Scalar concentration measurements in liquid-phase flows with pulsed lasers

Shan, Jerry W.; Lang, Daniel B.; Dimotakis, Paul E.

doi:10.1007/s00348-003-0717-7

Cited by 28 publications

(9 citation statements)

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“…The laser creates a 7 ns laser pulse with high intensity (65 mJ per pulse), which is coupled into a fluorescent diffuser. The fluorescent light generated in the diffuser remains short (approximately 8 ns) and intense, while both the temporal and spatial coherence have been lost [21][22][23]. This makes it highly suitable for imaging purposes without speckle and interference fringes.…”

Section: Methodsmentioning

confidence: 99%

Velocity Profile inside Piezoacoustic Inkjet Droplets in Flight: Comparison between Experiment and Numerical Simulation

Bos¹,

et al. 2014

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Inkjet printing deposits droplets with a well-controlled narrow size distribution. This paper aims at improving experimental and numerical methods for the optimization of drop formation. We introduce a method to extract the one-dimensional velocity profile inside a single droplet during drop formation. We use a novel experimental approach to capture two detailed images of the very same droplet with a small time delay. The one-dimensional velocity within the droplet is resolved by accurately determining the volume distribution of the droplet. We compare the obtained velocity profiles to a numerical simulation based on the slender jet approximation of the Navier-Stokes equation and we find very good agreement.

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Section: Methodsmentioning

confidence: 99%

Velocity Profile inside Piezoacoustic Inkjet Droplets in Flight: Comparison between Experiment and Numerical Simulation

Bos¹,

et al. 2014

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“…Digital particle image velocimetry (DPIV) is performed to examine the spatial variation of the streamwise, vertical and spanwise velocity components (Adrian, 1991;Raffel et al, 1998;Westerweel, 1997). Planar laser-induced fluorescence (PLIF) is applied to study the structure of a dye plume which is emanated from a point source located at the wave crest in the measurement area (Karasso and Mungal, 1997;Shan et al, 2004). This point source consists of a canula with an inner diameter of 0.8 mm which is connected to a calibrated syringe pump, the inlet flow rate is adjusted to 0.25 ml/min.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of mixed convective flow over a wavy wall

Kuhn

Rohr

2008

International Journal of Heat and Fluid Flow

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“…For serotonin we observed an increase by a factor of 2.5 and for tryptophan by a factor of 1.9. The high excitation power during the pulses leads to fluorescence saturation and photobleaching effects [27].…”

Section: Detection Of Small Aromaticsmentioning

confidence: 99%

Impact of laser excitation intensity on deep UV fluorescence detection in microchip electrophoresis

2008

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A high intensity 266 nm continuous wave (cw-) laser developed for material processing was utilised as an excitation source for sensitive native fluorescence detection of unlabelled compounds in MCE. This 120 mW laser was attached via an optical fibre into a commercial epifluorescence microscope. With this MCE set-up we evaluated the impact of laser power on the S/N of aromatic compounds as well as of proteins. Compared with a previous work which used a 4 mW pulsed laser for excitation, improved S/N for small aromatics and to a lesser extent for proteins could be attained. The LOD of the system was determined down to 24 ng/mL for serotonin (113 nM), 24 ng/mL for propranolol (81 nM), 80 ng/mL for tryptophan (392 nM) and 80 ng/mL for an aromatic diol (475 nM). Sensitive protein detection was obtained at concentrations of 5 mg/mL for lysocyme, trypsinogen and chymotrypsinogen (340, 208 and 195 nM, respectively). Finally, a comparison of the cw-with a pulsed 266 nm laser, operating at the same average power, showed a higher attainable sensitivity of the cw-laser. This can be attributed to fluorescence saturation and photobleaching effects of the pulsed laser at high pulse energies.

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Scalar concentration measurements in liquid-phase flows with pulsed lasers

Cited by 28 publications

References 0 publications

Velocity Profile inside Piezoacoustic Inkjet Droplets in Flight: Comparison between Experiment and Numerical Simulation

Velocity Profile inside Piezoacoustic Inkjet Droplets in Flight: Comparison between Experiment and Numerical Simulation

Experimental investigation of mixed convective flow over a wavy wall

Impact of laser excitation intensity on deep UV fluorescence detection in microchip electrophoresis

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