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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"Differential Pressure"”.
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I. Propagation of Small Shock Waves From a Spherical Cavity in an Infinite Isotropic Elastic Media. Ii. A Multitube Differential Pressure Manometer for Measuring the Average Flow of Fluids in Closed Ducts
Made available in DSpace on 2014-12-04T23:26:42Z (GMT). No. of bitstreams: 1 0003993.pdf: 1751871 bytes, checksum: c77a7891a9a68e9cd7c333643fe2fe0b (MD5) Previous issue date: 1952
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Experimental Investigations of Internal Air-water Flows
… as well as laboratory settings. Measurements of differential pressure and the gas and liquid flow rates were collected in vertical upwards air-water flow at near-atmospheric pressure. It was demonstrated that the probability density function of the normalized differential pressure was indicative …
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Development of Adapted Capacitance Manometer for Thermospheric Applications
… one movable plate that is able to make accurate pressure measurements in a low pressure environment. Using detection circuitry, a change in capacitance between the two plates can be measured and correlated to a differential pressure. First, a high sensitivity manometer is produced that exhibits a …
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Investigation Of Pressure Fluctuations In The Hyporheic Zone In Response To Flow Around A Hydraulic Structure
… interface. This study maps hyporheic pressure fluctuations as they are related to surface water velocity. The pressure map is used to evaluate lift enhancement and destabilization forces on the riverbed. High pressure events in the subsurface help generate a destabilizing force from …
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Building a Low-Cost Portable VO2 Max Mask
… measurement, three off-the-shelf sensors (differential pressure, electrochemical oxygen, and NDIR carbon dioxide), an ESP32 microcontroller with Bluetooth Low Energy transmission, and a Python-based logging and analysis pipeline. The system incorporates a BLE protocol that accommodates …
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Impact of vertical internals on the hydrodynamics and heat transfer coefficient in a gas-solid fluidized bed
… hydrodynamic characteristics, flow regime, pressure drop, and heat transfer in a 0.14 m inside diameter gas-solid fluidized bed column of. Two sizes of vertical internal tube bundles (0.0127 and 0.0254 m) of circular arrangement have been implemented to represent the heat exchange tubes …
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Joint Elastic-Electrical Properties of Reservoir Sandstones
… measurements were simultaneously carried out at differential pressures up to 60 MPa. Elastic properties (compressional and shear wave velocity and attenuation) were measured using a pulse-echo technique; electrical resistivity was recorded at AC frequency of 2 Hz using a circumference resistivity …
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Experimental and finite element analysis of high pressure packer elements
… 19.7cm (7-3/4") packer element for a high-pressure high-temperature (HPHT) environment was designed and tested. The element created a seal between the mandrel, or tubing, and the casing. At high temperature and pressure rubber needs to be contained so that it will create and maintain an …
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Computer analysis of asymmetric peaks in gas chromatography
… The column was operated both at normal, high pressure drop (ambient outlet pressure) and low differential pressure (constricted outlet). The condition of high pressure drop caused acceleration of samples through the last two column sections and resulted in much poorer column efficiency. The …
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Ion Filtration and Stable Oxygen Isotopic Fractionation Resulting From the Passage of Sodium-Calcium-Chloride Brine Through Compacted Smectite Layers at Elevated Temperatures and Pressures
… were carried out. In one set the confining pressure on the clay was 5000 pounds per square inch (psi) and the mean brine pressure was 2325 psi; in the other set the values were 10,000 and 4650 psi, respectively. In all experiments the differential pressure across the clay plugs was 2000 psi. …
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Development of Measurement Methods for Monitoring the Effects of Shed Fouling in a Fluid Coker Stripper
… physical obstructions to mimic shed fouling. Differential pressure, radiation transmission, and heat transfer measurements were performed above the sheds to assess the effects of fouling. Each measurement technique can detect the changes in hydrodynamics from adding an obstruction to clean …
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Stress-density relationships for an agricultural soil
… under high loading rates and different confining pressures simulate the multi-pass effect of a tractor wheel loading on the soil. A volume measuring technique was developed to be used in triaxial tests conducted under high loading rates. A sandy clay agricultural soil was tested under …
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Particle-wall shear stress measurements within the standpipe of a circulating fluidized bed
… important forces are the gas and solids phase pressure drop, weight of the bed, and the particle-wall shear stress. Gas pressure drop is measured using differential pressure transducers. The weight of the bed is assumed constant. The wall shear stress is measured utilizing instruments developed …
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An experimental investigation of full-scale sail aerodynamics using pressures, shapes and forces
… This is done by measuring instantaneous pressures and sail shapes at full-scale, and combining them to obtain the aerodynamic forces developed from the sails. The measuring system, developed at the University of Auckland and named FEPV (`Force Evaluation via Pressures and VSPARS'), is …
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Mechanics of swellable elastomeric seals
… provide most of the support for the applied differential pressure. Secondly, in some seals, changing the length of the rubber part of the seal does not significantly affect the maximum differential pressure that the seal can support. Motivated by the experiments showing no dependence of …
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Measurement of total hydrocarbon emissions with MEMS using a portable FID and a novel exhaust flow meter
… hydrocarbons. The V-Cone is an obstructive, differential pressure flow meter that reshapes the flow profile, therefore conditioning the flow.;The Signal Model 3030PM analyzer was found to perform as well or better than the HC analyzers currently used in the FTP test cell. Besides the …
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Hydrogen Loading System Development and Evaluation of Tritiated Substrates to Optimize Performance in Tritium Based Betavoltaics
… loading system onto thin metallic films based on differential pressure in calibrated chambers has been developed for conditions pressures and temperatures up to 69 bar and 500°C, respectively. Experiments on hydrogen loading on to palladium films of thickness 50 and 250 nm were conducted at …
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Techno-Economic Assessment of Electrolytic Hydrogen Production under Dynamic Operations
… conditions, including dynamic operations and differential-pressure operations. The results show that dynamic operation can reduce the levelized cost of hydrogen (LCOH) by 9% compared to steady operation at a nominal current density. Using direct electrochemical compression without the need for …
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Experimental and Computational Study of Roughened Surface For PWR Rod Bundles
… of volumetric flow rate, electrical power, differential pressure, water and heated rod wall temperatures across the smooth and the ribbed surfaces. The team also developed and validated a Computational Fluid Dynamics (CFD) model using the Finite Element Method (FEM) to simulate the …
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Hydrodynamics of trickle bed reactors (TBRS) packed with industrial catalyst using advanced measurement techniques
… measurement techniques of high-frequency differential pressure transducer and load cell. Two different reactor sizes of bench and pilot plant scale were used. Bench-scale TBR carried out the experiments to assess phase distribution and catalyst utilization with 1.18 cm inside diameter and …
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