Riblets in fully developed turbulent channel flow

This database features high-precision pressure measurements in a wind tunnel facility used to determine the skin friction drag reduction of ribelts. Please refer to the README below for further information.

This database features high-precision pressure measurements in a wind tunnel facility used to determine the skin friction drag reduction of ribelts. Please refer to the README below for further information.

## RIBLETS IN FULLY DEVELOPED TURBULENT CHANNEL FLOW

This database features high-precision pressure drop and flow rate measurements in an air channel flow facility with aspect ratio 1:12 which were taken to determine the skin friction drag reduction of riblets. In this facility the channel flow is fully turbulent for bulk Reynolds numbers above 5000. The dataset includes values for the smooth wall reference case and three geometrically different sets of riblets. Multiple flow rate measurement devices are used (see table1), namely an inlet nozzle and an orifice flow meter. The measurements were taken by Andreas Güttler, Lars von Deyn and Luigi Coppini.

table1:

| type        | index | diameter  | range in Reb |
| -------- -- |-------|-----------|--------------|
| orifice     | 1     | 60[mm]    |3000<Reb<13000
| orifice     | 2     | 105[mm]   |7000<Reb<38000
| orifice     | 3     | 150[mm]   |30000<Reb<89000
| inlet nozzle| 4    | 60[mm]     |6000<Reb<24000

___

References:

A. Güttler. High accuracy determination of skin friction differences in an air
channel flow based on pressure drop measurements. PhD thesis, Karlsruhe Institute
of Technology, 2015.

DIN EN ISO 5167:Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full, 2004.

___

Content:
 
* reference results of smooth turbulent channel flow measured in the range of 5000<Reb<89000.  

* three geometrically different sets of ribelts measured in the range of 5000<Reb<89000.   

```
      _____s_____
     /\         /\   |
    /  \       /  \  |h
___/    \_____/    \_|___
```

table2:

|         | s[mu] |  h[mu]  |  tip angle  |   Reb_opt |
| ------- |-------|---------|-------------|-----------|
|set1     |614    |294      |53.5         | 11400     |
|set2     |170    |160      |50           | 50000     |
|set3     |86     |83       |51           | 97000     |



---
lars.deyn@kit.edu

davide.gatti@kit.edu

bettina.frohnapfel@kit.edu

RIBLETS IN FULLY DEVELOPED TURBULENT CHANNEL FLOW
This database features high-precision pressure drop and flow rate measurements in an air channel flow facility with aspect ratio 1:12 which were taken to determine the skin friction drag reduction of riblets. In this facility the channel flow is fully turbulent for bulk Reynolds numbers above 5000. The dataset includes values for the smooth wall reference case and three geometrically different sets of riblets. Multiple flow rate measurement devices are used (see table1), namely an inlet nozzle and an orifice flow meter. The measurements were taken by Andreas Güttler, Lars von Deyn and Luigi Coppini.
table1:



type
index
diameter
range in Reb




orifice
1
60[mm]
3000<Reb<13000


orifice
2
105[mm]
7000<Reb<38000


orifice
3
150[mm]
30000<Reb<89000


inlet nozzle
4
60[mm]
6000<Reb<24000




References:
A. Güttler. High accuracy determination of skin friction differences in an air
channel flow based on pressure drop measurements. PhD thesis, Karlsruhe Institute
of Technology, 2015.
DIN EN ISO 5167:Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full, 2004.

Content:


reference results of smooth turbulent channel flow measured in the range of 5000<Reb<89000.  

three geometrically different sets of ribelts measured in the range of 5000<Reb<89000.   

      _____s_____
     /\         /\   |
    /  \       /  \  |h
___/    \_____/    \_|___
table2:




s[mu]
h[mu]
tip angle
Reb_opt




set1
614
294
53.5
11400


set2
170
160
50
50000


set3
86
83
51
97000




lars.deyn@kit.edu
davide.gatti@kit.edu
bettina.frohnapfel@kit.edu