THERMAL MANAGEMENT USING FREE LIQUID JET IMPINGEMENT FROM A SLOT NOZZLE TO A CURVED PLATE

摘要

The conjugate heat transfer behavior of a free liquid jet discharging from a slot nozzle and impinging vertically on a curved cylindrical shaped plate of finite thickness has been examined using a numerical analysis. The simulation model included the entire fluid region (impinging jet and flow spreading out over the convex surface) and solid plate as a conjugate problem. Solution was done for constant heat flux boundary condition at the bottom surface of the plate. Computations were done for jet Reynolds number (Rej) ranging from 500 to 1800, dimensionless nozzle to target spacing ratio (P) from 0.75 to 3, and inner plate radius of curvature to nozzle diameter ratio (R_I/d_n) of 4.16-16.66. Results are presented for dimensionless solid-fluid interface temperature, dimensionless maximum temperature in the solid, and Nusselt number. Numerical simulation results are validated by comparing with experimental measurements. Local and average Nusselt number and heat transfer coefficient distributions showed a strong dependence on the impingement velocity or Reynolds number. As the velocity increases, the Nusselt number increases over the entire solid-fluid interface. Decreasing the nozzle to target spacing ratio favors the increasing of the Nusselt number.