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Development of Attached Cavitation at Very Low Reynolds Numbers from Partial to Super-Cavitation

التفاصيل البيبلوغرافية
العنوان: Development of Attached Cavitation at Very Low Reynolds Numbers from Partial to Super-Cavitation
المؤلفون: Florent Ravelet, Amélie Danlos, Farid Bakir, Kilian Croci, Sofiane Khelladi, Christophe Sarraf
المصدر: Applied Sciences, Vol 10, Iss 20, p 7350 (2020)
بيانات النشر: MDPI AG, 2020.
سنة النشر: 2020
المجموعة: LCC:Technology
LCC:Engineering (General). Civil engineering (General)
LCC:Biology (General)
LCC:Physics
LCC:Chemistry
مصطلحات موضوعية: partial cavitation, super-cavitation, laminar cavitation, cavitation instabilities, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
الوصف: The present study focuses on the inception, the growth, and the potential unsteady dynamics of attached vapor cavities into laminar separation bubbles. A viscous silicon oil has been used in a Venturi geometry to explore the flow for Reynolds numbers ranging from Re=800 to Re=2000. Special care has been taken to extract the maximum amount of dissolved air. At the lowest Reynolds numbers the cavities are steady and grow regularly with decreasing ambient pressure. A transition takes place between Re=1200 and Re=1400 for which different dynamical regimes are identified: a steady regime for tiny cavities, a periodical regime of attached cavity shrinking characterized by a very small Strouhal number for cavities of intermediate sizes, the bursting of aperiodical cavitational vortices which further lower the pressure, and finally steady super-cavitating sheets observed at the lowest of pressures. The growth of the cavity with the decrease of the cavitation number also becomes steeper. This scenario is then well established and similar for Reynolds numbers between Re=1400 and Re=2000.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2076-3417
Relation: https://www.mdpi.com/2076-3417/10/20/7350; https://doaj.org/toc/2076-3417
DOI: 10.3390/app10207350
URL الوصول: https://doaj.org/article/f952b617c2194e7189a8ba38fd6a98a5
رقم الأكسشن: edsdoj.f952b617c2194e7189a8ba38fd6a98a5
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:20763417
DOI:10.3390/app10207350