Experimental Investigation of the Time Effect of Pressure Fluctuations in Steady Turbulent Pipe Flows
Öz
In
the study, which performed experimentally, the behavior of time variation of
the static pressure in pipe water flows has been investigated in terms of pipe
diameter, flow rate and pipe roughness. In the experiments, five pipe types in
different materials and in different roughness were used. In the steady and
horizontal pipe water flows, which performed at low Reynolds numbers, the
static pressure at different tap locations which is longitudinally placed have
been measured. The water heights in the piezometer hoses, which is inserted on
pressure taps, has been recorded with a camera for three minutes for each flow
rates. A total of 21 snapshots were obtained from each camera recordings at
equal time intervals and the pressures were determined from that snapshot
images through water height readings. The sanpshots of any flow rate has shown
that all pressures at the tap locations fluctuate together over the time in the
same phase, frequency and amplitude. When RMS values, which shows the pressure
fluctuation in mean intensity over the time, was examined, it was observed that
the fluctuation amplitudes is independent of pipe roughness but has a relation
with velocity of the pipe flow.
Anahtar Kelimeler
Kaynakça
- Ansys Workbech, (2018) " CFX Help menu" Ansys student version Anselmet F. Ternat ,F. Amielh M. Boiron O. Boyer P. & Pietri L., 2009. "Axial development of the mean flow in the entrance region of turbulent pipe and duct flows".Elsevier C. R. Mecanique. 337, 573–584 Kerswell, R. R., 2005, “Recent Progress in Understanding the Transition to Turbulence in a Pipe,” Institute of Physics Publishing, Nonlinearity, 18, pp. R17–R44 Özışık N., 1985. "HEAT TRANSFER: a basic approach", MackGraw-Hill Book Co, international edition Reynolds, O., 1883, “On the Dynamical Theory of Incompressible Viscous Fluids and Determination of the Criterion,” Philos. Trans. R. Soc. London, 186, pp. 123–164. Willis, A. P., Peixinhoy, J., Kerswell, R. R., and Mullin, T., 2008, “Experimental and Theoretical Progress in Pipe Flow Transition,” Philos. Trans. R. Soc. London, Ser. A, 366_1876_, pp. 2671–2684. White F.M., 2003. "Fluid Mechanics", 5th edition, McGraw–Hill Book Co, New York Zagarola, M.V., and Smits, A. J., 1998, “Mean-Flow Scaling of Turbulent Pipe Flow,” J. Fluid Mech., 373, pp. 33–79. Ghajar, A.J. and Tam, L.M. (1995) Flow Regime Map for a Horizontal Pipe with Uniform Wall Heat Flux and Three Inlet Configurations. Experimental Thermal and Fluid Science; 10:287-297 Zanoun E.-S. and Egbers, C. (2016). Flow Transition And Development In Pipe Facilities Journal Of Engineering And Applied Science, Vol. 63, No. 2, PP. 141-155 Zimmer F., Zanoun E.S. and Egbers C. (2011). “A study on the influence of triggering pipe flow regarding mean and higher order statistics”. 13th European Turbulence Conference (ETC13) Journal of Physics: Conference Series, Volume 318, Section 3.
Öz
Kaynakça
- Ansys Workbech, (2018) " CFX Help menu" Ansys student version Anselmet F. Ternat ,F. Amielh M. Boiron O. Boyer P. & Pietri L., 2009. "Axial development of the mean flow in the entrance region of turbulent pipe and duct flows".Elsevier C. R. Mecanique. 337, 573–584 Kerswell, R. R., 2005, “Recent Progress in Understanding the Transition to Turbulence in a Pipe,” Institute of Physics Publishing, Nonlinearity, 18, pp. R17–R44 Özışık N., 1985. "HEAT TRANSFER: a basic approach", MackGraw-Hill Book Co, international edition Reynolds, O., 1883, “On the Dynamical Theory of Incompressible Viscous Fluids and Determination of the Criterion,” Philos. Trans. R. Soc. London, 186, pp. 123–164. Willis, A. P., Peixinhoy, J., Kerswell, R. R., and Mullin, T., 2008, “Experimental and Theoretical Progress in Pipe Flow Transition,” Philos. Trans. R. Soc. London, Ser. A, 366_1876_, pp. 2671–2684. White F.M., 2003. "Fluid Mechanics", 5th edition, McGraw–Hill Book Co, New York Zagarola, M.V., and Smits, A. J., 1998, “Mean-Flow Scaling of Turbulent Pipe Flow,” J. Fluid Mech., 373, pp. 33–79. Ghajar, A.J. and Tam, L.M. (1995) Flow Regime Map for a Horizontal Pipe with Uniform Wall Heat Flux and Three Inlet Configurations. Experimental Thermal and Fluid Science; 10:287-297 Zanoun E.-S. and Egbers, C. (2016). Flow Transition And Development In Pipe Facilities Journal Of Engineering And Applied Science, Vol. 63, No. 2, PP. 141-155 Zimmer F., Zanoun E.S. and Egbers C. (2011). “A study on the influence of triggering pipe flow regarding mean and higher order statistics”. 13th European Turbulence Conference (ETC13) Journal of Physics: Conference Series, Volume 318, Section 3.
Ayrıntılar
| Birincil Dil | İngilizce |
|---|---|
| Konular | Mühendislik |
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 19 Ağustos 2018 |
| Yayımlandığı Sayı | Yıl 2018 Sayı: 2 |
