Does Cavitation Affect Droplet Breakup in High‐Pressure Homogenization? Insights into Local Effects

Preiss, Felix Johannes; Hetz, Maximilian; Karbstein, Heike P.

doi:10.1002/cite.202100104

Cited by 15 publications

(2 citation statements)

References 44 publications

(44 reference statements)

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“…Additionally, the filter for removing objects with an area of less than 200 pixels was increased to 500 pixels as well. Under operation conditions where elongation ratios are greater than 10, droplets are spotted by criteria like porosity and circularity, as described in detail by Preiss et al [ 22 ] Droplets in the backflow area around the jet often appeared noisy, therefore objects with a porosity greater than 0.1 (0 = not porous) were eliminated. Droplets with higher elongation ratios were heavily lengthened, hence setting the cutoff for circularity to 0.7 was sufficient.…”

Section: Methodsmentioning

confidence: 99%

Influence of the droplet trajectory on the resulting droplet deformation and droplet size distribution in high‐pressure homogenizer orifices

et al. 2022

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High‐pressure homogenization is a commonly used process to produce emulsions with a droplet size of less than 1 μm. During the process, a pre‐emulsion is pumped with a pressure of several mega Pascal through a disruption unit, where the droplets are deformed and subsequently broken up in the turbulent area of the disruption unit. The scope of this investigation is to determine the influence of the droplet trajectory on the droplet size distribution of emulsions of different viscosity ratios or interfacial tension. Measurements of the droplet deformation prior to the droplet breakup using image‐processing tools complemented the observations. In addition, computational fluid dynamics simulations were performed to determine the stress history on the droplet trajectories. It was found that droplets on a trajectory close to the wall are more deformed when leaving the disruption unit compared to droplets on the centreline. The deformation of droplets at the edge of the jet increases downstream the disruption unit until it is finally disrupted. The simulation results support the experimental data, as it can be shown that shear and strain stresses on the trajectories close to the wall significantly exceed the stresses on the trajectories on the centreline. For an emulsion with a viscosity ratio greater than 3, droplets on a trajectory close to the wall resulted in smaller droplets and narrower droplet size distribution, while no significant influence was found for smaller viscosity ratios. Lowering the interfacial tension results in a stronger deformation, which was more pronounced for lower viscosity ratios (λ ≈ 3).

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Section: Methodsmentioning

confidence: 99%

Influence of the droplet trajectory on the resulting droplet deformation and droplet size distribution in high‐pressure homogenizer orifices

et al. 2022

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“…The principle of high-pressure homogenization is the instantaneous formation of turbulence, shear stress and cavitation (Preiss, Hetz, and Karbstein 2022). The highpressure homogenizer pushes the liquid under high pressure (from 100 to 2000 bar) through narrow gaps at the micron level, thus creating acceleration over short distances (Catherine Charcosset, El-Harati, and Fessi 2005).…”

Section: High Pressure Homogenizersmentioning

confidence: 99%

Ultrasound-Assisted Novel Double Emulsion Containing Grape Pomace Polyphenols as a Delivery System to Encapsulate Vitamin E and Omega-3 for Food and Dietary Supplement Applications

Zhang¹

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Grape pomace (GP) is a by-product of food industry production rich in polyphenols which is beneficial to the human body. An electrochemical (EC) method was used to remove the bitterness and astringency of tannins in grape pomace extract. An optimized current 0.15A and 1.5 g/L NaCl concentration were chosen to remove tannins. The TTC (total tannin content) decreased by 83% after the electrochemical treatment. A novel food grade O/W/O double emulsion delivery system was designed with TFE (tannins-free extracts) and 1% psyllium husk using low-frequency ultrasound (20kHz). Ultrasound improved the emulsion stability and reduced the single emulsion droplet size which confirmed by microscope. TFE was added to the emulsion to delay lipid oxidation which was confirmed by ORAC test. The feasibility of optimized TFE double emulsion delivery system was investigated by encapsulating vitamin E (α -tocopherol) and omega-3 fatty acids. The double emulsion was stable up to 30 days.First, I would like to give my deepest thanks to my supervisor Dr. Farah Hosseinian for her continuous encouragement and support over the past two years. Whenever I had difficulties with my project, Farah was always able to help me find solutions with her abundant research knowledge. As an international student, Farah treated me with such warmth and care that I feel like a family in our group.Furthermore, I am grateful to all of my new friends I met in Carleton. Thanks to Minfang Luo for helping me become familiar with our lab and school, I am so grateful that she always helped me whether in the lab or in daily life. Thanks to Winifred Akoetey, who is so knowledgeable and taught me to operate several lab equipment. When I encountered difficulties, she was always willing to collaborate with me to find solutions. I would also like to thank all my friends in our office. Thanks to Gabriela Campos Espinosa, Harthika Mylvaganam, Chien Nguyen, Ramak Esfandi and Barakat Azeez, your companionship during my campus life has made me heartwarming and happy.Thanks to Dr. Jianqun Wang for his help with the scanning electron microscope. Thanks to Kyle Fournier for his help with the FTIR operation.Additionally, I would like to thank my friend in China, Chuanyu Yang. When I complained to her about my troubles in life and lab work, she would always support and encourage me.Lastly, I would like to express my deepest gratitude to my family. Thanks to my parents, Yanling Shen and Dawei Zhang, for supporting me in every decision I made and sponsoring me to study abroad. To my husband, Quan Shao, thank him for accompanying me to Canada and always being there for me when I was in need. v

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High-pressure homogenizer valve design modifications allowing intensified drop breakup without increasing power consumption. I. Optimization of current design-principle

Håkansson

2024

Chemical Engineering and Processing - Process Intensification

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Does Cavitation Affect Droplet Breakup in High‐Pressure Homogenization? Insights into Local Effects

Cited by 15 publications

References 44 publications

Influence of the droplet trajectory on the resulting droplet deformation and droplet size distribution in high‐pressure homogenizer orifices

Influence of the droplet trajectory on the resulting droplet deformation and droplet size distribution in high‐pressure homogenizer orifices

Ultrasound-Assisted Novel Double Emulsion Containing Grape Pomace Polyphenols as a Delivery System to Encapsulate Vitamin E and Omega-3 for Food and Dietary Supplement Applications

High-pressure homogenizer valve design modifications allowing intensified drop breakup without increasing power consumption. I. Optimization of current design-principle

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