Three-dimensional numerical study of jet-in-crossflow characteristics at low Reynolds number |
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Authors: | Email author" target="_blank">Arun?K?SahaEmail author Chinni?Babu?Yaragani |
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Institution: | (1) Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208 016, UP, India |
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Abstract: | A numerical study of a square jet in a cross flow is carried out at a Reynolds number of 100. The flow field and heat transfer
characteristic downstream of the jet have been explored by solving three-dimensional unsteady Navier–Stokes equations and
energy equation using higher order spatial and temporal discretization. The projection of vortical structure on a plane is
seen to give the component of vortex normal to the plane. Four combinations of velocity profile namely (1) uniform crossflow
and uniform jet, (2) laminar boundary layer crossflow and uniform jet, (3) uniform crossflow and parabolic jet profile, and
(4) laminar boundary layer crossflow and parabolic jet are compared at same phase to see their effect on the flow field and
heat transfer characteristic. All the four cases are seen to exhibit unsteadiness but the jet with parabolic profile is seen
to show stronger unsteadiness. The instantaneous vortical structures of all the cases at the same phase show that the structures
are more complex for the jet with parabolic velocity profile. The temperature field is seen to be correlated with the vortical
structures. Comparison of the time averaged flow field reveals that the jet penetration is the highest for the jet having
parabolic profile and boundary layer crossflow. The adiabatic effectiveness is observed to be more for the jet with uniform
velocity profile and uniform crossflow and was least for the jet with parabolic velocity profile and boundary layer crossflow. |
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