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The analytical theory of a turbulent scalar, developed in previous papers [Phys. Fluids 28 (1985) 1299; J. Fluid Mech. 217 (1990) 203], is extended to the case of large Prandtl number. The fluctuation character of the least principal rate of strain γ has an important effect upon the scalar spectrum. The scalar variance spectrum in the viscous range isF (k) = 4.472(νε) 12χ k ...
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