Theory for Radial Jet Reattachment Flow

Page, R. H.; Hadden, L. L.; Ostowari, C.

doi:10.2514/3.48892

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Another example of an annular impinging jet is the Radial Jet Reattachment (RJR) nozzle (Page et al,1989;Narayanan et al, 1998). The RJR nozzle is an annular nozzle with a predominantly radial orientation of an exit slot.…”

Section: Bistable Impinging Jetsmentioning

confidence: 99%

Visualization and mass transfer with a bistable two-slot impinging jet

Trávníček

Maršík

2003

J Vis

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Abs ract : A two-dimensional air impinging jet with a passive control has been studied experimentally, and smoke visualization, measurement of mean flow characteristics, and mass transfer experiments have been performed. Investigated flow field is intrinsically bistable, and two flow patterns exist under the same boundary conditions. The both patterns differ in a "bubble of separated flow", either a small or large recirculation area is embraced inside the jet. A change between flow field patterns is hysteretic in character. The large recirculation area bridges the whole nozzle-to-wall spacing, and seems to be very promising for an augmentation of heat/mass transfer. t

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Section: Bistable Impinging Jetsmentioning

confidence: 99%

Visualization and mass transfer with a bistable two-slot impinging jet

Trávníček

Maršík

2003

J Vis

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“…Modifications to conventional circular or slot jets have been proposed by several researchers as a means to enhance impingement heat transfer. Some of these modifications include placing devices within the nozzle to cause swirl (Huang et al, 1998), periodic forcing (Hill and Greene, 1977;Hasan and Hussain, 1982;Tesar and Travnicek, 2006), and causing the jet to reattach (Page et al, 1988). To document enhancements in heat transfer obtained by these new geometries there is a need to quantify not only the time and/or spatially averaged data, but also flow structure and surface temperature on a spatially and temporally resolved scale.…”

Section: Introductionmentioning

confidence: 99%

Oscillatory thermal structures in a reattaching jet flow

Narayanan

2007

J Vis

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Spatially varying surface temperature oscillations in a nominally steady reattaching slot jet at a Reynolds number (Re) of 5000 are analyzed using Proper Orthogonal Decomposition (POD) for two nozzle-to-surface spacings, and three exit openings of the nozzle. The surface temperature data in these experiments were recorded using infrared thermography at a frequency of 20 Hz along two selected lines on the impingement surface corresponding to geometrically similar and dissimilar regions within the reattachment curtain. The magnitude of temperature oscillations were found to increase with an increase in exit opening for the larger nozzle spacing. The POD analysis results indicate that a majority of the temperature flucutations are well captured by 15 dominant modes. In many cases, the three dominant modes accounted for approximately 60 percent of the variance in surface temperature fluctuation.

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“…The location where the flow reattaches at the impingement surface, R r , creates the highest local pressure, and at or close to that location the greatest surface heat transfer. A theoretical analysis of laminar and turbulent radial jets by Page et al (1989) indicated the degree to which the radial jet would curve towards the plate. This analysis evaluated the dependence of RJR flow field parameters on nozzle parameters including exit angle, nozzle radius and height per exit gap, gap Reynolds number, and a turbulent spread parameter.…”

Section: Introductionmentioning

confidence: 99%