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1
Issues in Mechanical Engineering: 2011 Edition
“Laser Doppler anemometry measurements of the mean velocity and Reynolds
stresses are carried Out for a rough-surface favourable pressure gradient
turbulent boundary layer. The experimental data is compared with smooth
favourable ...
2
Advanced Engineering Fluid Mechanics
Consider the case of a favourable pressure gradient where dp/dx < 0. We
observe from Equation 5.78 that (92u/9y2)wajj < 0. As we proceed towards the
free stream, the velocity u approaches Uoo asymptotically. Consequently {du/dy)
...
K. Muralidhar, Gautam Biswas, 2005
3
Turbulent Flows: Fundamentals, Experiments and Modeling
A favourable pressure gradient reduces the hydrodynamic boundary-layer
thickness while an adverse pressure gradient increases its value.8 Besides the
thickness, pressure gradient has a direct effect on turbulence levels, increasing it
when ...
G. Biswas, V. Eswaran, 2002
4
Fluid Mechanics And Machinery
Flow through a converging passage, for instance, is under a favourable pressure
gradient. The pressure decreases in the direction of flow to accommodate the
rising K.E. The opposite of the above phenomenon represents adverse pressure
...
Durgaiah D. Rama, D Rama Durgaiah, 2007
From these profiles it can be seen that for z/6 W 0.5 the effect of a favourable
pressure gradient is to decrease the level ... the Reynolds stress at z/6~O.S — To
isincreased by a favourable pressure gradient and decreased by an adverse one
.
6
Engineering Fluid Mechanics
If the pressure gradient is negative (i.e., dp/dx < 0), the pressure drops in the
direction of flow and is called favourable pressure gradient. The pressure
increases in the direction of flow, if the pressure gradient is positive (i.e., dp/dx >
0) which is ...
7
Tackling Turbulent Flows in Engineering
boundary-layer, termed as the favourable pressure gradient, cannot lead to flow
separation as it adds the flow or in other words competes with the retarding
effects of the viscosity. In the same way, an increasing pressure in the flow
direction ...
For example, the present observations suggest that the boundary layer is subject
to an adverse pressure gradient during the uprush and a favourable pressure
gradient during the backwash, again opposite to those that follow from Puleo et al
.
Agustín Sánchez-Arcilla, 2006
9
Progress in Industrial Mathematics at ECMI 2006
Preliminary results, in agreement with 3D-DNS, have indicated that an adverse
pressure gradient is destabilising, whereas a favourable pressure gradient is
stabilising. A pressure gradient is applied by considering the potential flow
around a ...
Luis L. Bonilla, Miguel Moscoso, Gloria Platero, 2007
10
Fluid Mechanics and Transfer Processes
If dp/dx is negative, representing a falling or favourable pressure gradient, it will
be seen from (7.5.2) that d2u/dy2 is negative at y = 0 and that the velocity profile
therefore takes the form indicated in figure 57(6). If, on the other hand, dp/dx is ...
John Menzies Kay, R. M. Nedderman, 1985
