Time-Resolved Thermography of Impinging Water Jet

Znamenskaya, I. A.; Koroteeva, E. Yu.

doi:10.1615/jflowvisimageproc.2014010369

Cited by 6 publications

(5 citation statements)

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“…The impingement time was 3 minutes. The vessel was a polypropylene container with a wall thickness of 2 mm partially transparent to the IR radiation [3]. In experiments with two intersecting jets ( Fig.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…The recent improvement of the IR cameras in terms of their temporal and spatial resolutions made it possible to acquire the thermal patterns from the surface with the rate up to hundreds of frames per second. This allowed for capturing fast changes in the thermal behavior of flows and, hence, for quantitative studies of unsteady thermal processes including flow turbulence [3].…”

Section: Introductionmentioning

confidence: 99%

“…A vast variety of techniques and methods, both numerical and experimental, has been used to address the different aspects of turbulence and turbulent flows. Recently, a new research technique has been proposed to study non-isothermal pulsations of turbulent water boundary layers based on highspeed thermographic measurements through IR-transparent windows [3,4]. Since a thin layer of liquid water absorbs almost all the IR-radiation, the time-evolving temperature maps of near-wall boundary layers can be recorded by using IR-transparent vessel walls.…”

Section: Introductionmentioning

confidence: 99%

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Thermographic Analysis of a Turbulent Nonisothermal Water Boundary Layer

Znamenskaya

Koroteeva

Shagiyanova

2019

J Flow Vis Image Proc

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The paper is devoted to the investigation of the turbulent water boundary layer in the jet mixing flows using high-speed infrared (IR) thermography. Two turbulent mixing processes were studied: a submerged water jet impinging on a flat surface and two intersecting jets in a round disc-shaped vessel. An infrared camera (FLIR Systems SC7700) was focused on the window transparent for IR radiation; it provided highspeed recordings of heat fluxes from a thin water layer close to the window. Temperature versus time curves at different points of water boundary layer near the wall surface were acquired using the IR camera with the recording frequency of 100 Hz. The time of recording varied from 3 till 20 min. The power spectra for the temperature fluctuations at different points on the hot-cold water mixing zone were calculated using the Fast Fourier Transform algorithm. The obtained spectral behavior was compared to the Kolmogorov "-5/3 spectrum" (a direct energy cascade) and the dual-cascade scenario predicted for quasi-2D turbulence (an inverse energy cascade to larger scales and a direct enstrophy cascade to smaller scales).

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermographic Analysis of a Turbulent Nonisothermal Water Boundary Layer

Znamenskaya

Koroteeva

Shagiyanova

2019

J Flow Vis Image Proc

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“…Here, we use a configuration of a single round submerged water jet impinging on a flat plate to study the flow within a thin boundary layer using infrared (IR) thermography. The experimental technique is based on thermal imaging of fluctuations in infrared radiation emitted from turbulent water boundary layers [5,6]. Focusing an IR camera on the inner side of an IR-transparent window allows recording heat fluxes from a thin near-wall water layer since liquid water itself is highly absorptive in the mid-wave IR waveband.…”

Section: Introductionmentioning

confidence: 99%

Estimating turbulent boundary layer characteristics by high-speed infrared thermography

Koroteeva¹,

Znamenskaya²,

Novinskaya³

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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We propose a new methodology for the quantitative analysis of fluid boundary layers based on high-speed thermographic measurements. The methodology is tested on a boundary-layer flow formed by a single submerged round jet impinging on an infrared-transparent flat plate. We calculate the power spectra of fluctuations in thermal radiation recorded from a thin near-wall boundary layer for a wide range of initial flow parameters. The results show that changes in power spectra scaling can be directly related to the transitions in a flow pattern within the boundary layer.

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Section: Introductionmentioning

confidence: 99%

High-speed IR thermography of submerged turbulent water jets

Znamenskaya¹,

Koroteeva²,

Novinskaya³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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This work explores the potential of high-speed infrared (IR) thermography to analyze a turbulent water boundary layer in submerged jet flows. In the experiments, the IR camera (FLIR Systems SC7700) is focused on the inner side of an IR-transparent vessel window, providing high-speed (100 Hz) recordings of heat fluxes from a thin water layer close to the window. The temperature variations are shown to act as a passive tracer in the considered turbulent flows. The power spectra of the turbulent fluctuations are calculated for different points in the near-surface flows and compared to the existing theoretical turbulence models.

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Time-Resolved Thermography of Impinging Water Jet

Cited by 6 publications

References 0 publications

Thermographic Analysis of a Turbulent Nonisothermal Water Boundary Layer

Thermographic Analysis of a Turbulent Nonisothermal Water Boundary Layer

Estimating turbulent boundary layer characteristics by high-speed infrared thermography

High-speed IR thermography of submerged turbulent water jets

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