caa a22 4500 475777867 CHVBK 20180406123636.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1002794510020 doi (NATIONALLICENCE)springer-10.1023/A:1002794510020 Probability Density Function Integrals And Small-Scale Mixing In Turbulent Plumes [Elektronische Daten] [R. Brown, B. Sawford] We analyse cross-wind-integrated statistics of theconcentration field of a conserved scalar for pointand line sources in grid turbulence. In particular,using wind-tunnel measurements we calculate thecross-wind integrated probability density function(pdf) for the scalar concentration. We then use thatquantity in the exact evolution equation for the pdfto calculate the cross-wind integrated mean of therate of dissipation of scalar variance, conditional onthe scalar concentration. Much of the variation ofthese statistics with distance downstream is accountedfor by scaling with concentration, length and timescales based on the development of the mean plume.This scaling thus suggests some simple practicalparameterisations of these statistics in terms ofmean-field quantities. One of the motivations for thiswork is to find a simple parameterisation for thescalar dissipation that can be used for modellingchemical reactions in plumes. We also consider the cross-wind integral of the firstfew moments of the concentration field and show thatthe integration greatly simplifies the budgets forthese moments. Thus the first moment is just thedownstream flux of the scalar, which is constant. Thesecond moment budget provides a check on the meandissipation estimated directly from the pdf evolutionequation. Kluwer Academic Publishers, 2000 Conditional concentration statistics nationallicence Mixing nationallicence Scalar dissipation nationallicence Turbulence nationallicence Brown R. CSIRO Atmospheric Research, Private Bag 1, 3195, Aspendale, Australia aut Sawford B. CSIRO Atmospheric Research, Private Bag 1, 3195, Aspendale, Australia aut Boundary-Layer Meteorology Kluwer Academic Publishers 97/2(2000-11-01), 219-249 0006-8314 97:2<219 2000 97 10546 https://doi.org/10.1023/A:1002794510020 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002794510020 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brown R. CSIRO Atmospheric Research, Private Bag 1, 3195, Aspendale, Australia aut NATIONALLICENCE 700 1- Sawford B. CSIRO Atmospheric Research, Private Bag 1, 3195, Aspendale, Australia aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 97/2(2000-11-01), 219-249 0006-8314 97:2<219 2000 97 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer