Streamwise heat flux budget in the atmospheric surface layer

Bradley, E. F.; Antonia, R. A.; Chambers, A. J.

doi:10.1007/bf00116109

Cited by 9 publications

(1 citation statement)

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“…The streamwise heat-flux budget is, in steady, laterally homogeneous conditions, KU'V26',(21) which includes advection, four production terms (from wind and temperature gradients in the streamwise and vertical directions), two transport __ terms, a pressuregradient interaction term and molecular terms. As for the w'e' budget, we dismiss the molecular terms as negligible; Bradley, Antonia & Chambers (1982) have shown by measurement in the atmospheric surface layer that these terms are small in the u'e' budget. Figure 14 shows measurements a t x l h = 7.5,15 and 25 of the other terms in __ (31), including a residual measurement of the pressure term but excepting u'6' aa/ax, which effectively vanishes because aa/i3x x 0.…”

Section: The Ulel Budgetmentioning

confidence: 99%

Turbulent dispersion from an elevated line source: measurements of wind-concentration moments and budgets

Raupach

Legg

1983

J. Fluid Mech.

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Wind and tracer-concentration fluctuations, and hence the budgets for tracer variance, vertical flux and streamwise flux, have been measured in the dispersing plume from an elevated lateral line source in an equilibrium turbulent surface layer, using heat as a passive tracer. The results are analysed by testing closure assumptions for models of turbulent dispersion at first and second order. Except close to the source, a first-order (gradient-diffusion) model satisfactorily predicts both the vertical and streamwise tracer fluxes.The tracer-variance budget is essentially a balance between advection and dissipation, with production becoming significant as fetch increases. The vertical and streamwise heat-flux budgets have advection and turbulent-transport terms which are in balance (almost exactly for the vertical flux, only approximately for the streamwise flux), leaving balances between local production and pressure-gradient interaction. The turbulence-interaction component of the pressure term cannot be modelled as $-\overline{u^{\prime}_{i}\theta^{\prime}}/\tau, \overline{u^{\prime}_{i}\theta^{\prime}}$ being the flux vector and τ a scalar timescale.

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Section: The Ulel Budgetmentioning

confidence: 99%