Impuls‐ und Wärmeaustausch in freier Turbulenz

Abstract

Aus den Bewegungsgleichungen folgen Beziehungen über den Zusammenhang zwischen dem Austausch des Impulses und der Wärme in freier Turbulenz. Dieser Zusammenhang wird an den Beispielen des ebenen Nachlaufes und des ebenen Freistrahles auf Grund von Experimenten im einzelnen untersucht.

Comparison of different flame types /

“…The radial temperature curve based on the velocity distribution is computed using Eq. 1.13 given by Reichardt 16 . As it can be seen in Figure 3.34, the computed curve calculated according to Eq.…”

“…It was found that in the stagnation zone, the convective heat flux was mainly constant, while in the wall jet region the heat flux decreased with R. The dimensionless radius, R, of the stagnation zone was assumed to be R=0. 16. The concerning correlation is:…”

“…In section 1.1.6, Eq. 1.13 was given based on the experimental and theoretical work of Reichardt 16 . This equation gives the radial temperature distribution related to the radial velocity distribution.…”

Prandtl and the Göttingen school

“…The status of the knowledge of turbulence in 1941 is well summarized in [Wieghardt(1941), Wieghardt(1942E)], that between 1941 and 1944 in Prandtl's FIAT article entitled Turbulenz [Prandtl(1948a)]. Prandtl reviewed on twenty three tightly written pages the work at the KWI in chronological order and by these topics: Furthermore, Prandtl singled out the investigations on heat transfer in turbulent boundary layers by Reichardt [Reichardt(1944)], who applied ideas from earlier papers on turbulent transport of momentum in a free jet [Reichardt(1941), Reichardt(1942)]. Reichardt had found experimentally for a planar jet that the PDF of transverse variations of the streamwise velocity profile in the middle of a jet was Gaussian.…”

Heat and mass transfer to decelerating finely atomized sprays

“…••• (196) Due to the fact that the heat losses from the spray chamber were negligible and the atomi.zing air flow rate is negligible compared to that of the drying air, the following enthalpy balance based on a datum of 32°F Equation (197) may be simplified as:…”