Nusselt numbers from numerical investigations of turbulent flow in highly eccentric horizontal annuli

Zimmermann, Conrad; Lemcke, Felix J.; Kabelac, Stephan

doi:10.1016/j.icheatmasstransfer.2019.104344

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…Due to the change of radial vaporization flux caused by laser intensity distribution, a certain pressure gradient F was formed on the kerf surface, and the laser energy was reflected by the kerf wall many times before reaching the bottom (Kubovsky and Kacik 2009). In the reflection process, part of the laser energy would be absorbed by the plasma that was generated by ionization in the kerf and the kerf wall, and a certain depth kerf would be formed with the relative motion of the laser beam and the wood workpiece (Arshed et al 2014;Zimmermann et al 2019).…”

Section: Experimental Transmission Process Of Laser Energymentioning

confidence: 99%

Effect of wood microstructure on the quality of gas-assisted laser cutting of cherry

Liu,

Yang,

Ding

2023

BioRes

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To improve the processing quality of wood products, the effects of different wood microstructure on the cutting quality of cherry wood were studied in the experimental process of gas-assisted laser processing. Based on the absorption ability of wood relative to laser wavelength, the composite processing of CO2 laser and inert gas was carried out. Kerf width and surface roughness were used as evaluation indexes, with analysis by factor experiments. The results showed that under the same parameter conditions, due to the difference in internal structure of wood, the cavity structure in the tracheid was more conducive to the diffusion and absorption of laser energy during perpendicular cutting. In addition, the kerf width and surface roughness of parallel cutting were smaller than that of perpendicular cutting. The microscopic morphology and surface carbon content of the kerf surface showed that during perpendicular cutting, due to the plugging effect of small holes, heat accumulation was not conducive to the flow of flue gas and carbide; thus carbon particles remained in the tracheid, and the carbon content of kerf surface was higher.

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Section: Experimental Transmission Process Of Laser Energymentioning

confidence: 99%