Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (2nd Report, LDV Measurement of Liquid Velocity in a Nozzle)

Sou, Akira; Tomiyama, Akio; Hosokawa, Shigeo; Nigorikawa, Shinji; Maeda, Tatsutoshi

doi:10.1299/kikaib.72.521

Cited by 1 publication

(1 citation statement)

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“…Regarding the effects of flow passage and injected liquid properties, Figure presents a comparison among the Reynolds number values corresponding to the inception of cavitation according to some previous studies (Sou et al, ,, Nurick, Park et al, and Suh et al , ) together with the results from the developed model. These studies were selected as the nozzle geometries are characterized by a regular rectangular cross section with a sharp entrance edge.…”

Section: Resultsmentioning

confidence: 99%

Prediction of the Impact of Nozzle Geometry on Spray Characteristics

et al. 2021

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In the present paper, the formation and development of cavitation inside the nozzle of an atomizer with different geometrical characteristics have been studied numerically. Different shapes of inlet nozzles and different nozzle-length-to-diameter ratios have been investigated. The developed model has been built as a three-dimensional (3D) one, where the turbulence is modeled considering large eddy simulation. The obtained computational results showed good agreement with the reported experimental results. It has been found that the occurrence of cavitation depends on the amount of energy needed to overcome the viscosity and friction between the liquid layers. The mass flowing through the nozzle decreases with increasing cavitation. The intensity of cavitation depends on the nozzle entrance shape. Sharp edges cause cavitation to occur early in the nozzle, followed by an inclined shape, and then the curved entrance. The dissipative energy in the cavitation and bubble collapse result in an increase in the turbulent kinetic energy of the issuing liquid. This causes more liquid disintegration, leading to larger spray volume and smaller droplet size. The obtained results for spray droplet size distribution have been compared with experimental data developed by other researchers, and a good agreement has also been found.

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