Study of disturbance wave development in downwards annular flows with a moving frame-of-reference brightness-based laser-induced fluorescence method

Jae Sik An, Andrey V. Cherdantsev, Ivan Zadrazil, Christos N. Markides

Результат исследования: Научные публикации в периодических изданияхстатья

Аннотация

A novel moving frame-of-reference brightness-based laser-induced fluorescence (MFoR-BBLIF) method was developed and demonstrated in downwards co-current air–water annular flows. The method was applied to study the downstream development of individual disturbance waves in flows over a range of conditions (ReL = 276–1321, ReG = 39,500–79,000). In this method, the optical measurement system, and hence, the region of interrogation (ROI) was translated physically along the length of the test-section with a velocity close to that of individual disturbance waves to obtain the velocities of individual disturbance-waves as a function of downstream distance from the inlet. It was found that the velocities of individual disturbance waves increase with both downstream distance and gas–liquid flow conditions. In addition, the variation in the wave velocities was more significant at higher gas and liquid Reynolds numbers. The approach can be integrated with many other contactless measurement methods, and can also be used over a range of translation speeds (not necessarily in a “Lagrangian” manner) to study the evolution of important advecting flow phenomena. Graphic abstract: [Figure not available: see fulltext.].

Язык оригиналаанглийский
Номер статьи169
Число страниц6
ЖурналExperiments in Fluids
Том61
Номер выпуска7
DOI
СостояниеОпубликовано - 1 июл 2020

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