Mechanics & Industry
Volume 19, Number 1, 2018
|Number of page(s)||15|
|Published online||31 August 2018|
Numerical and experimental study of a jet impinging with axial symmetry with a set of heat exchanger tubes
Department of Mechanical Engineering, Germi Branch, Islamic Azad University,
2 Department of Renewable Energies, Faculty of New Science & Technologies, University of Tehran, Tehran, Iran
3 Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
4 Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
Accepted: 16 March 2017
The main purpose of this research is to predict the flow field of impinging turbulent jet with cylinder in a 3-d state. Nowadays, shear stress has multiple uses in the industry. The study has been conducted in both compressible and incompressible states with output velocities between 100 and 150 m/s, in different eccentricities of jet with respect to the first cylinder, and in various nozzle outlet orifice distances from front edge of the first cylinder. Pressure distribution and shear stress on cylinder surfaces have been determined and efficiency of jet in cleaning the heat exchangers pipes has been analyzed. Also, an experimental investigation has been conducted in order to verify the accuracy of the numerical results. Results show that if the distance between nozzle outlet orifice and the front edge of the first cylinder (L) equals 1.52 D (D is the diameter of the cylinder), the jet has the highest cleaning effect.
Key words: Impinging turbulent jet / compressible 3D flow / hydrodynamic analysis / cylinder / turbulence model
© AFM, EDP Sciences 2018
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