Suscripción a Biblioteca: Guest
Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

DIRECT NUMERICAL SIMULATIONS OF COAXIAL JETS MIXING PROPERTIES

pages 1231-1236
DOI: 10.1615/TSFP4.2050
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SINOPSIS

Direct Numerical Simulations (DNS) are performed to study the mixing process in round coaxial jets. The mixing of the two fluids issued from the inner and annular streams is analysed by means of flow visualization and statistics of the mixing fraction field. It is shown that the annular ring structure has no influence on the mixing activity, when the annular stream and co-flow medium are seeded by the same chemical species. Nevertheless, a set of pure unmixed spots are observed, even in the far field, as the annular jet and the co-flow are seeded by two different species A and B. Analysis of the PDF and skewness of the scalar indicates that turbulent mixing process in the round co-axial jets acts intermittently through a radial periodic pulsation of the ring structures. The high level of the scalar dissipation has been observed to occur at the boundaries of the large turbulent structures.

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