Square-Section Duct 180 Degree Bend

Experiments by Choi

Description

Turbulent flow in a square cross-section duct made of a 180^o bend and two long straight inlet and outlet parts. 3D flow with constant temperature.

Geometry of the Computational Domain

180^o bend section connected to straight inlet and outlet tangents, all of square section: D × D = 88.9 × 88.9 mm. Centreline curvature radius of the bend: R_c = 3.357D.

Flow Parameters

Air at standard conditions.

• Kinematic viscosity: = 1.72×10^-5 m²/s.
• Inlet bulk axial velocity W_B = 11 m/s.
• Reynolds number based on the bulk axial velocity W_B: Re = W_BD/ = 56,690.

Inflow Conditions

The following measurements are available for the cross section located at z = -D. They correspond to a fully developed turbulent in a square section duct.

Contour maps as f(x,y) of:

• First order moments: U, V, W
• Second order moments
• Turbulent kinetic energy: k/W_B² (deduced)

Additional values of k and issued by numerical simulations are also available in the file input.

Experimental Details

Velocity measurements using a rotatable hot-wire probe.

Measurement Errors

Analyzed but no published values.

Available Measurements

Previous and Reference Numerical Solutions

None available yet.

Main References