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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v42.i2.40
pages 131-148

Turbulent Mixing of Subsonic Hot and Cold Air Jets

V. Ilangovan
Department of Mechanical Engineering, Karpaga Vinayaga College of Engineering and Technology Tamilnadu, 603319, India

ABSTRACT

An experimental investigation of mean and turbulent flow fields resulting due to the interaction of subsonic, axisymmetric, hot and cold air jets in coaxial configuration has been reported. The basic characteristics of turbulent jets such as axial spread, radial growth and centre line decay of flow variables were altered remarkably with addition of heat. When the Gaussian shape of the normalized mean velocity distribution across the jet was not significantly affected by the heating, the local values of mean axial velocity were different for different levels of heat addition. The increase in entrainment in the initial region is due to the combined effect of mechanisms such as a large amount of small-scale vorticity, strong acceleration of jet due to density difference and larger radial expansion Based on the experimental data, a correlation was developed to predict the variation in entrainment ratio for different heating levels. The spatial variation of turbulent Prandtl number, a parameter that compares the relative rates of turbulent momentum and turbulent heat transfer, is found to be dependent on temperature ratio.


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