Enhanced Heat Transfer in a Dual‐Offset Jet Configuration: A Comparative Study With a Single‐Offset Jet Flow

ABSTRACT

The current study compares the heat transfer characteristics of a dual offset jet (DOJ) consisting of two plane isothermal turbulent offset jets and a single offset jet (SOJ). The Reynolds Averaged Navier–Stokes (RANS) equations‐based incompressible flow solver, in addition to the two‐equation turbulence model standard , is utilized to generate the simulation data. In the case of DOJ configuration, the offset ratio (, ratio of the jet centerline–horizontal wall distance to the nozzle width) of the jet on the upper side is varied from 6 to 12; the same for the jet on the lower side is retained at 3. The Reynolds number () at the nozzle outlet for both the jet configurations is varied between 15,000 and 35,000. The bottom plate is heated and set at a constant temperature boundary condition. The analysis of heat transfer results indicates that the DOJ thermal boundary layer remains thicker than that for the SOJ in the developed zone. The local Nusselt number () along the heated bottom wall for the DOJ is found to be superior than the SOJ for a given value of and . Moreover, the average Nusselt number () along the bottom wall is found to be greater for the dual offset jet configuration compared to the single offset jet. A regression analysis which is performed to correlate with , and results in correlation functions for the DOJ and for the SOJ, applicable in the range and .