By Jose Antonio Fidalgo Sanchez
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The facility consists of a closed return pressure vessel containing a long test pipe downstream of flow conditioning and heat exchanging sections. By driving air compressed at up to 200 atm through the test pipe, fully-developed pipe flow is generated over a wide Reynolds number range, from ReD D 3:1 104 to 3:5 107 , where D is the pipe diameter, hU i is the area-averaged velocity, and is the kinematic viscosity. 84 mm. 4 mm. 1 m long pipe connected so that the inside surfaces were flush at each joint.
J. Fluid Mech. 615, 121–138 (2008). 17. F. J. McKeon, W. J. Smits, Scaling of the streamwise velocity component in turbulent pipe flow. J. Fluid Mech. 508, 99–131 (2004). 18. J. Adrian, Hairpin vortex organization in wall turbulence. Phys. Fluids 19, 041301 (2007). LDV Measurement Near a Rough Surface for a Turbulent Boundary Layer Takatsugu Kameda, Shinsuke Mochizuki, and Hideo Osaka Abstract LDV(Laser Doppler Velocimeter) measurement has been made close to a rough surface beneath an equilibrium boundary layer.
This illustrates the difficulty and uncertainty that can occur when predicting pressure losses introduced by the irregular surface roughness created during the manufacturing process. Turbulence in Pipe Flows with Small Relative Roughness 41 Fig. 7 Reconstructed friction factor relationship for using krms =D values determined from separate surface roughness samples (dashed lines). Solid line: smooth pipe correlation of , thick solid line: reconstructed relationship using the krms =D value determined from entire data set 9 Discussion and Conclusions A series of measurements of friction factor, mean velocity and turbulence statistics were performed in the flow through a commercial steel pipe (krms =D D 1=26;000) over a large Reynolds number range (7:6 105 to 20 106 ) covering the entire flow regime range from hydraulically smooth to fully rough.