cases:case072

Turbulent Pipe Flow with Swirl

Water flows along a straight pipe are considered with two types of swirl: “wall jet” (WJ hereafter) and “concentrated vortex” (CV hereafter), as shown in figure 1. These names are based on the initial conditions of the measurement series.

The pipe diameter is $D=70$ mm, and the pipe wall is hydraulically smooth.

For each of the initial conditions WJ and CV, two Reynolds numbers have been considered: $Re_D=50,000$ and $300,000$, based on the bulk velocity (measured with a magnetic flowmeter) and on the pipe diameter $D=70$ mm.

Profiles of mean velocity and Reynolds stresses have been measured at a number of streamwise locations up to $x/D$ of 75 or greater.

Fig. 1: Flow configurations

The data have been obtained with a 2-component laser-Doppler system, the fluids being water. The total velocity vector and Reynolds stress tensor have been obtained by performing three measurements in each point, with the laser-Doppler system aligned under three different angles within the azimuthal plane, i.e. the plane perpendicular to the pipe axis. See chapters 3 and 4 of Steenbergen (1995).

The data contain profiles of mean velocities and Reynolds stresses at a number of streamwise locations for each flow case.

Sample plots of selected quantities are available.

All data are presented in nondimensional form: mean velocities are scaled with the bulk velocity, Reynolds stresses are scaled with the bulk velocity squared. Radial positions (measured from the pipe axis) are scaled with the pipe radius $R$, while the axial positions of the measurement planes are scaled with the pipe diameter $D$. The data are expressed in a cylindrical coordinate system, with the velocity components into the axial, azimuthal and radial direction denoted by $U$, $W$ and $V$, respectively.

The filenames consist of 6 or 8 characters, and the extension .dat. The 6 or 8 characters have the following meaning:

 1: type of initial condition: “w” = WJ, “c” = CV Reynolds number $Re_D$: “5” = 50,000; “3” = 300,000 quantity: “m” = mean velocity; “r” = Reynolds stress distance from reference plane, expressed in $x/D$ (times 10) Optional. Reference to angle of traversing line, for data not taken on the horizontal plane.

For example, file c5r043.dat contains the Reynolds stresses at $x/D=4.3$, for the “concentrated vortex” at a Reynolds number of 300,000. The file named w5m552a1.dat refers to the “wall jet”, $Re_D=50,000$, $x/D=55.2$, mean velocities, measured along a line under angle with the horizontal direction (positive in the anticlockwise sense), referred to as a1 in the table below. The following non-zero angles of the traversing lines have been used:

 name angle (o) a1 a2 a3 a4 a5 5 -65 17 -73 -67

A few of the mean velocity files contain additional data points in a denser grid, see fig. 5.5 of Steenbergen (1995). These points have been placed below the columns of the other data points in the files. grid.

Concentrated Vortex Case
$Re=50,000$ $Re=300,000$
Location Mean velocity Reynolds stresses Mean velocity Reynolds stresses
$x/D=4.3$ c5m043.dat c5r043.dat c3m043.dat c3r043.dat
$x/D=7.7$ c5m077.dat c5r077.dat c3m077.dat c3r077.dat
$x/D=11.5$ c5m115.dat c5r115.dat c3m115.dat c3r115.dat
$x/D=21.3$ c5m213.dat c5r213.dat c3m213.dat c3r213.dat
$x/D=28.1$ c5m281.dat c5r281.dat c3m281.dat c3r281.dat
$x/D=34.9$ c5m349.dat c5r349.dat c3m349.dat c3r349.dat
$x/D=48.5$ c5m485.dat c5r485.dat c3m485.dat c3r485.dat
$x/D=75.6$ c5m756.dat c5r756.dat c3m756.dat c3r756.dat
Wall Jet Case
$Re=50,000$ $Re=300,000$
Location Mean velocity Reynolds stresses Mean velocity Reynolds stresses
$x/D=4.4$ w5m044.dat w5r044.dat w3m044.dat w3r044.dat
$x/D=7.6$ w5m076.dat w3m076.dat w3r044.dat
$x/D=9.6$ w5m096.dat w5r096.dat w3m096.dat w3r096.dat
$x/D=14.5$ w5m145.dat w5r145.dat w3m145.dat w3r145.dat
$x/D=28.1$ w5m281.dat w5r281.dat w3m281.dat w3r281.dat
$x/D=28.1$, $\theta=-65^o$ w3m281a2.dat w3r281a2.dat
$x/D=55.2$, $\theta=5^o$ w5m552a1.dat w5r552a1.dat
$x/D=55.2$, $\theta=17^o$ w3m552a3.dat w3r552a3.dat
$x/D=55.2$, $\theta=-73^o$ w3m552a4.dat w3r552a4.dat
$x/D=96.0$ w5m960.dat w5r960.dat w3m960.dat w3r960.dat
$x/D=96.0$, $\theta=-67^o$ w3m960a5.dat w3r960a5.dat
1. Steenbergen, W. (1995). Turbulent pipe flow with swirl. PhD Thesis, Eindhoven University of Technology.

Indexed data:

case072 (dbcase, confined_flow)
case072
titleTurbulent pipe flow with swirl
authorSteenbergen
year1995
typeEXP
flow_tagaxisymmetric, swirl, constant_cross_section