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Unsteady skin friction experimentation in a large diameter pipeVardy, Alan E., 1945- ...Experimental data for the validation of theoretical models of unsteady skin friction are limited and are available only for a few low Reynolds number flow cases. There is a strong need for detailed ... measurements in flows at high Reynolds numbers. In addition, there is a need for a wider range of well-controlled acceleration/deceleration rates and detailed visualization of flow structure and profiles. To address these needs, a large-scale pipeline apparatus at Deltares, Delft, The Netherlands, has been used for unsteady skin friction experiments including acceleration, deceleration and acoustic resonance tests. The apparatus consists of a constant head tank, a horizontal 200 mm diameter pipe of changeable length (44 to 49 metres) and a control valve at the downstream end. In addition to standard instrumentation, two distinctive instruments have been used: hot-film wall shear stress sensors ("direct" measurement of wall shear stress) and a PIV set-up for measurement of unsteady flow profiles. This paper describes the test rig, the instrumentation layout and the test programme. Finally, some initial test results are presented and discussed.Vir: Proceedings of the 3rd IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, Brno, October 14-16, 2009 (Str. 593-602)Vrsta gradiva - prispevek na konferenciLeto - 2009Jezik - angleškiCOBISS.SI-ID - 11273243
Avtor
Vardy, Alan E., 1945- |
Bergant, Anton |
He, Shuisheng |
Ariyaratne, Chanchala |
Koppel, Tiit |
Annus, Ivar |
Tijsseling, Arris S. |
Hou, Qingzhi
Teme
cevovodi |
pojemajoč tok |
pospešujoč tok |
gibanje tekočin |
kapljevinsko trenje |
pipelines |
decelerating flow |
accelerating flow |
oscillatory flow |
unsteady skin friction
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Vardy, Alan E., 1945- | ![]() |
Bergant, Anton | 03923 |
He, Shuisheng | ![]() |
Ariyaratne, Chanchala | ![]() |
Koppel, Tiit | ![]() |
Annus, Ivar | ![]() |
Tijsseling, Arris S. | ![]() |
Hou, Qingzhi | ![]() |
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