### Computational Analysis of Flow Structure in a Curved Subsonic Diffusing Duct

^{(*)}

*Corresponding author*

**DOI's assignment:**

*the author of the article can submit here a request for assignment of a DOI number to this resource!*

**Cost of the service: euros 10,00 (for a DOI)**

#### Abstract

In the present investigation the distribution of mean velocity, static pressure and total pressure are experimentally studied on a C-shape diffuser of 40° angle of turn with an area ratio of 1.284 and centerline length was chosen as three times of inlet diameter. The experimental results then were numerically validated with the help of Fluent and then a series of parametric investigations are conducted with same centre line length and inlet diameter but with different area ratios varying from 1.25 to 2.0 and angle of turn 30° to 75°. The measurements were taken at Reynolds number 2.25 × 105 based on inlet diameter and mass average inlet velocity. Predicted results of coefficient of mass averaged static pressure recovery (48%) and coefficient of mass averaged total pressure loss (12%) are in good agreement with the experimental results of coefficient of mass averaged static pressure recovery (45%) and coefficient of mass averaged total pressure loss (11%) respectively. Standard k-ε model in fluent solver was chosen for validation. From the parametric investigation it is observed that for the increase in area ratio from1.25 to 2.0, static pressure recovery increases sharply but with the increase of angle of turn pressure recovery decreases steadily. The coefficient of total pressure loss almost remains constant with the change in area ratio and angle of turn for similar inlet conditions. *Copyright © 2013 Praise Worthy Prize - All rights reserved.*

#### Keywords

#### Full Text:

PDF#### References

G. S. Williams, C.W. Hubbell and G.H. Fenkell, Experiments at Detroit, Mich, on the effect of curvature upon the flow of water pipes. Trans. ASCE, Vol..47, pp. 1-196, 1902.

W. R. Dean, Note on the Motion of Fluid of Curved Pipe. Philosophical Magazine, Vol. 20, pp. 208-223, 1927.

W. R. Dean, The Streamline Motion of Fluid in a Curved Pipe. Philosophical Magazine, pp. 673-693, 1928.

M. Rowe, Measurement and computations of flow in pipe bends. Journal of Fluid Mechanics, Vol. 43, pp. 771-783, 1970.

M. M., Enayet, M.M., Gibson, A.M.K.P Taylor,. and M. Yianneskis, Laser Doppler measurements of Laminar and Turbulent Flow in a Bend. Int. Journal of Heat and Fluid Flow, Vol..3, pp. 211-217, 1982..

J. Kim and V.C. Patel, Origin and Decay of Longitudinal Vortices in the Development of flow in a Curved Rectangular Duct. Trans ASME, Journal of Fluid Engineering, Vol. 116, pp. 45-52, 1994.

Stanitz, J.D. Design of Two Dimensional Channels with Prescribed Velocity Distribution along the Channel Walls. NACA Report No. 115, 1953.

R.W. Fox, and S.J. Kline, Flow Regimes in Curves Subsonic Diffuser. Trans ASME, Journal of Basic Engineering, Vol. 84, pp. 303 – 316, 1962.

D.J Parson and P.G. Hill Effect of Curvature on Two Dimensional Diffusing flow. Trans. ASME, Journal of fluid engineering, Vol. 95, pp. 1–12, 1973.

O. J. Mcmillan, Mean Flow Measurements of the Flow Diffusing Bend. NASA Contractor Report 3634, 1982,

B., Majumdar, S.N Singh and D.P Agrawal,. Flow characteristics in a large area curved diffuser. Proc. I Mech E, Journal of Aerospace Engineering, Vol. 210, pp. 65 – 75, 1996.

M .I. Yaras, Effects of Inlets Conditions in the Flow in a Fishtail Diffuser with Strong Curvature. Trans. ASME, Journal of Fluid Engineering, Vol. 118, pp. 772 – 778, 1996.

B., Majumdar, R. Mohan, S.N. Singh and D.P. Agrawal, Experimental study of Flow in a high Aspect ratio 90° Curved Diffuser.. Trans. ASME, Journal of Fluids Engineering, Vol. 120, pp. 83 – 89, 1998.

B., Majumdar, S. N. Singh, and D.P. Agrawal, Flow Structure in a 180° Curved Diffusing Ducts, The Arabian journal of science and technology, Vol. 24, pp. 79–87, 1999.

P. K. Sinha., A. N. Mullick, B. Halder and B. Majumdar, A Parametric Investigation of Flow through an Annular Curved Diffuser, (2010) International Review of Aerospace Engineering (IREASE), 3 (5), pp. 249-256.

A.K. Biswas, Prasanta. K. Sinha., A. N. Mullick and B. Majumdar, CFD Investigation of Flow through a Constant area Curved Duct, (2012) International Review of Mechanical Engineering (IREME), 6 (7), pp. 1654-1660.

A. F. Elsafty, M. M. Abo Elazm, Improving Air Quality in Enclosed Parking Facilities Using Ventilation System Design with the Aid of CFD Simulation, (2009) International Review of Mechanical Engineering (IREME), 3 (6), pp. 796-807.

A.M Ahmed,. M. Ahmad and A. Rahim, Numerical Prediction of Effect on Air Flow Rate in the Presence of Heated Obstruction within a Room, (2009) International Review of Mechanical Engineering (IREME), 4 (6), pp. 702-710.

A. J. Benin, F. Gul and E. Pasqualotto, Loss Correlations for Developing Turbulent Pipe Flow, (2007) International Review of Mechanical Engineering (IREME), 1 (1), pp. 18-24.

M. Kahrom, and A. Shokrgozar, Evaluation of Turbulence Models in Predicting Turbulence Penetration into Low Reynolds Number Regions, (2010) International Review of Mechanical Engineering (IREME), 4 (1), pp. 51-59.

D. Chowdhoury, Modelling and calibration of pressure probes. M.E Thesis, Jadavpur University. 2007.

S. Mukhopadhyay, A. Dutta, A. N. Mullick and B. Majumdar, Effect of Five-hole probe tip shape on its calibration. Journal of the Aeronautical Society of India. 2001.

### Refbacks

- There are currently no refbacks.

Please send any question about this web site to info@praiseworthyprize.com**Copyright © 2005-2023 Praise Worthy Prize**