Results 211 to 220 of about 2,278 (239)

Spray atomizer droplet spectrum measurement

The Canadian Journal of Chemical Engineering, 1980
AbstractThe gamma function distribution is used to discuss droplet size variation for flat fan and round orifice atomizers. A technique of using multiple‐probe devices to measure droplet size, distribution and flux when the form of the distribution is known is described.
J. J. C. Picot, T. D. Tomey, J. B. Smedley, D. D. Kristmanson   +3 more
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Study on droplets characteristics used for infrared spectrum suppression

2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015
A model is developed to predict the motion and evaporation characteristics of spray droplets which are used for infrared stealth based on the assumptions of single droplet and spherical symmetry. There are lots of parameters like sprays properties and ambient conditions that affect the stealth process, but only several factors such as wind, irradiation,
Wang Chuan, Yongcheng Du, Zhang Jianguo, Wang Chunhui   +3 more
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A simple droplet spectrum derived from entropy theory

Atmospheric Research, 1994
A preliminary droplet spectrum without collision and coalescence was studied by using entropy theory. It was assumed that droplets occupy arbitrarily with the surface free energy and follow statistical regulation which corresponds with maximum entropy. The derived equation describing cloud droplet spectrum was also obtained as: n(r)=[2Nr/R 2 ].exp(−r 2
Xuewen Zhang, Guoguang Zheng
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A model of the development of the droplet spectrum in a growing cumulus turret

Quarterly Journal of the Royal Meteorological Society, 1986
AbstractA model is presented which describes the growth of the droplet spectrum in a growing cumulus turret in which the vertical velocities are determined by buoyancy forces. It is found that if the entrainment of dry air occurs continuously and homogeneously across the cloud then no enhanced growth of the largest droplets in the spectrum occurs ...
T. A. Hill, T. W. Choularton
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Dessens' Droplets in the Near and Middle Infrared Spectrum of the Sun

Journal of the Atmospheric Sciences, 1974
Abstract Measurements of the monochromatic atmospheric extinction of solar radiation (in the 0.65–13.5 µm wavelength interval) in the Po Valley and neighboring mountainous areas show the occurrence during the morning (after the night inversion) of an evolution both in concentration and size distribution of airborne particulate matter.
Ottavio Vittori, Claudio Tomasi, Rodolfo Guzzi   +2 more
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VELOCITY SPECTRUM MEASUREMENTS IN DROPLET-LADEN JETS

Transactions of the Canadian Society for Mechanical Engineering, 1997
The velocity spectrum characteristics of an axisymmetric, droplet-laden turbulent jet is investigated using laser anemometry. Measurements are carried out at large distances from the nozzle (>100 diameters). The inherent similarity of turbulent droplet-laden jets is investigated. The droplet velocity spectra are obtained at several locations in the
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Oscillation spectrums and beat phenomenon of a water droplet driven by electrowetting

Applied Physics Letters, 2009
Droplet oscillation is an intriguing study that has inspired researches in many fields, and it becomes increasingly important on biochip applications. In this study, amplitude and phase spectrums and beat phenomenon of water droplet oscillation driven by ac electrowetting are studied using frequency scanning method. It is observed by experiment that at
Mei-Feng Lai, Chiun-Peng Lee, Chun-Neng Liao, Zung-Hang Wei   +3 more
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Fermi sea excitations in the optical spectrum of a doped 3He droplet

Chemical Physics Letters, 2012
Abstract The effect of particle–hole excitations of the Fermi sea on the zero-phonon line (ZPL) of the optical spectrum of a chromophore in a 3 He droplet is considered. Due to the finite value of the density of states, the contribution of the low energy particle–hole excitations in the optical spectrum diverges at T →  0.
G. Benedek, V. Hizhnyakov
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The rotational spectrum of single OCS molecules in liquid 4He droplets

The Journal of Chemical Physics, 2000
Single OCS molecules have been embedded in large 4He droplets (N̄=1×103–8×103 atoms) and their infrared spectra in the vicinity of the ν3-fundamental at 2062 cm−1 have been studied using coaxial laser depletion spectroscopy. Sharp lines corresponding to the P- and R-branches with a linewidth of 160 MHz or greater are observed. From the line intensities
Slava Grebenev, Matthias Hartmann, Martina Havenith, Boris Sartakov, J. Peter Toennies, Andrei F. Vilesov   +5 more
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Measuring Spray Atomizer Droplet Spectrum Down to 0.5 µm Size

Transactions of the ASAE, 1985
ABSTRACT A combined light scattering and photographic method was used to measure spray atomizer droplet spectrum down to a droplet diameter of 0.5 pirn. The PMS FSSP scattering probe used was calibrated and a calibration curve based on refractive index is provided. Measured droplet mass flux is within 10% of the mass flux supplied to the atomizers.
null J. J. C. Picot, null X. Bontemps, null D. D. Kristmanson   +2 more
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