Studies on three-dimensional viscous jets.

Sforza, Pasquale M.; Steiger, Martin H.; Trentacoste, N.

doi:10.2514/3.3549

Cited by 219 publications

(56 citation statements)

References 10 publications

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“…Enhancement of this regular breakdown process by passive means, which is the subject of this paper, has also been studied using noncircular jets. For example, the elliptical cross-section, initially studied in nonreacting experiments (Sforza et al 1966, Trentacoste & Sforza 1967, Gutmark & Ho 1982, and Husain & Hussain 1983, was used to enhance fine-scale mixing and combustion of fuelrich, gas-generator reaction products . The improvements were due to the complex dynamics of the elliptical vortices (Dhanak & Debernardinis 1981).…”

Section: Introductionmentioning

confidence: 99%

Selective control of flow coherence in triangular jets

Schadow

Gutmark

Parr

et al. 2004

Experiments in Fluids

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The triangular jet was investigated for use as a passive device to enhance fine-scale mixing and to reduce the coherence of large-scale structures in the flow. The suppression of the structures is vital to the enhancement of molecular mixing, which is important for efficient chemical reactions including combustion. The sharp corners in the jet injector introduced high instability modes into the flow via the non-symmetric mean velocity and pressure distribution around the nozzle. Both aerodynamic and hydrodynamic flows showed the difference between the flow at the corner (vertex) and at the flat side. While highly coherent structures could be generated at the flat side, the corner flow was dominated by highly turbulent small-scale eddies. The flow characteristics were tested using hotwire anemometry for mean flow and turbulence analysis, and flow visualization in air and water. List of symbols D D~Di Ev f~ fj L Re R~

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Section: Introductionmentioning

confidence: 99%

Selective control of flow coherence in triangular jets

Schadow

Gutmark

Parr

et al. 2004

Experiments in Fluids

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“…Sforza et al [11] presented a study on three-dimensional, free submerged jets and a year later Trentacoste and Sforza [12] extended their work and performed a more detailed study on the same topic. According to their general findings, the turbulent incompressible 3D jet can be divided into three regions 1, 2, 3 [11,12].…”

Section: Rectangular Turbulent Jetsmentioning

confidence: 99%

“…According to their general findings, the turbulent incompressible 3D jet can be divided into three regions 1, 2, 3 [11,12]. Note that region 1 (potential core) exactly agrees with the "initial region" of the well-known classification characteristics; on the other hand, regions 2 and 3 specify the 3D character of these jets [11,12]:…”

Section: Rectangular Turbulent Jetsmentioning

confidence: 99%

“…maximum value of n = 1 was found at AR = 1 (i.e., cases of square and round jets). The authors in [11] compared their data associated with lengths of the potential core region and the lengths of the characteristic decay region with some data available in the literature. The results indicated that the location of the individual regions for turbulent incompressible jets is not dependent on an exit velocity (i.e., on the Reynolds number) but purely on the exit geometry of the jet.…”

Section: Rectangular Turbulent Jetsmentioning

confidence: 99%

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Synthetic and Continuous Jets Impinging on a Circular Cylinder

Broučková

Trávníček

Vít

2018

Heat Transfer Engineering

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Declaration of authorshipI hereby confirm that the submitted work is entirely my own and was written only with help of referenced literature. iv AbstractSynthetic and continuous jets impinging onto an heated circular cylinder were investigated.The study was performed experimentally. For this reason, a piezoelectrically driven actuator with water as the working fluid was designed. The basic parameters of the experiments were: the slot nozzle width was 0.36 mm, the aspect ratio of the slot was 111, the cylinder diameter was 1.2 mm, and the cylinder-to-nozzle spacing related to the slot width was 5-21.

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“…На рис. 1, b показаны те же данные, но в логарифмическом масштабе и в сравнении с данными турбулентных струй макроразмера [9][10][11][12][13][14]. Необходимо отметить, что если для турбулентных макроструй область потенциаль-ного течения составляет 5−6 калибров сопла, то для микроструй, в зависимости от числа Рейнольдса, эта область изменяется от 3 до 0.…”

Section: поступило в редакцию 12 апреля 2017 гunclassified

Экспериментальное Исследование Дозвуковых Микроструй, Истекающих Из Плоского Сопла

Анискин¹,

Maslov²,

Мухин³

2017

Письма В Журнал Технической Физики

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Поступило в Редакцию 12 апреля 2017 г.Выполнены эксперименты по исследованию дозвуковых ламинарных микро-струй, истекающих из плоского сопла. Размер сопла составлял 83.3 × 3600 µm. Числа Рейнольдса, вычисленные по высоте сопла и средней скорости потока на срезе сопла, составляли от 58 до 154. Рабочим газом являлся воздух комнатной температуры. Определено распределение скорости и пульсаций скорости газа вдоль осевой линии струи. Показано принципиальное отличие полученных характеристик ламинарных дозвуковых микроструй от турбулентных струй макроразмера. На основе измерений пульсаций скорости показано наличие ламинарно-турбулентного перехода и определено его местоположение.

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Studies on three-dimensional viscous jets.

Cited by 219 publications

References 10 publications

Selective control of flow coherence in triangular jets

Selective control of flow coherence in triangular jets

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Экспериментальное Исследование Дозвуковых Микроструй, Истекающих Из Плоского Сопла

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