Instantaneous and Planar Visualization of Supersonic Gas Jets and Sprays

Kim, T. K.; Son, S. Y.; Kihm, Kenneth D.

doi:10.1615/jflowvisimageproc.v5.i2.10

Cited by 4 publications

(2 citation statements)

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“…However, the converging diverging nozzle under the same stagnation pressure develops an overexpanded supersonic jet and the oblique shocks, followed by the expansion fans, are established at the nozzle exit. 9 For that reason, the new designed nozzle has a converging diverging design in order to get supersonic gas velocity of Ma53?3 and is a concentrically slotted type (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Investigation on metal powder production efficiency of new convergent divergent nozzle in close coupled gas atomisation

Ünal¹

2007

Powder Metallurgy

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In the present study, a new designed close coupled annular slit type nozzle is discussed for the most efficient powder production and the availability of the finest particle size. Pure tin powder was produced by using nitrogen gas at the Dumlupinar gas atomisation unit. It was found that the finest particle size with the highest efficiency was obtained at the atomising pressure where the maximum aspiration pressure is formed. Above a certain gas/melt flow ratio, the resultant particle sizes cannot be considerably reduced by further increasing atomising pressure. At that point, the applied nozzle system reaches a capacity limit, which also marks the point of the most economic work for the production of fine powders with that system. The main achievement of the nozzle discussed in the present study is that the most efficient powder production is accomplished at relatively low atomising gas pressures.

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Section: Methodsmentioning

confidence: 99%

Investigation on metal powder production efficiency of new convergent divergent nozzle in close coupled gas atomisation

Ünal¹

2007

Powder Metallurgy

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“…Recently, Buchmann et al [24] have also studied particle-laden underexpanded gas jets and measured particle velocities employing a novel measurement technique. Kihm et al [25,26] and Park et al [27] have studied spray formed by airblast atomizers and investigated the effect of under-expanded jets formed by airblast gas on droplet breakup. Hence, based on the observation in these studies, it can be assumed that the under-expanded gas jet behavior is also exhibited in particle-laden and droplet-laden gas jets or sprays investigated in the present study.…”

Section: Under-expanded Jetsmentioning

confidence: 99%

Experimental studies on structure of airblast spray in crossflow

Sinha

Ravikrishna

2019

Sādhanā

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The present investigation is focused on experimental studies on the structure of airblast spray in crossflow. Atomizer is at a higher pressure than ambient and the airblast gas is expected to exhibit features generally found in under-expanded gas jets. High-speed images are captured using shadowgraphy technique. Certain wave-like structures observed in the near-nozzle region are attributed to shock-vortex interactions, generally observed in under-expanded gas jets. Proper Orthogonal Decomposition (POD) analysis has been carried out using these images. POD mode shapes clearly show signatures of shock-vortex oscillations and frequencies close to the screeching frequency observed in under-expanded jets. The POD modes are compared for different conditions and the significance of dynamic structures and their temporal behavior is discussed. Finally, a regime map is also proposed to characterize spray behavior in crossflow.

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