Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7054197 | International Journal of Heat and Mass Transfer | 2018 | 16 Pages |
Abstract
In the present study, swirling coaxial confined impinging turbulent air jets issuing from a novel designed nozzle is studied experimentally. Heat transfer characteristics and pressure distribution on the impingement plate are analyzed. Experiments have been conducted at different dimensionless nozzle-to-plate distances (H/Dâ¯=â¯0.5, 1.0, 1.5, 2.0 and 2.5) and dimensionless flow rates (Qââ¯=â¯0.25, 0.50 and 0.75) for a constant total flowrate of 1.33â¯Ãâ¯10â3â¯m3â¯sâ1 (80â¯L/min). The results show that the flowrate ratio improves the uniformity of the heat transfer through the impingement surface and increases the average Nusselt number. Also, the intensity of convective heat transfer is shown to enhance significantly with decreasing nozzle-to-plate distance. With regards to the pressure distribution, subatmospheric regions occur on the impingement plate. Contribution of swirl is also compared against the pure circular impingement jet condition (Qââ¯=â¯0.0).
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Burak Markal,