Resonant Entrainment of a Confined Pulsed Jet

1982 ◽  
Vol 104 (4) ◽  
pp. 482-488 ◽  
Author(s):  
P. G. Parikh ◽  
R. J. Moffat
Keyword(s):  
Resonant Frequency ◽  
Secondary Flow ◽  
Jet Flow ◽  
Quantitative Evidence ◽  
Pulsed Jet ◽  
Organ Pipe

This paper reports the discovery of a new resonant entrainment phenomenon associated with a confined, pulsed jet flow. It was found that a confined jet, when pulsed at an organ-pipe resonant frequency of the confinement tube, experiences greatly enhanced entrainment and mixing near the exit end of the confinement tube compared to a steady confined jet. The mixing and entrainment rates for the resonantly pulsed confined jet approach, and in some cases slightly exceed, those for an unconfined pulsed jet. Both visual and quantitative evidence of this phenomenon is presented. The new effect should be of considerable interest in ejector and combustor design, both of which benefit from any enhancement in mixing between a primary and a secondary flow.

Numerical study of free pulsed jet flow with variable density

2008 ◽  
Vol 49 (5) ◽  
pp. 1141-1155 ◽  
Author(s):  
Wassim Kriaa ◽  
Habib Ben Cheikh ◽  
Hatem Mhiri ◽  
Georges Le Palec ◽  
Philippe Bournot
Keyword(s):  
Numerical Study ◽  
Jet Flow ◽  
Variable Density ◽  
Pulsed Jet

A Numerical Study of the U-Turn Bend in Return Channel Systems for Multistage Centrifugal Compressors

2005 ◽  
Vol 219 (8) ◽  
pp. 749-756 ◽  
Author(s):  
J. M. Oh ◽  
A Engeda ◽  
M. K. Chung
Keyword(s):  
Velocity Profile ◽  
Secondary Flow ◽  
Numerical Study ◽  
Flow Analysis ◽  
Turbulence Models ◽  
Jet Flow ◽  
Complex Flow ◽  
Centrifugal Compressors ◽  
Return Channel ◽  
Channel Systems

A qualitative numerical study of the flow in the U-turn bend of return channel systems for multistage centrifugal compressors is presented. Calculations have been carried out using the flow analysis program FLUENT. The flow in the U-turn bend is highly three-dimensional and complex. The main cause for this is the circumferential variation of the velocity profile at the inlet of the bend. The circumferential variation of the velocity profile is an unavoidable result from the wake/jet flow at the exit of the impeller. In this article, first the effect of the wake/jet flow coming into the U-turn bend is studied. It is shown that the wake/jet flow develops to form the secondary flow in the U-turn bend. The secondary flow, with the high streamline curvature of the flow in the bend, makes the flow inside the bend highly complex. This complex flow is hard to predict with conventional turbulence models that have been developed on the basis of near homogeneity of flows. Comparing the present result with a study that successfully predicted the loss and flow behaviour in the bend, a discussion is presented on the turbulence and the turbulence models. Also, the loss mechanisms in the U-turn bend are discussed in detail.

scholarly journals Formation of vesicles-in-a-vesicle with asymmetric lipid components using a pulsed-jet flow method

RSC Advances ◽  
2019 ◽  
Vol 9 (52) ◽  
pp. 30071-30075 ◽  
Author(s):  
Koki Kamiya ◽  
Toshihisa Osaki ◽  
Shoji Takeuchi
Keyword(s):  
Lipid Vesicles ◽  
Jet Flow ◽  
Lipid Vesicle ◽  
Flow Method ◽  
Pulsed Jet ◽  
Microfluidic Technology ◽  
A Cell ◽  
Lipid Components

We develop a cell-sized asymmetric lipid vesicle system containing small-sized asymmetric lipid vesicles using microfluidic technology.

Formation of Giant Lipid Vesiclelike Compartments from a Planar Lipid Membrane by a Pulsed Jet Flow

2007 ◽  
Vol 129 (42) ◽  
pp. 12608-12609 ◽  
Author(s):  
Kei Funakoshi ◽  
Hiroaki Suzuki ◽  
Shoji Takeuchi
Keyword(s):  
Lipid Membrane ◽  
Jet Flow ◽  
Planar Lipid Membrane ◽  
Pulsed Jet

Flow Control in Serpentine Inlet Duct Using Vortex Generator Jets

2008 ◽  
Author(s):  
R. K. Sullerey ◽  
S. Chandra
Keyword(s):  
Reynolds Number ◽  
Flow Control ◽  
Secondary Flow ◽  
Vortex Generator ◽  
Pulse Frequency ◽  
Combined Effect ◽  
Flow Distortion ◽  
Pulsed Jet ◽  
Constant Area ◽  
Vortex Generator Jets

The objective of the present research is to study the effectiveness of steady and pulsed vortex generator jets in reducing inlet flow distortion and in improving pressure recovery by effective secondary flow control in uniform inflow Serpentine duct diffuser. The measurements were carried out in at a test Reynolds number of 6.5×105 based on the diffuser inlet width. Serpentine duct diffuser consisted of two main portions namely square to circular constant area followed by a circular diffusing duct. Investigations show that the flow in the serpentine diffusing duct suffers from stall on the inner wall and the outflow at AIP has considerable flow distortion due the combined effect of secondary flow and the inner wall stall. It is observed that the use of vortex generator jets both in steady and pulsed modes improve the performance substantially. The number of jets, location of jets, velocity ratios and the pulse frequency are some of the variables that are studied. The results obtained so far suggest that use of pulsed jet not only gives better performance but also reduces the amount of air that need to be injected through the jets in comparison to steady jets for similar velocity ratios.

scholarly journals Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade

Energies ◽  
2017 ◽  
Vol 10 (12) ◽  
pp. 2004 ◽  
Author(s):  
Jie Chen ◽  
Weiyu Lu ◽  
Guoping Huang ◽  
Jianfeng Zhu ◽  
Jinchun Wang
Keyword(s):  
Flow Control ◽  
Jet Flow ◽  
External Energy ◽  
Pulsed Jet ◽  
Blade Cascade

scholarly journals 3PT136 Preparation of cell-sized liposomes by pulsed jet flow(The 50th Annual Meeting of the Biophysical Society of Japan)

2012 ◽  
Vol 52 (supplement) ◽  
pp. S164
Author(s):  
Koki Kamiya ◽  
Ryuji Kawano ◽  
Toshihisa Osaki ◽  
Syoji Takeuchi
Keyword(s):  
Annual Meeting ◽  
Jet Flow ◽  
Pulsed Jet ◽  
Biophysical Society
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