Convective heat transfer from an isothermal hot cylindrical cavity due to a
turbulent round jet impingement is investigated numerically.
Three-dimensional turbulent flow is considered in this work. The Reynolds
stress second order turbulence model with wall standard treatment is used for
the turbulence predictions the problem parameters are the jet exit Reynolds
number, ranging from 2x104 to 105and the normalized impinging distance to the
cavity bottom and the jet exit Lf, ranging from 4 to 35. The computed flow
patterns and isotherms for various combinations of these parameters are
analyzed in order to understand the effect of the cavity confinement on the
heat transfer phenomena. The flow in the cavity is divided into three parts,
the area of free jet, and the area of the jet interaction with the reverse
flow and the semi-quiescent flow in the region of the cavity bottom. The
distribution of the local and mean Nusselt numbers along the cavity walls for
above combinations of the flow parameters are detailed. Results are compared
against to corresponding cases for impinging jet on a plate for the case of
the bottom wall. The analysis reveals that the average Nusselt number
increases considerably with the jet exit Reynolds number. Finally, it was
found that the average Nusselt number at the stagnation point could be
correlated by a relationship in the form Nu=f(Lf,Re).
The turbulent heat transfer by a confined jet flowing inside a hot cylindrical cavity is investigated numerically in this paper. This configuration is found in several engineering applications such as air conditioning and the ventilation of mines, deadlock, or corridors. The parameters investigated in this work are the Reynolds number (Re, 20,000 < Re <50,000) and the normalized distance Lf between jet exit and the cavity bottom (Lf , 2
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