No description available.

No description available.

No description available.

Gas absorption rates were experimentally determined for a number of tworphase gas-liquid systems in co-current horizontal flow through circular tubes. Sparingly soluble gases were used in order to determine the liquid phase resistance to mass transfer. A series of experiments was designed to separate the effects of gas density, liquid-phase diffusivity, viscosity, surface tension, and tube diameter, on the mass transfer rates. The gas-liquid systems employed, in a single tube 1.757 cm. in diameter, were CO₂-water, He-water, CO₂-ethanol, and CO₂-ethylene glycol. Two additional tube sizes, 1.228 and 2.504.cm. in diameter were employed with the C02-water system to determine the effect of tube diameter. The gas and liquid flow rates used produced four different flow regions, bubble, plug, slug, and annular flow. The gas, and liquid, superficial velocities ranged from 0.1 to 40 fps, and 0.5 to 3.6 fps, respectively. Two correlations were developed for predicting mass transfer rates in two-phase flow. The first, based on a theory that each bubble represents a "mixing stage", is applicable to the bubble and plug regions of flow, and correlates the experimental' data for a wide range of liquid physical properties, as well as gas and liquid flow rates, with a probable error of approximately 15%. The second correlation, applicable to slug flow, empirically correlates the data for this region, over the same wide range of physical properties and flow rates, with a probable error of approximately 10%. The surface renewal or "penetration theory" mechanism of transfer is shown to be consistent with the experimental results obtained in the bubble and plug regions. In the slug region, on the other hand, evidence is available to indicate that another mechanism (probably that proposed by Kishinevskii), becomes increasingly important as the degree of turbulence increases. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

No description available.

The work is devoted to problems of electron microscopy, focusing on the scintillation detector, which is located in chamber separating the field from different pressures. Using of the CAD and CAE was created 3D model of the detector, which took place on calculations focused to influence of the performance of different types of air pumps at gas flow between the chambers. The results of individual variants are compared in graphic form and evaluated.

The purpose of this thesis is to review the history and discuss the present work being done in particle-gas flow, with application to air- augmentation of a particle-carrying, fuel-rich gas jet. A drawing of the model considered is shown in Figure 1, with the area of interest labeled. The thesis is intended as a thorough literature review and analysis.

No description available.

No description available.

The equipment as designed and constructed is a workable solution to the problem of mixing air and oxygen at selectable oxygen concentrations and flow rates. Control of the flow of the individual gases is adequate with the metering elements as designed. The laminated brass stock and shim stock is easily fabricated and works well. The mechanical linkage is the weakest link in the design. The hysteresis in setting concentration and the inaccuracies in setting concentration are primarily related to poor design in the linkage. Ways to possibly improve the linkage are discussed in the Recommendation section of this thesis. The only problem with the read-out design is at low flow rates, i. e., less than 5000 cm³/min (5 -(min)) the scale sticks at times. / Master of Science