Mixing enhancement using a coil insert

The distortion of a round jet by coil inserts of various lengths

“…The present study is a continuation of our previous investigations [8][9][10] where the effects of coil with variable pitch spacing, and constant wire diameter or variable wire diameter and constant pitch spacing on the mixing process of a turbulent jet were investigated. These investigations have shown that maximum mixing enhancement in a turbulent jet can be obtained when the ratios of the coil pitch spacing and coil wire diameter to the tube inside diameter, p=D and d=D respectively, are near 1.0 and 0.1.…”

Review on Recent Progresses in Heat Transfer Enhancement Through the Use of Passive Vortex Generators and Its Applications in Solar Parabolic Trough Systems

“…Rahai [20] carried out similar experiments with air as the working fluid ad explained the effect of various coil spacing on the mixing process. Kumar and Judd [21] further proposed correlations of Nusselt number and friction factor for turbulent0 flow with wire coil inserts.…”

Aerodynamic effectiveness of the flow of exhaust gases in a generic formula one car configuration

“…The mixing between the exhaust flow and the air in the chamber behind the radiator must be maximised. A number of studies on the optimisation of the mixing of turbulent jets by introduction of swirl generators have been performed by Mi and Nathan (2) , Rahai and Wong (3) , Hilgers and Boersma (4) and Rahai et al (5) . The computational study of Reynier and Minh (6) using a 2-equation k-ε model showed that for a high velocity ratio, recirculation from the outer flow towards the centre line of the jet occurs.…”