# U-bend circular cross section

Authors: Azzola J., Humphrey J.A.C.,

Type: Experimental

Status:

Description

## Description

Turbulent isothermal flow in a 180 degree pipe bend. Several experimental works are available (1, 2) along with a number of numerical investigation (2, 4, 5). Reference 3 reports also a case with heat transfer. Results are compared with the above mentioned experimental results (velocity profiles at different section of the domain).

## Geometry definition

The geometry is presented in Fig. 1, with the following parameters:
• Diameter: %$D=0.0445\, m$%
• Radius of curvature of the bend: %$R_c/D=3.375$%
 Fig. 1: Geometry of the U-bend test case

## Flow Parameters

The flow parameters are the following

• Dynamic viscosity: %$\mu=1\cdot10^{-3}\, kg\, m^{-1}\, s^{-1}$%
• Density : %$\rho=1\cdot10^3\,kg/m^3$%
• Bulk velocity : %$U_b=1\,m/s$%
• Reynolds number : %$Re=4.45\cdot10^{4}$%

## Reference Publications

1. Azzola J., Humphrey J.A.C., Developing turbulent flow in a 180 degree curved pipe and its downstream tangent, Report LBL-17681, Material and Molecular Research Division, Lawrence Berkeley Laboratory, University of California.
2. Azzola J., Humphrey J.A.C., Iacovides H., Launder B.E., Developing turbulent flow in a U-bend of Circular Cross-Section : Measurement and Computation, Transaction of the ASME, Vol. 108, pp. 214-221, June 1986.
3. Baughn J.W., Iacovides H., Jackson D.C., Launder B.E., Local heat transfer measurements in turbulent flow around a 180 degree pipe bend, Journal of Heat Transfer, pp. 43-48, Vol. 109, 1987.
4. So R.M.C. , Zhang H.S., Lai Y.G., Secondary cells and separation in developing laminar curved pipe flow, Theoretical and Computational Fluid Dynamics, pp. 141-162, 1991.
5. So R.M.C., Zhang H.S., Lai Y.G., Turbulence driven secondary flow in a curved pipe Theoretical and Computational Fluid Dynamics, pp. 163-180, 1991.

## Results

Simulation results available for this case:
Code Version Author Restrictions
Code_Saturne 2.0-beta2 A. Defossez - D. Sénéchal AccessEDFGroup
Number of topics: 1

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Topic attachments
I Attachment Action Size Date Who Comment
pdf config.pdf manage 8.3 K 2010-09-16 - 17:07 StefanoRolfo
png config.png manage 10.8 K 2010-09-16 - 17:20 StefanoRolfo reference geometry
EXT configpng manage 18.6 K 2010-09-16 - 17:17 StefanoRolfo reference geometry
png maillage_std.png manage 63.8 K 2010-09-16 - 17:08 StefanoRolfo
Topic revision: r38 - 2011-09-02 - 12:07:37 - DavidMonfort
CfdTm Web
12 Dec 2019

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