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Flow field topology of impinging jets with fractal inserts

Cafiero, Gioacchino, Discetti, S. and Astarita, T. (2016) Flow field topology of impinging jets with fractal inserts In: iTi Conference on Turbulence 2014 - Progress in Turbulence VI, Bertinoro, Italy.

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An experimental investigation of the flow field features of a round air jet equipped with a fractal (FG) and a regular (RG) grid insert impinging on a flat surface is carried out by means of 2D-2C Particle Image Velocimetry (PIV). The results are compared to those for a round jet without any grid (JWT). The test Reynolds number is set to 10, 000. The average flow fields and the turbulent kinetic energy distributions are presented. In particular, the effect of the presence of the fractal grid on the turbulence intensity distribution and on the planar component of the Reynolds stress is analyzed. Some differences between the location of the maximum of the turbulence intensity profile and the data reported in the literature are found. A possible interaction process between the wakes of the grids and the growing shear layer of the jet might be responsible of this discrepancy. A comparison between the flow field and the heat transfer results obtained by the authors in a previous work is also carried out. What is underlined is that both an higher turbulence level and a much stronger axial velocity cause an increment in the heat transfer rate.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Discetti, S.
Astarita, T.
Date : 3 March 2016
DOI : 10.1007/978-3-319-29130-7_42
Uncontrolled Keywords : Flow fields; Fractals; Heat transfer; Kinetic energy; Kinetics; Reynolds number; Turbulent flow; Velocity measurement; Experimental investigations; Flow field feature; Heat transfer rate; Interaction process; Particle image velocimetries; Turbulence intensity; Turbulence intensity profiles; Turbulent kinetic energy distribution; Turbulence
Related URLs :
Additional Information : Part of the Springer Proceedings in Physics book series (SPPHY, volume 165)
Depositing User : Clive Harris
Date Deposited : 12 May 2020 18:59
Last Modified : 12 May 2020 18:59

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