Results 201 to 210 of about 2,458 (258)
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Pulsating and synthetic impinging jets
Journal of Visualization, 2005This is the second part of a survey summarizing authors' research over a period of two decades on enhancing impinging jet heat and/or mass transfer by periodic unsteadiness of nozzle flow rate. The first part, Tesar and Travnicek (2004 b), identified the reasons why pulsation does not always improve the transfer rate: the pulses do not reach up to the ...
Václav Tesar, Zdenek Trávnícek
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On the Modelling of a Synthetic Jet as a Spherical Jet
Volume 1: Symposia, Parts A and B, 2007The properties of a flow field of a synthetic jet are studied using hot wire anemometry. The experimental results are compared with an analytical model of a continuous jet derived in spherical coordinates. The radial velocity profiles at various radial distances from the synthetic jet orifice, when scaled appropriately collapse into a single self ...
Gopi Krishnan, Kamran Mohseni
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Jet vectoring using synthetic jets
Journal of Fluid Mechanics, 2002The interaction between a conventional rectangular (primary) air jet and a co-flowing synthetic jet is investigated experimentally. The nozzles of both jets have the same long dimension but the aspect ratio of the synthetic jet orifice is 25 times larger.
Smith, B. L., Glezer, A.
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Numerical investigation of synthetic jet flowfields
29th AIAA, Fluid Dynamics Conference, 1998The flowflelds surrounding a synthetic-jet actuating device are investigated numerically by direct simulation. Solutions are obtained to the unsteady compressible Navier-Stokes equations for both the interior of the actuator cavity and for the external jet flowfield.
Donald P. Rizzetta +2 more
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Hybrid synthetic jets as the nonzero-net-mass-flux synthetic jets
Physics of Fluids, 2006The “hybrid synthetic jet” combines the zero-net-mass-flux synthetic jet and fluidic pumping through a valveless pump. No fluid is supplied from an external source (blower or compressor). Hot-wire experiments on a demonstration model confirm that the hybrid synthetic jet exhibits a higher extrusion volume flow rate than the ordinary synthetic jet.
Zdeněk Trávníček +2 more
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Sensors and Actuators A: Physical, 2012
Abstract This paper is a sequel to several recent papers that analysed experimental data on axisymmetric synthetic jets using similarity transformation of governing equations involving a one-equation model of turbulence. Unusual feature there is variation of parameters (“constants”) in transformed equations along the synthetic jet axis. Interestingly,
Václav Tesař, Jozef Kordík
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Abstract This paper is a sequel to several recent papers that analysed experimental data on axisymmetric synthetic jets using similarity transformation of governing equations involving a one-equation model of turbulence. Unusual feature there is variation of parameters (“constants”) in transformed equations along the synthetic jet axis. Interestingly,
Václav Tesař, Jozef Kordík
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A Jet Formation Criterion for Synthetic Jet Actuators
41st Aerospace Sciences Meeting and Exhibit, 2003This paper proposes and validates a jet formation criterion for synthetic jet actuators. The synthetic jet is a zero net mass flux device, adding additional momentum but no mass to its surroundings. Jet formation is defined as a mean outward velocity along the jet axis and corresponds to the clear formation of shed vortices.
Yogen Utturkar +5 more
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A comparison between synthetic jets and continuous jets
Experiments in Fluids, 2003Experimental measurements and flow visualiza- tion of synthetic jets and continuous jets with matched Reynolds numbers are described. Although they have the same profile shape, synthetic jets are wider and slower than matched continuous jets. The synthetic jets are ex- amined at higher Reynolds numbers than previously studied and over a large range of ...
B. L. Smith, G. W. Swift
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Directional control of a jet using synthetic jets
AIP Conference Proceedings, 2017The paper presents an application of synthetic jets in the flow control of a jet. The synthetic jet actuator consists of an oscillating membrane operating at high frequency and separating two cavities with exit slots of different geometries. The synthetic jets work as an alternating push-pull system and the generated vortical structure changes the flow
Florin Frunzulica +3 more
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