Flow-field measurements of liquid and gaseous phases in the ultra-dense region of diesel sprays

Wissel, S.; Grünefeld, Gerd

doi:10.1007/s00340-006-2185-2

Cited by 11 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LFT/MTV can have advantages in dense sprays and is relatively insensitive to beam steering compared to PDI and PIV. Simultaneous droplet and gas velocity measurements have been demonstrated near the nozzle of a diesel spray using LFT with spectrally distinguishable phosphorescent tracers [79,82].…”

Section: Planar Velocity Measurementsmentioning

confidence: 99%

“…Measurements of the nozzle-exit flow conditions are critical for fundamental and practical spray modeling. Laser-Doppler velocimetry (LDV) [177], laser correlation velocimetry [205] (essentially a two-point time-of-flight technique), ultrafast phase-contrast x-ray imaging [206], and laser flow tagging [82,207] using laser-induced fluorescence (LIF) or phosphorescence have had some success for nozzle-exit velocity and turbulence profiles.…”

Section: Upstream Internal Nozzle Flow Regionmentioning

confidence: 99%

“…Timeaveraged near-and far-field slip velocity has been measured using Doppler global velocimetry (DGV) in a kerosene spray flame [77]. Laser flow tagging (LFT) has yielded simultaneous planar measurements of near-field droplet and gas-phase velocity in a diesel spray [79,82], although slip velocity was not explicitly evaluated.…”

Section: Near-nozzle Measurement Needsmentioning

confidence: 99%

“…PDI is already capable of simultaneously measuring droplet size, droplet velocity and gas-phase velocity (using the Doppler signals from droplets that are small enough to follow the local turbulent flow) [2]. As mentioned in section 3.3.2, simultaneous droplet and gas-phase velocity measurements have also been performed with PIV using the different wavelengths of Mie scattering and fluorescence to distinguish droplets from gas-flow tracers [67,68,71], while LFT has been used for simultaneous droplet-gas velocity-field measurements without particle seeding [82]. Wieske et al [87] measured exciplex fluorescence at two wavelengths to measure liquid-phase temperature along with liquid and vapor distributions.…”

Section: Simultaneous Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

Spray measurement technology: a review

Fansler¹,

Parrish²

2014

Meas. Sci. Technol.

215

118

View full text Add to dashboard Cite

Sprays are among the most intellectually challenging and practically important topics in fluid mechanics. This paper reviews needs, milestones, challenges, and a broad array of techniques for spray measurement. In addition, tabular summaries provide cross-referenced entry points to the vast literature by organizing over 300 citations according to key spray phenomena, physical parameters and measurement techniques for each of the principal spray regions (nozzle internal flow, near-field spray-formation region, far-field developed spray, and spray-wall interaction). The article closes with perspectives on some current issues in spray research, including the cost and complexity of apparatus for spray physics and spray engineering, the need for simultaneous diagnostic measurements under application-relevant conditions, and the effective comparison of spray measurements and numerical simulations.

show abstract

Section: Planar Velocity Measurementsmentioning

confidence: 99%

Section: Upstream Internal Nozzle Flow Regionmentioning

confidence: 99%

Section: Near-nozzle Measurement Needsmentioning

confidence: 99%

Section: Simultaneous Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Spray measurement technology: a review

Fansler¹,

Parrish²

2014

Meas. Sci. Technol.

215

118

View full text Add to dashboard Cite

show abstract

“…5,6 However, the usefulness of phosphorescence in sprays depends on the tracer/molecule used. Solvent phosphorescence, such as used in acetone and biacetyl sprays, 7,8 has a relatively short lifetime (∼1 µs) which limits its use for flow tracking. Lanthanide-based phosphorescence, where rare earth metal ions are added to a solvent, is known to have a relatively long lifetime of a) d.d.v.d.voort@tue.nl milliseconds instead of microseconds.…”

Section: Introductionmentioning

confidence: 99%

Lanthanide-based laser-induced phosphorescence for spray diagnostics

Voort

Maes

Lamberts

et al. 2016

Review of Scientific Instruments

View full text Add to dashboard Cite

Laser-induced phosphorescence (LIP) is a relatively recent and versatile development for studying flow dynamics. This work investigates certain lanthanide-based molecular complexes for their use in LIP for high-speed sprays. Lanthanide complexes in solutions have been shown to possess long phosphorescence lifetimes (∼1-2 ms) and to emit light in the visible wavelength range. In particular, europium and terbium complexes are investigated using fluorescence/phosphorescence spectrometry, showing that europium-thenoyltrifluoracetone-trioctylphosphineoxide (Eu-TTA-TOPO) can be easily and efficiently excited using a standard frequency-tripled Nd:YAG laser. The emitted spectrum, with maximum intensity at a wavelength of 614 nm, is shown not to vary strongly with temperature (293-383 K). The decay constant of the phosphorescence, while independent of ambient pressure, decreases by approximately 12 μs/K between 323 and 373 K, with the base level of the decay constant dependent on the used solvent. The complex does not luminesce in the gas or solid state, meaning only the liquid phase is visualized, even in an evaporating spray. By using an internally excited spray containing the phosphorescent complex, the effect of vaporization is shown through the decrease in measured intensity over the length of the spray, together with droplet size measurements using interferometric particle imaging. This study shows that LIP, using the Eu-TTA-TOPO complex, can be used with different solvents, including diesel surrogates. Furthermore, it can be easily handled and used in sprays to investigate spray breakup and evaporation.

show abstract