The turbulent boundary layer on a rotating disk is studied with the aim of giving a statistical description of the azimuthal velocity field and to compare it with the streamwise velocity of a turbulent two-dimensional flat-plate boundary layer. Determining the friction velocity accurately is ...
This chapter discusses the simple case of the turbulent boundary layer in a constant pressure field and considers the complex problem of the effects of pressure gradients, and variable wall roughness. The concepts of boundary layer phenomena, in general, and turbulent boundary layers, in particular,...
The Turbulent Boundary Layer 来自 Elsevier 喜欢 0 阅读量: 437 作者: FH Clauser 摘要: This chapter discusses the simple case of the turbulent boundary layer in a constant pressure field and considers the complex problem of the effects of pressure gradients, and variable wall roughness. The ...
14 The Planetary Boundary Layer (PBL) is the lowermost region of troposphere and endowed with turbulent 15 characteristics, which can have mechanical and/or thermodynamic origins. Such behavior gives to this layer 16 great importance, mainly in studies about pollutant dispersion and weather forecasting...
Experimental results are presented for high Reynolds number turbulent boundary layers. A flat plate zero pressure gradient layer has been studied in a new high Reynolds number boundary layer tunnel. Measurements were made of the mean flow in the Reynolds number range of 3.6 × 103<Rθ< 6.0 ×...
The velocity field above a large spinning disk has been studied using pressure probes and hotwire anemometers. The flowfield consists of a three-dimensional boundary layer due to a crossflow caused by centrifugal forces. The mean flow in both the laminar and turbulent regimes compares well with ...
It is inferred that this approach will be also useful in turbulent regimes. Indeed, Coleman et al. (1990) observed that “the turbulent Ekman layer has more in common with the turbulent two-dimensional boundary layer than with the quasi-laminar Ekman layer (due especially to the lack of ...
The turbulent boundary layer on a porous plate: an experimental study of the fluid dynamics with injection and suction R. L. Simpson, R. J. Moffat, and W. M. Kays. The turbulent boundary layer on a porous plate: Experimental skin friction with variable injection and suction. Int. J. Hea...
The flow during transition from the laminar to a turbulent state in a boundary layer is best described through the distribution of the intermittency. In constant-pressure, two-dimensional flow, turbulent spots appear to propagate linearly; the hypothesis of concentrated breakdown, together with Emmons...
The turbulent/non-turbulent interface in anadverse pressure gradientturbulent boundary layeris explored. • The interface is extracted with an approach based on enstrophy criteria. • Thefractal dimensionof the interface is obtained by using the box-counting algorithm. ...