Benchmarking of Gas‐Assisted Atomization Systems for Liquid Disintegration

Günther, Astrid; Lampa, Aljoscha; Fritsching, Udo; Schröder, Jewe; Kleinhans, Agnes; Gaukel, Volker; Schuchmann, Heike P.; Loth, Jan-Martin; Petermann, Marcus; Wirth, Karl‐Ernst

doi:10.1002/ceat.201500331

Cited by 7 publications

(3 citation statements)

References 55 publications

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“…Based on the micrographs, it appears that the CoCrMo, CP-Ti, and Ti64 powders are spherical, whereas the 316L powders are relatively non-spherical. Satellite powders are often attached to the surface of powders with medium particle sizes, particularly the 316L-M and CoCrMo-M groups, which is considered to be a typical feature of powders produced by the atomization process [30,31]. The particle size distribution of all powders is summarized after sieving, and the results are in line with expectations, as shown in Table S2.…”

Section: Surface Morphology Of the Metal Powders And 3d Printed Implantssupporting

confidence: 78%

Impacts of residual 3D printing metal powders on immunological response and bone regeneration: An in vivo study

Tang

Zhuo²,

Zhang³

et al. 2022

Preprint

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Background Residual powder is a defect in powder bed fusion-based additive manufacturing (3D printing), and it is difficult to completely remove it from as-printed materials. In addition, it is not necessary to apply 3D printed implants with residual powder in the clinic. The immunological response triggered by the residual powder is an important area of study in medical research. Methods To further understand the possible immunological reactions and hidden dangers caused by residual powders in vivo, this study compared the immunological reactions and osteolysis caused by typical powders for four implant materials: 316L stainless steel, CoCrMo, CP-Ti, and Ti-6Al-4V (particle size range of 15–45 µm), in a mouse skull model. Furthermore, the possible immunological responses and bone regeneration induced by the four 3D printed implants with residual powder in a rat femur model were compared. Results In the mouse skull model, it was found that the 316L-S, CoCrMo-S, and especially the 316L-M powders, upregulated the expression of pro-inflammatory factors, increased the ratio of RANKL/OPG, and activated more functional osteoclasts, resulting in more severe bone resorption compared with those in other groups. In the rat femur model, which is more suitable for clinical practice, there is no bone absorption in implants with residual powders, but they show good bone regeneration and integration ability because of their original roughness. The results indicate that the expressions of inflammatory cytokines in all experimental groups were the same as those in the control group, showing good biological safety. Conclusions The results answered some critical questions related to additively manufactured medical materials in vivo and indicated that as-printed implants may have great potential in future clinical applications.

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Section: Surface Morphology Of the Metal Powders And 3d Printed Implantssupporting

confidence: 78%

Impacts of residual 3D printing metal powders on immunological response and bone regeneration: An in vivo study

Tang

Zhuo²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…The following four different supercritical gas‐assisted atomizer systems were investigated by Gunther et al, and they further compared the atomization performance for water and polymer solution feeds: external mixing, effervescent atomization, superheated atomization, and CO 2 ‐assisted atomization. An external mixing twin‐fluid atomizer was used as standard atomization configuration and is compared with three rather unusual atomization techniques.…”

Section: Supercritical Fluid–assisted Atomizationmentioning

confidence: 99%

Fuel atomization in gas turbines: A review of novel technology

et al. 2019

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Summary The atomization of fuel is crucial in the combustion and emission of a gas turbine, and the fuel atomization is continuous without any cycles or strokes. However, to achieve a desired amount of combustion during this continuous process, fuel must be added and mixed with the high‐pressure air exiting the compressor in proper proportions. To make the engine as small and lightweight as possible is a constraint and requires the fuel injection, mixing, and combustion to occur within the smallest volume possible. In most cases, this is inefficient and less practicable. A major drawback is the requirement of high injection pressure with relatively small increase in flow rate. In recent years, research was conducted to improve fuel atomization in a gas turbine by using different novel approaches that were simpler, more adaptable, and efficient to enhance the atomization. However, most of these studies were in isolation without any comprehensive literature on recent trends. Therefore, this review attempts to give an insight on recent development of fuel atomization in a gas turbine. Particular emphasis was given to air‐, plasma‐, ultrasound‐, and supercritical fluid–assisted atomization techniques.

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“…Parçacık boyunun kiriş çapı ve kılcal dalga boyu ile doğrudan ilişkili olduğunu göstermişlerdir. Günther vd [6]. yaptıkları çalışmalarında gaz-destekli atomizasyon sistemlerinde sıvı parçalanması olayını dört farklı atomizör kullanarak araştırmışlar ve 3 farklı sıvının spray morfolosini incelemişlerdir.…”

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Gaz Atomizasyonu İle Metal Tozu Üretiminde Toz Boyutunun Sayısal Çözümleme İle Belirlenmesi

Kayalı

Ünal

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Two-phase modeling of gas atomization process  Demonstration of gas atomization mechanisms by numerical solution  Determination of particle size by numerical solution Figure A. Modeling of two-phase flow and particle formation during gas atomization Purpose: The main purpose of this research is to investigate the median particle size and particle size distribution of metal powders produced during gas atomization. Theory and Methods: Gas atomization process is based on the disintegration of molten metal to produce metal powders. The disintegration phenomenon is a very complex one to fully understand, and currently, there are no satisfying CFD (Computational Fluid Dynamics) solutions to verify some proposed models. However, that phenomenon has a great impact on the final product and it identifies the characteristics of metal powders. There are a few studies which used different approaches to estimate the particle size and distribution of gas atomization by using CFD solutions with one of the preexisting two-phase models. In this study, interaction of the liquid metal and atomizing gas has investigated via Volume of Fluids (VOF) method of ANSYS/Fluent. This method with a new approach has used to determine the particle sizes and to reveal the atomizing mechanism and characteristics of the gas atomization process. Results: Two-phase flow of gas atomization under 2.5 MPa pressure has successfully simulated. At the result of particle visualization, median particle size has calculated to be 49.8 µm and the particle size distribution has shown to have a log-normal characteristic. Conclusion: In this study, the instantaneous flow dynamics and particle formation of gas atomization has obtained by a new approach. Volume of Fluids method with this new approach has shown good results in terms of predicting flow dynamics, atomizing mechanism, particle size and distribution for gas atomization.

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Benchmarking of Gas‐Assisted Atomization Systems for Liquid Disintegration

Cited by 7 publications

References 55 publications

Impacts of residual 3D printing metal powders on immunological response and bone regeneration: An in vivo study

Impacts of residual 3D printing metal powders on immunological response and bone regeneration: An in vivo study

Fuel atomization in gas turbines: A review of novel technology

Gaz Atomizasyonu İle Metal Tozu Üretiminde Toz Boyutunun Sayısal Çözümleme İle Belirlenmesi

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