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Laminar to turbulent transition in pipe flow through puffs and slugs. Detailed experimental investigations of transitions in low and high Reynolds number pipe flows

Автор:   Mina N.
мягкая обложка
132 страниц
2009 год
Издательство:   Книга по Требованию
3212 руб
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Описание:Transition in pipe flow was first studied in detail by Reynolds (1883) and continued subsequently by numerous researchers. Also considered is a transformation from puffs to slugs through puff splittings, occurring while they propagate in a pipe or by an increase in Reynolds number. As is well known, two distinct types of flow structure exist during a laminar to turbulent transition in pipes, namely puffs and slugs, termed by Wygnanski (1973). Investigations described in this dissertation were concentrated in the development of puffs and slugs in a pipe at different Reynolds numbers, following some preliminary research works. The time between when puffs were created and dissipated was termed ' full- lifetime' and measured directly by a pressure transient. According to the investigations, possible evolutions of puffs were found and discussed. A classical problem in fluid mechanics, laminar to turbulent transition in pipe flow, was investigated. Nevertheless, there are still number of unknown issues that need clarification. In low Reynolds number pipe flows, a dissipation of puffs was observed and then investigated.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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Oil of Russia

The refinery had a large cooperБЂ™s shop, metal shop, and blacksmithБЂ™s shop. In addition, the Baku Oil Company had a cooperБЂ™s plant near Baku itself. An important phase in the companyБЂ™s development took place at this very same refinery, with the organization of lubricant production. This development was primarily due to the work of mining engineer Aleksey Doroshenko, the manager of the Surakhany Refinery. The refinery installed a process line for making lubricants from residual oil, which had previously been regarded as waste and was usually simply burned. The production process for making lubricants at Surakhany Refinery consisted of the following: residual oil was heated to 572б°F, after which superheated steam was passed through it, entraining the oil fractions in flow through a metal pipe into a condenser, where they separated from the water. Later, mining engineer Semц«n Kvitka remarked: БЂњGenerally speaking, while the oil industry is forever indebted to R. I. Ragozin for organizing the production of lubricants, Aleksey Semц«novich Doroshenko earned his share of respect and gratitude from Baku residents for organizing the business in Baku.БЂ«36 The expansion of oil production and increases in petroleum product refining volumes required BOC management to continually take steps to further improve production, develop infrastructure, and introduce modern equipment and new process solutions ...»

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