Abstract
Measurements are reported of triple moments of velocity and temperature in a heated asymmetric two-dimensional turbulent jet involving velocity fluctuations in the x 1 − x 2 plane. The data thus obtained have been compared with those given by alternative algebraic models of the triple moments losing, in the model formulae, experimental values of the second-moment quantities and the dissipation rate of kinetic energy. The study supports the view that in strongly asymmetric flows the contribution of mean temperature gradients to the triple moments can be appreciable. The comparison also provides some support for the use of the generalized gradient transport hypothesis in approximating dissipation of the triple moments.
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Abbreviations
- d :
-
width of exit slot
- d ijk :
-
diffusion of \(\overline {{u_i}{u_j}{u_k}}\) (likewise for velocity-temperature 3rd moments; subscript identifies quantity)
- k :
-
turbulence kinetic energy
- l γu :
-
x 2 distance between the positions where γ u = 1/2
- l yu :
-
u 2 distance between the positions where γ θ = 1/2
- p :
-
fluctuating pressure
- P ij :
-
generation rate of Reynolds stress
- P ijk :
-
generation rate of \(\overline {{u_i}{u_j}{u_k}}\) due to Reynolds stress gradients (1) and mean strain (2)
- q′:
-
\(\sqrt {2k}\)
- T :
-
turbulent time scale (k/ε)
- u i :
-
fluctuating velocity
- U i :
-
mean velocity
- U :
-
mean stream wise velocity (in x 1 direction)
- u′, υ′, w′:
-
rms velocity fluctuations in x 1, x 2 and x 3 directions
- x 1 :
-
sreamwise coordinate
- x 2 :
-
cross stream Cartesian coordinate
- x 2m :
-
x 2 position of velocity maximum
- x 2θ :
-
x 2 position of temperature maximum
- γ u :
-
intermittency of turbulent velocity signal
- γ θ :
-
intermittency of turbulent temperature sequal
- ε :
-
dissipation rate of turbulence energy
- ε ijk :
-
“dissipation” rate of \(\overline {{u_i}{u_j}{u_k}}\)
- η u :
-
(x 2 − x m ) /lγ u
- η θ :
-
(x 2 − x 2θ ) /lγ θ
- v :
-
kinematic viscosity
- ϱ :
-
density of fluid
- θ :
-
fluctuating temperature
- θ′:
-
\(\sqrt {{{\overline \theta }^2}}\)
- Θ :
-
mean temperature
- ΔΘ :
-
temperature above ambient
- ΔΘ m :
-
maximum temperature difference across jet
- ϕ ijk :
-
non-dispersive pressure correlation in \(\overline {{u_i}{u_j}{u_k}}\)
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Dekeyser, I., Launder, B.E. (1985). A Comparison of Triple-Moment Temperature-Velocity Correlations in the Asymmetric Heated Jet with Alternative Closure Models. In: Bradbury, L.J.S., Durst, F., Launder, B.E., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69996-2_8
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