Turbulent kinetic energy dissipation rate estimation from PIV velocity vector fields

Saarenrinne, Pentti; Piirto, M.

doi:10.1007/s003480070032

Cited by 138 publications

(95 citation statements)

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“…To investigate fluctuations, the turbulent kinetic energy (TKE) and its dissipation rate are often calculated from the 2D datasets, as shown by Saarenrinne and Piirto (2000), Müller et al (2010) and Druault et al (2005). By calculating the specific kinetic energy, the in-plane influence of the fuel injection on the flow is investigated as explained by Adrian et al (2000).…”

Section: Fluctuation Definitionmentioning

confidence: 99%

Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV

et al. 2012

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High-speed particle image velocimetry (HS-PIV) using hollow microspheres has been applied to characterize the flow in a heavy-duty diesel engine during and after fuel injection. The injection timings were varied in the range representing those used in premixed charge compression ignition (PCCI) regimes, and multiple injections have been applied to investigate their influence on the flow inside the combustion chamber. By injecting into pure nitrogen, combustion is avoided and the flow can be studied long after injection. The results show a sudden change of air motion at the start of injection as a result of the air entrainment at the core of the spray. Furthermore, as expected, spray injection causes a considerable increase in the cycle-to-cycle fluctuations of the flow pattern, the more so for longer injection durations.

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Section: Fluctuation Definitionmentioning

confidence: 99%

Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV

et al. 2012

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“…Based on PIV data, a large number of formulas can be used to calculate the turbulent kinetic energy and the turbulent dissipation rating, 10,19 especially the latter. Different calculating methods cause great differences.…”

Section: Calculating the Distribution Of Other Flow Field Parametersmentioning

confidence: 99%

Experimental study of the application of micro-PIV on the flow characteristics detection of micro-gap rotational flow field

et al. 2014

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For a micro-gap rotational flow field with a large horizontal extent, tiny gap and fast flow velocity, the two-dimensional images shot by the micro-scale Particle ImageVelocimetry(Micro-PIV) technique are not sufficient for the study of local or whole flow characteristics. In this paper, by establishing a test bench of a rotational flow field with the functions of driving, positioning, adjustment and sensing, all the local states of the micro-gap rotational flow field can be obtained by horizontally moving the rotating axis to observe point by point. While measuring some local flow fields, two-dimensional pictures are taken by adjusting the focusing height of the objective lens, and then superposed and interpolated according to their shooting order to obtain a quasi-three-dimensional distribution image of the local flow fields, thus obtaining the flow condition of the vertical section of the flow field. The position of the focusing plane and mutual distance are adjusted to realize the measurement of wall shear force in the flow field, providing a feasible reference method for detecting the rheological property of the gap flow field and the effect of surface drag reduction.

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“…The question now arises as to how the energy dissipation rate can be measured. The direct measurement of is very difficult, since it needs to capture precisely the smallest turbulent structures [20]. One of the main uncertainties is over the method employed and the approximations necessarily made to estimate the local dissipation rate of turbulent kinetic energy.…”

Section: Dissipation Rate Of Turbulent Kinetic Energy εmentioning

confidence: 99%

Energy Dissipation and Shear Rate with Geometry of Baffled Surface Aerator

Kumar

2010

Chem. Eng. Res. Bull.

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Abstract:The geometric parameters of surface aeration systems govern the process phenomena. The dissipation rate of turbulent kinetic energy (ε) and shear rate (γ) are the key process parameters for mixing in surface aerators. Present work by doing numerical computation by visimix analyzes the effect of geometric parameters (impeller diameter, cross-sectional area of the tank, liquid height, width of the baffle, rotor blade length and immersion height) on ε and γ . Analysis has been done by making the geometric parameters non-dimensionalized through rotor diameter. With an increase in liquid height and baffled width, there is an increase in the case of energy dissipation and shear rate values. In the case of tank area and blade length, it is vice versa. Energy dissipation and shear rate are not affected by the variation in immersion height of the impeller.

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Turbulent kinetic energy dissipation rate estimation from PIV velocity vector fields

Cited by 138 publications

References 0 publications

Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV

Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV

Experimental study of the application of micro-PIV on the flow characteristics detection of micro-gap rotational flow field

Energy Dissipation and Shear Rate with Geometry of Baffled Surface Aerator

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