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Journal of Flow Visualization and Image Processing

Publicado 4 números por año

ISSN Imprimir: 1065-3090

ISSN En Línea: 1940-4336

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00013 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

Indexed in

LINEAR STABILITY ANALYSIS OF NAPPE OSCILLATIONS

Volumen 29, Edición 4, 2022, pp. 43-62
DOI: 10.1615/JFlowVisImageProc.2022041019
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SINOPSIS

The falling liquid curtain at a low-head condition subjected to an air cushion on one side develops longitudinal oscillations. These oscillations can generate considerable sound energy that can induce vibrations in the nearby structures. Thus, stability analysis and flow visualization of these liquid sheets is vital for safeguarding the structures housing them. In the present study, global behavior of gravitational inviscid liquid sheet subjected to an adjacent compressible air cushion is analyzed. The linear stability analysis is carried out by formulating the eigenvalue problem. Moreover, the effect of Froude number, domain size, and nozzle width on the oscillations is investigated. It is demonstrated that an increase in the inertia forces and nozzle width destabilize the liquid sheet. However, an increase in air cushion size stabilizes the liquid sheet oscillations. Moreover, global eigenmodes for pressure and sheet deflection are compared. It is depicted that the growth of perturbations occur until the pressure oscillations are in phase with the liquid sheet oscillations, whereas amplitude dampening occurs when both are out of phase. In addition, numerical simulation has been performed, taking into consideration viscosity and surface tension forces, to visualize the temporal behavior of the gravitational liquid nappe. It is depicted that due to confinement, the pressure builds up near the wall, causing the sheet to deflect away from it.

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