Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 26 for “"Drop Size Distribution"”.
-
RELAMPAGO-CACTI drop size distribution observations and the implications for cloud and hydrologic studies
Comparisons of drop size distributions (DSD) properties and rainfall modes among three deep convective regions (the U.S. Southern Great Plains, in Córdoba Province in subtropical South America, and Manacapuru in central Amazonia) where heavy rain-producing systems contribute the majority of …
-
Coalescence of secondary dispersions in fibrous beds
… behaviour and methods of separation of droplets less than one hundred micrometres in diameter has been reviewed with particular reference to fibrous bed coalescers. The main operating parameters were identified as inlet drop size distribution, phase ratio, superficial velocity and the …
-
The application of IBM PC's and distrometers in a satellite propagation experiment
… experiment. The uses and methods of collecting drop size distribution are discussed as are the uses of IBM-PC's for both data collection and control. Methods of requiring the PC's to operate in real time are also included.
-
Mechanisms of liquid extraction in a pilot plant sieve plate column
The literature pertinent to droplet hydrodynamics and mass transfer in perforated (sieve)plate liquid-liquid extractor columns has been reviewed. An experimental investigation was conducted in a 450 mm diameter perforated plate extractor with four plates using four different designs with holes of …
-
Mass transfer characteristics of two-aqueous-phase liquid-liquid mixtures
… transfer rates were studied using the falling drop method. Cibacron Blue 3 GA dye was the transferring solute from the salt phase to the PEG phase. Measurements were undertaken for several concentrations of the dye and the phase-forming solutes and with a range of different drop sizes, e.g. …
-
Rain attenuation and depolarization along 10 to 30 GHz earth space links predicted from s-band dual-polarized radar measurements
… computer model BSCAT to infer rain drop size distribution along the slant path from radar measured reflectivity and differential reflectivity data collected along the path. Then, two semi-empirical models are developed which predict attenuation from radar measured reflectivity and …
-
A study of liquid-liquid extraction in a sieve plate column
… surveyed. Mass transfer characteristics during drop formation, rise and coalescence, and related models were also reviewed. Important design parameters i.e. flooding, dispersed phase hold-up, drop size distribution, mean drop size, coalescence/flocculation zone height beneath a plate and jetting …
-
Examination of the behavior of modis-retrieved cloud droplet effective radius through misr-modis data fusion
… System, the effective radius (Re) of the cloud drop size distribution plays an important role in the energy and water cycles of the Earth system. Re is retrieved from several passive sensors, such as the Moderate Resolution Imaging Spectroradiometer (MODIS), based on a visible and near-infrared …
-
Rain depolarization scatter prediction
… as the usually predicted mean values. It emphasizes depolarization and develops data for waves with frequencies ranging from 4 to 34.8 GHz propagating in rain cells which vary in intensity from light to severe. General causes of output scatter are included, and the scatter induced by the rain …
-
Study of slant path attenuation ratios derived from a dual-polarized radar
… which used a dual-polarized radar to estimate drop size distributions on a slant path between Blacksburg, Virginia, and the Intelsat VA F10 satellite. The effect of varying drop size distributions on attenuation ratios is discussed. An uplink power control simulation is developed using the …
-
Liquid-liquid extraction in a pilot scale rotating disc contactor
… of extractor and the relevant phenomena, such as droplet break-up and coalescence, drop mass transfer and axial mixing has been revjewed. Experiments were performed using the system C1airsol-350-acetone-water and the effects of drop size, drop size-distribution and dispersed phase hold-up on the …
-
An acoustic water tank disdrometer
… representation of the numbers of large raindrops than is available from current commercial instruments. This thesis describes the development of an acoustic instrument that determines rain parameters from the sound of raindrops falling into a tank of water. It is known as the acoustic water …
-
Mechanisms of secondary dispersions separation in particulate beds
The mechanisms by which drops of secondary liquid dispersion ie. <100μ m, are collected, coalesced and transferred have been studied in particulate beds of different sizes and heights of glass ballotini. The apparatus facilitated different coalescer cell arrangements. The liquid-liquid system was …
-
Liquid entrainment from spray distributors for packed columns
… is based on a mathematical representation of the drop size distribution in sprays, and on the drop buoyancy equations. It takes into account flow rates and physical properties of the gas and liquid as well as the orifice diameter of the spray nozzles. An experimental investigation for measuring …
-
Optimizing Z/R Relationship for Radar-based Precipitation Estimates
… as Z = aRb where a and b are correlated with drop size distribution (DSD) and vary across locations. Using a Z/R relationship to translate radar reflectivity to rainfall rate can allow for real-time precipitation monitoring with a high temporal and spatial resolution. A dataset of 12 cases in …
-
Purification of phosphoric acid by solvent extraction
… the type of solvent. The chemical equilibria and distribution curves for the system water - phosphoric acid - solvent for the solvents n-amyl alcohol, tri-n-butyl phosphate, di-isopropyl ether and methyl isobutyl ketone have been determined. Both pure phosphoric acid and acid containing known …
-
Assessing the impacts of microphysical and environmental controls on simulated supercell storms
… diagnosed. Two such parameters, the width of the drop size distribution and the choice of liquid collection efficiencies, are examined in Chapter 2. Simulations of a supercell were performed in which the collection efficiency dataset and the a priori width of the rain drop size distribution (DSD) …
-
Characterization and modeling of aerosol-cloud interactions toward the improvement of rainfall estimation in high mountains
… results from the vertical evolution of the rain drop-size distributions (RDSDs). Explicit modeling of the rainfall microphysics from the top of the blind zone, if located below the zero-degree isotherm, towards the surface can improve rainfall estimation at the ground, as demonstrated in the …
-
Study of the Performance of a Large Mechanically-Agitated Extraction Column
… extraction columns and relevant phenomena eg. droplet break-up and coalescence, axial mixing, single drop mass transfer mechanisms and flooding/phase-inversion, and related mathematical models have been reviewed. An experimental study was performed of the hydrodynamic and mass transfer …
-
Aerosol Optical Depth And Its Relationship To Radar Derived Precipitation In Mali, West Africa
… for initial clouds to produce precipitation-sized drops); however, the aerosol burden does not affect the amount of precipitation produced by individual detected cells that are able to form. These results, as well as previous studies, suggest that Mali's operational weather modification …
Page 1 of 2