Journal of Applied and Computational Mechanics

Analytical Solutions and Analyses of the Displacement ‎Separating Point in Diffusers

Document Type : Research Paper

Authors

1 Department of Mechanical Engineering, Tafresh University, Tafresh, P.O. Box 39518-79611, Iran‎

2 Department of Mechanical Engineering, Kashan University, Kashan, Iran

Abstract

The main purpose of this study is to develop an understanding of the turbulent boundary layer calculation to analyze displacement of the separating point in diffusers. An approximate method has been used which is based on an analogy with the rheological power law and is applied in the study of non-linear viscous flows. At first, the method has been validated with the experimental data in the same experimental cases study. An appropriate geometric with and without the Nano-fluids in the straight-wall and curved-wall conical diffusers has been investigated. Its analyses output was compared with the results obtained by a numerical code. Also, the proposed method is more practical and can be used in diffuser design procedures.

Keywords

Main Subjects

Publisher’s Note Shahid Chamran University of Ahvaz remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. 

[1] Von Den hoff A.E., Tetervin N., Determination of General Relation for The Behavior of Turbulent Boundary layer, Report/Patent: NACA-TR-772, 29, 1943, 381-405.
[2] Waitman B.A. Reneau l.R., Kline S.J., Effect of Inlet Condition on Performance of Two-Dimensional Diffuser, ASME Journal of Basic Engineering, D83, 1961, 349-360.
[3] MOORE C.A., KLINE, S.J., Some Effects of Vanes and of Turbulence in Two-Dimensional, Wide-Angle Subsonic Diffusers, Report TN-4080, NACA, 1958, 93R14383
[4] FOX R.W., KLINE, S.J., Flow Regime Data and Design Method for Curved Subsonic Diffusers, ASME Journal of Basic Engineering, 84, 1962.
[5] Rao D.M., Raju K.N., The use of Splitters for control flow control in wide angle conical diffusers, Bangalor, National Aeronautical Laboratory, TN-AE, 1964, 26-64.
[6] Furuya Y., Sato T., Kushada T., Loss of Flow in the Conical Diffusers with Suction at the Entrance, Bulletin of JSME, 9(33), 1966, 532-556.
[7] Senoo Y., Nishi M., Improvement of the Performance of the Conical Diffusers by Vortex Generators, ASME, 73, 1974, 4-10.
[8] Cochran D. L., Kline S.J., The Use of Short Flat Vanes for Producing Efficient Wide-Angle Two-Dimensional Subsonic Diffusers, NACA-TN 4309, 1985.
[9] He Y., Kobayashi T., Numerical Prediction Of Turbulent Flow In A Conical Diffuser Using K- Model, Acta Mechanica Sinica, 8(2), 1992, 117-126.
[10] Apsley D.D., Leschziner M.A., Advanced Turbulence Modelling of Separated Flow in a Diffuser: Turbulences and Combustion, Kluwer Academic Publishers, Netherlands, 1999.
[11] Singh R.K., Azad R.S., Turbulent flow in a conical diffuser: A review, Experimental Thermal and Fluid Science,13(4), 1995, 318-337.
[12] Brunn A., Nitsche W., Separation control by Periodic excitation in a turbulent axisymmetric diffuser flow, Journal of Turbulence, 4(9), 2003, 1-10.
[13] Charry E.M., Elkins C.J., Eaton J.K., Pressure measurements in a three-dimensional separated diffuser, International Journal of Heat and Fluid Flow, 30(1), 2009, 1-20.
[14] Ohlsson J., Schlatte P., Fischer P.F., Henngson D.S., Direct numerical simulation of separated flow in three-dimensional diffuser, Journal of Fluid Mechanics, 650, 2010, 307-318.
[15] Dehghani M., Entropy generation analysis of nanofluid forced convection in MHD plane diffuser, Numerical Heat Transfer, 75(9), 2019, 647-645.
[16] Askovic R., An approximate method to calculate turbulent boundary layer on an axisymmetric body, Transactions of the Canadian Society for Mechanical Engineering, 18(2), 1994, 111-129.
[17] Askovic R., Practical Approximate Turbulent Boundary Layer Calculation into the Divergent Rectangular Channel, Zeitschrift für Angewandte Mathematik und Mechanik, 1996, 76-6, 321-335.
[18] Mahbubul I.M., Preparation, Characterization, Properties and Application of Nanofluid, Micro and Nano Technologies, William Andrew, 2019.
Journal of Applied and Computational Mechanics
Volume 8, Issue 3
July 2022
Pages 891-903