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- W2116654480 abstract "Abstract Examination of experimental data for the spectral distribution of velocity (u and v) and temperature (θ) fluctuations in the fully turbulent region of heated pipe-flow has suggested a schematic representation which incorporates the essential features. Evidence is cited to suggest that the “−vθ” correlation coefficient maintains higher values than the “uv” coefficient at wave-numbers in the inertial subrange. The theory of Batchelor, Howells and Townsend, and limited evidence from experiments in mercury, then suggests the form of the “θ 2 ” spectra and “−vθ” cross-spectra in liquid metals. From this information, a limiting Peclet number is deduced, above which the correlation coefficient of v and θ should be a fairly weak function of Pe alone. An attempt to check this inference from published data for the RMS level of temperature fluctuations, and for the turbulent Prandtl number, proves inconclusive, because many of the correlation coefficients so estimated have values greater than unity. It is concluded that all these results for gq must therefore be in error. However, since there is no evidence of very low correlation coefficients, they almost certainly lie in the range 0.5 ×÷ 2 over a large proportion of the radius. Thus gq can be estimated for any fluid in which the fluctuations are induced by uniform heating, at least to within a factor of 2, using the analysis of this paper." @default.
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- W2116654480 date "1977-10-01" @default.
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- W2116654480 title "Turbulent temperature fluctuations in liquid metals" @default.
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- W2116654480 doi "https://doi.org/10.1016/0017-9310(77)90188-0" @default.
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