimetry (PIV) and PTV, Maas et al 14 and Mengel and Morck 15 showed that PTV is suitable for this application. Analysis of the two-phase flow by imaging techniques, Dring 16 and Coupland and Halliwell 17 is particularly useful as the motion of the suspended phase matter can be tracked and recorded.…”

Section: Introductionmentioning

confidence: 99%

Experimental application of particle imaging to fluid velocity analysis in building drainage systems

Campbell

2011

Building Services Engineering Research and Technology

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Previous research into the hydraulic and pneumatic conditions in the pipework associated with building drainage waste and ventilation (DWV) systems has been interpreted as suggesting that the flow regime within the vertical stack consists of an annular water flow entraining a central air core with an associated pressure drop. However, previous evidence had suggested that a significant proportion of the water was found in the air core by Pink [A study of the effect of stack length on airflow in drainage stacks. BRE Current Paper, 1973; 38/73] and Wyly and Eaton [1961. Capacity of stacks in sanitary drainage systems for buildings. U.S. Department of Commerce, National Bureau of Standards, Monograph 3]. A new model has recently been proposed by Campbell and MacLeod [Investigation of the causative factors of airflow entrainment in building drainage-waste-ventilation (DWV) systems. Building Services Engineering Research Technology 1999; 20(3): 99-104] which suggests that the airflow entrainment is due to the distribution of work between the water annulus and the droplets falling in the central air core. This article describes the investigation of the velocity profile of mixed-phase fluid flow in building DWV systems utilising the particle tracking velocimetry (PTV) flow measurement technique previously established by Campbell [The application of particle tracking velocimetry as a velocity measurement technique. Building Services Engineering Research Technology 2006; 27(4): 327-40].PTV is a non-intrusive optical flow measurement technique that supplies an instantaneous sample of velocity throughout a two-dimensional plane in the flow field. The results of the PTV investigation support the assumption that water droplets exist in the air core and have a velocity greater than that of the water annulus. Practical application: This article describes the application of particle tracking velocimetry (PTV) to the interaction between air and water in typical building drainage waste and ventilation (DWV) systems. Results indicate an unexpected distribution of mass across the stack discharge which, together with the nature of the air/water interface, governs air movement. The technique of PTV is particularly suited to this area, and represents the first steps towards eventual refinement of mathematical models designed to simulate building DWV system behaviour. NomenclatureA area d diameter D c free diameter of wet stack f friction factor F s force due to shear stress 1 wavelength of laser light L stack length Q volumetric flow rate density R radius (of stack)

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Tracer particles and seeding for particle image velocimetry

Melling¹

1997

Meas. Sci. Technol.

898

417

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The size specifications for suitable tracer particles for particle image velocimetry (PIV), particularly with respect to their flow tracking capability, are discussed and quantified for several examples. A review of a wide variety of tracer materials used in recent PIV experiments in liquids and gases indicates that appropriately sized particles have normally been used. With emphasis on gas flows, methods of generating seeding particles and for introducing the particles into the flow are described and their advantages are discussed.

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<title>Prediction of PIV recording performance</title>

Cited by 3 publications

References 0 publications

The application of particle tracking velocimetry as a velocity measurement technique

The application of particle tracking velocimetry as a velocity measurement technique

Experimental application of particle imaging to fluid velocity analysis in building drainage systems

Tracer particles and seeding for particle image velocimetry

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