Turbulent scalar transport correlation behind a line heat source in a uniform shear flow

Kyong, Nam-Ho; Chung, Myung Kyoon

doi:10.1007/bf02971651

Cited by 2 publications

(2 citation statements)

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“…However, further downstream the profiles appear to be shifted towards the region of lower velocity with the position of the peak mean temperature also shifting in the same direction. A similar observation was made by Nakamura et al (1986) for diffusion from a point source in a uniform shear flow and by Kyong & Chung (1987 a). The observation of symmetric profiles by Stapountzis & Britter (1987) is compatible with the present results, if one considers that their measurements did not extend sufficiently far from the source, where the effect of shear on diffusion would be measurable.…”

Section: The Mean Temperature Fieldsupporting

confidence: 93%

Measurements of heat diffusion from a continuous line source in a uniformly sheared turbulent flow

Karnik

Tavoularis

1989

J. Fluid Mech.

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The diffusion of a passive scalar (heat) from a continuous line source placed in a uniformly sheared, nearly homogeneous, turbulent shear flow is examined. Measurements indicate that the mean temperature profile is approximately Gaussian near the source but, further downstream, it becomes asymmetric and its peak shifts towards the region of lower velocity. The r.m.s. temperature fluctuation profile is double peaked close to the source, it is single peaked at intermediate distances and it demonstrates a re-emergence of double peaks which grow in relative magnitude far away from the source. In comparison to similar experiments in isotropic turbulence, the centreline mean temperature appears to have a comparable decay rate, whereas the centreline mean-square temperature fluctuations appear to decay at a faster rate. The spread of the plume is faster than that in isotropic turbulence. The measured turbulent heat fluxes and triple temperature-velocity correlations demonstrate self-similar features. The development of temperature integral lengthscales and microscales is comparable to that in other heated, uniformly sheared flows, while the temperature p.d.f. and the temperature-velocity joint p.d.f. are distinctly non-Gaussian, especially away from the centreline. The relative magnitudes of the two measured components of the turbulent diffusivity tensor are in agreement with earlier measurements.

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Section: The Mean Temperature Fieldsupporting

confidence: 93%

Measurements of heat diffusion from a continuous line source in a uniformly sheared turbulent flow

Karnik

Tavoularis

1989

J. Fluid Mech.

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“…Other studies that focussed on modelling the thermal dispersion from a line source are those of Kyong and Chung (1987), who incorporated a composite time scale in the gradient transport model for a homogeneous shear flow, Cho and Chung (1997), who used a second order Reynolds stress / heat flux closure model for uniform shear flow, and Wang and Komori (1999) who compared a second moment closure model with an algebraic stress and flux model for dispersion in a turbulent boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation of Dispersion from Line Sources in a Turbulent Channel Flow

Boppana

Xie

Castro

2011

Flow Turbulence Combust

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Large-eddy simulations of the dispersion from scalar line sources at various locations within a fully developed turbulent channel flow at Re = uh/ν = 10400 are presented. Both mean and fluctuating scalar quantities are compared with those from the single available set of experimental data (Lavertu and Mydlarski, 2005) and differences are highlighted and discussed. The results are also discussed in the context of scalar dispersion in other kinds of turbulent flows, e.g. homogeneous shear-flow. Initial computations at a much lower Reynolds number are also reported and compared with the two available direct numerical simulation data sets.

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Turbulent scalar transport correlation behind a line heat source in a uniform shear flow

Cited by 2 publications

References 12 publications

Measurements of heat diffusion from a continuous line source in a uniformly sheared turbulent flow

Measurements of heat diffusion from a continuous line source in a uniformly sheared turbulent flow

Large-Eddy Simulation of Dispersion from Line Sources in a Turbulent Channel Flow

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