Parametric study on impinging-jet liquid sheet thickness distribution using an interferometric method

Choo, Yeon-Jun; Kang, Boseon

doi:10.1007/s003480000258

Cited by 55 publications

(34 citation statements)

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“…(1), it has been assumed that the velocity distribution is equal throughout the flatjet. A refinement where this assumption was relaxed (as suggested by experimental flow velocity measurements, 62 or by assumption of a Poiseuille flow distribution 56,57 ) shows that the thickness behaviour remains the same, except for an overall magnitude scaling factor 64 . The flatjet dependence on the value of the impact angle α has been investigated in several studies 62,63,65,66 .…”

Section: Flatjet Characterisation Under 1 Bar Conditions: Mid-infrarementioning

confidence: 99%

A liquid flatjet system for solution phase soft-x-ray spectroscopy

Ekimova

Quevedo

Faubel

et al. 2015

Structural Dynamics

123

135

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We present a liquid flatjet system for solution phase soft-x-ray spectroscopy. The flatjet set-up utilises the phenomenon of formation of stable liquid sheets upon collision of two identical laminar jets. Colliding the two single water jets, coming out of the nozzles with 50 μm orifices, under an impact angle of 48° leads to double sheet formation, of which the first sheet is 4.6 mm long and 1.0 mm wide. The liquid flatjet operates fully functional under vacuum conditions (<10−3 mbar), allowing soft-x-ray spectroscopy of aqueous solutions in transmission mode. We analyse the liquid water flatjet thickness under atmospheric pressure using interferomeric or mid-infrared transmission measurements and under vacuum conditions by measuring the absorbance of the O K-edge of water in transmission, and comparing our results with previously published data obtained with standing cells with Si3N4 membrane windows. The thickness of the first liquid sheet is found to vary between 1.4–3 μm, depending on the transverse and longitudinal position in the liquid sheet. We observe that the derived thickness is of similar magnitude under 1 bar and under vacuum conditions. A catcher unit facilitates the recycling of the solutions, allowing measurements on small sample volumes (∼10 ml). We demonstrate the applicability of this approach by presenting measurements on the N K-edge of aqueous NH4+. Our results suggest the high potential of using liquid flatjets in steady-state and time-resolved studies in the soft-x-ray regime.

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Section: Flatjet Characterisation Under 1 Bar Conditions: Mid-infrarementioning

confidence: 99%

A liquid flatjet system for solution phase soft-x-ray spectroscopy

Ekimova

Quevedo

Faubel

et al. 2015

Structural Dynamics

123

135

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“…Among these, the interference technique is the most commonly used for measurement of thickness variation in a liquid sheet (Villermaux & Clanet 2002;Dombrowski et al 1960;Matsumoto & Takashima 1971;Bremond et al 2007;Choo & Kang 2001) including soap films (Liang & Chan 1997). Here, interference fringes represent contours of constant thickness so that the profiles of the film thickness can be constructed when distance between fringes are accurately known.…”

Section: Introductionmentioning

confidence: 99%

Stability of a moving radial liquid sheet: experiments

2015

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A recent theory [Tirumkudulu & Paramati, "Stability of a moving radial liquid sheet: Time dependent equations.", Phys. of Fluids, 102107, 25, 2013] for a radially expanding liquid sheet that accounts for liquid inertia, interfacial tension and thinning of the liquid sheet while ignoring inertia of surrounding gas and viscous effects shows that such a sheet is convectively unstable at all frequencies and Weber numbers (W e ≡ ρ l U 2 h/σ) to small sinuous disturbances. Here, ρ l and σ are the density and surface tension of the liquid, respectively, U is the speed of the liquid jet, and h is the local sheet thickness. In this study, we use a simple non-contact optical technique based on laser induced fluorescence to measure the instantaneous local sheet thickness and its displacement of a circular sheet produced by head on impingement of two laminar jets. When the impingement point is disturbed via acoustic forcing, sinuous waves produced close to the impingement point travel radially outward. The phase speed of the sinuous wave decreases while the amplitude grows as they propagate radially outwards. Our experimental technique was unable to detect thickness variations in the presence of forcing suggesting that the variations could be smaller than the resolution of our experimental technique. The measured phase speed of the sinuous wave envelope matches with predictions while there is a qualitative agreement in case of spatial growth. We show that there is a range of frequencies over which the sheet is unstable due to both aerodynamic interaction and thinning effects while outside this range, thinning effects dominate. These results imply that a full theory that describes the dynamics of a radially expanding liquid sheet should account for both effects.

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“…Previous analytical studies have included the modeling of the thickness, 2-6 shape, [4][5][6][7] and velocity 6 of the liquid sheet, as well as the size of the droplets detaching from the rim of the liquid sheet. 8 Some experimental studies have also focused on the thickness, [9][10][11][12] shape, [5][6][7]9,13 and velocity [13][14][15] of the liquid sheet and on the droplet size. 6,7 The velocity distribution of the liquid sheet is closely related to the direction of motion and the kinetic energy of the droplets disintegrating from the liquid sheet.…”

Section: Introductionmentioning

confidence: 99%

The effect of jet velocity profile on the characteristics of thickness and velocity of the liquid sheet formed by two impinging jets

Choo

Kang

2007

Physics of Fluids

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In this study, the effect of jet velocity profile on the thickness and velocity of the liquid sheet formed by two low-speed impinging jets was investigated. In addition to the constant jet velocity and the Poiseuille parabolic profile, the jet velocity profile measured experimentally was considered to account for the real nonuniform jet velocity profile. For three jet velocity profiles, the distributions of the thickness and velocity of the liquid sheet were analytically predicted by solving conservation equations for mass, momentum, and energy. The predicted results were compared with the previous experimental results. The jet velocity profile affected the resulting thickness and velocity characteristics of the liquid sheet. The distributions of the thickness and velocity of the liquid sheet predicted by using the measured jet velocity profile produced more acceptable results, which agreed better with the experimental observations, than those obtained by using the constant jet velocity, which has been commonly used in previous theoretical works.

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Parametric study on impinging-jet liquid sheet thickness distribution using an interferometric method

Cited by 55 publications

References 0 publications

A liquid flatjet system for solution phase soft-x-ray spectroscopy

A liquid flatjet system for solution phase soft-x-ray spectroscopy

Stability of a moving radial liquid sheet: experiments

The effect of jet velocity profile on the characteristics of thickness and velocity of the liquid sheet formed by two impinging jets

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