Further results on the mean mass transfer and fluid flow in a turbulent round jet

Angelino, Matteo; Venuta, Ivan Di; Boghi, Andrea; Petracci, Ivano; Gori, Fabio

doi:10.1016/j.icheatmasstransfer.2022.106568

Cited by 4 publications

(2 citation statements)

References 57 publications

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“…Similar to the submerged free jet which was identified to have 3 distinct regions of flow: the undisturbed region of flow, the potential core region and the fully developed region [45][46][47], the cavitation jet also has 3 regions: the growing region, the shedding region, and the collapsing and diffusing region [48]. The damage to the target is mainly caused by the last region.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 93%

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

Huang,

2024

Applied Sciences

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Submerged cavitating jets can effectively remove marine organisms from ship hulls without damaging the surface paint. To enhance the cleaning efficiency of cavitating jets, the selection of an appropriate nozzle structure and the design of an efficient cleaning device are crucial. In this study, the submerged cavitation effect of different nozzles was analyzed by numerical simulation. The actual cleaning efficacy of the nozzles was confirmed through erosion experiments as well. The simulation and experiment showed that the shear nozzle, absent of a pre-shrinking section and featuring a spherical outlet connected to a diffusion cylindrical section, maintained stable erosion performance at a standoff distance of 30–50 mm. This erosion was primarily attributed to denudation caused by bubble collapse. Based on this shear nozzle, a self-rotating cleaning device was designed and manufactured. A test rig was also established to test the cleaning effect and some parameters of the cleaning device.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 93%

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

Huang,

2024

Applied Sciences

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“…On the other hand, heat of reaction is compressed as it shrank significantly and moved upstream in the case of critical k IRD = 0.9 W/(m • K). Since appropriate jet modeling may play an important role in reactive flows, same as it plays in the heat and mass transfer of non-reactive ones, it should be investigated more closely in future works, especially if some kind of a deflector is involved [38][39][40][41][42][43]. The majority of chemical reactions occur in transitional or fully developed regions, as in the potential core region the self-ignition temperature is not reached in this work due to the absence of substrates pre-heating.…”

Section: Impact Of the Ird On Combustion And Emissionsmentioning

confidence: 99%

Heat Transfer Analysis for Combustion under Low-Gradient Conditions in a Small-Scale Industrial Energy Systems

Tokarski,

Buczyński

2023

Energies

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The issue of maintaining low-gradient combustion in the conditions of high heat extraction has been investigated numerically in this work. The analyses include the application of a convective boundary condition at the wall (with estimated boiling heat transfer coefficient); analysis of the Internal Recirculation Device’s impact on combustion products and heat transfer under low-gradient conditions; and comparison of both traditional and low-gradient combustion modes. It was shown that the Internal Recirculation Device material and geometry has a significant impact on the nitrogen oxide (NOx) formation mechanism, as NO2 emission becomes predominant and can rise up to several hundreds ppm. What is more, along with decrease in thermal resistance of the IRD, CO emissions also increase rapidly, even achieving over 2000 ppm. Additionally, the convective heat transfer rate decreased by about 25% after switching from traditional to low-gradient combustion, whereas the radiative mechanism increased by ≈40% compared to traditional mode. It should also be mentioned that the low-gradient combustion applied in this work achieved approximately 10% higher efficiency than conventional combustion.

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Heat transfer on a flat wall due to a rectangular turbulent jet

Venuta

Boghi²,

Petracci

et al. 2023

International Communications in Heat and Mass Transfer

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Further results on the mean mass transfer and fluid flow in a turbulent round jet

Cited by 4 publications

References 57 publications

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

Heat Transfer Analysis for Combustion under Low-Gradient Conditions in a Small-Scale Industrial Energy Systems

Heat transfer on a flat wall due to a rectangular turbulent jet

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