Abstract
Hydrodynamic characteristics of an axiaymmetric laminar jet impingement with annular confinement are numerically investigated. With increaaing nozzle tube length or decreasing nozzle Reynolds number, the velocity distribution at the nozzle exit approaches the fully developed profile. The effect of jet separation distance on this velocity distribution is insignificant for S ≥ 1, whereas a significant influence can be found for S = 0.5. In addition, the boundary-layer thickness at the stagnation point decreases when either the nozzle Reynolds number or nozzle tube length increases. On the other hand, the thickness increases with increaaing jet separation distance. Furthermore, two relationships between the maximum skin-friction factor and the nozzle Reynolds number for parabolic and uniform velocity profiles are proposed, respectively. Finally, the maximum skin-friction factor will gradually deviate away from the valun of parabolic velocity profile when either the nozzle tube length decreases or Reynolds number increases.
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