Local Heat Transfer Coefficients Under an Axisymmetric, Single-Phase Liquid Jet

摘要: The purpose of this investigation was to characterize local heat transfer coefficients for round, single-phase free liquid jets impinging normally against a flat uniform flux surface. problems parameters investigated were jet Reynolds number Re, nozzle-to-plate spacing z, and diameter d. A region near-constant Nusselt observed the bounded by 0 {le} r/d 0.75, where is radical distance from impingement point. profiles exhibited sharp drop > followed an inflection shower decrease thereafter. Increasing generally decreased slightly. characteristics found be dependent on nozzle diameter. This explained influence free-stream velocity gradient transfer, as predicted in classical analysis infinite stagnation flow transfer. Correlations average numbers reveal approximate dependence Re{sup 1,3}.