Abstract
The thermal characteristic study of a dual jets comprising of combined wall jet and offset jet, with different bottom wall boundary conditions (i.e.; adiabatic, constant wall heat flux) is formulated. The flow is two-dimensional, steady, incompressible, and turbulent at high Reynolds number with negligible body forces. Initially the code developed for single off set jet with bottom wall adiabatic and constant heat flux boundary condition of different offset ratios. The simulated results are validated with the benchmark results, and the simulated results are found in good agreement with the experimental results. Dual jets case is also studied with adiabatic bottom wall, temperature distribution in the heated jets and the temperature decay in the normal direction due the entrainment characteristics are observed. For constant heat flux case, variation of local Nusselt number with the separation ratio is observed.
Highlights
A jet is a stream of fluid exiting a conduit at an open end and travelling in nearly constant direction for a considerable distance, compared to the conduit-diameter
The shearing encountered by the jet fluid as it traverses across the surrounding fluid gives the jet its mixing characteristics
The extensive use of turbulent jets as agents of enhanced fluid mixing is largely due to high heat and mass transfer rates achieved by generation of free turbulence at boundary between jet fluid and ambient fluid
Summary
A jet is a stream of fluid exiting a conduit at an open end and travelling in nearly constant direction for a considerable distance, compared to the conduit-diameter. Kim et al [5] provided the detailed experimental study on flow characteristics such as reattachment phenomena, mean velocity and turbulence intensity profiles, and the effects of the Reynolds number and off set ratio on the heat transfer from a uniformly heated plate to the wall attaching offset jet has studied. They found that maximum Nusselt number point coincides with the time averaged re-attachment point and Nusselt number decreases monotonically in the re-development region after the jet re-attachment. The computed results have been compared and found to be in good agreement with the experimental results
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