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.
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Showing 1 to 16 of 16 for “"BREAKTHROUGH TIME"”.
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Determining organic vapor cartridge breakthrough characteristics of JP-8 during aircraft fuel tank entry operations
… had a statistically significant effect on breakthrough time versus the 50 percent relative humidity condition, reducing service life by as much as 60 percent at the lowest challenge concentration tested. However, this effect was not statistically significant at the highest concentration. …
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MODELING THE INFLUENCE OF THE HETEROGENEOUS SUBSTRATE ON THE TRANSPORT OF THE JET FUEL SOLUTE PLUME, KIRTLAND AIR FORCE BASE, ALBUQUERQUE, NEW MEXICO
… travel path resulted in a faster than average breakthrough time while, if low conductivity materials were placed in the travel path, particles were either forced to divert around the low K material, which added time and changed the direction of travel, or were forced by the hydraulic gradient …
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Application of synthetic molecular sieve zeolites and silica gel towards the separation of sulfur dioxide from combustion gases
… specified sulfur dioxide-water vapor mixtures. Breakthrough time for sulfur dioxide was found to be an inverse function of the inlet water vapor concentration. For a typical combustion gas stream, (8 percent water vapor) the breakthrough time is roughly 10 percent of the water vapor free value. …
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Numerical reservoir characterization using dimensionless scale numbers with application in upscaling
… of the dimensionless scaling is demonstrated for breakthrough time in an immiscible displacement in three dimensions. Numerical simulations were designed in dimensionless space and converted to dimensional space using several approaches. The resulting estimates of stability limits, numerical …
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Enhanced gas recovery and storage: the role of N2 during natural gas displacement by CO2 flooding in sandstone rocks
… This intends to determine why CO2 has a longer breakthrough time during the EGR process with N2 gas inclusion. The experiment was constructed with varied injection rates at temperatures of 30 and 40 0C. The experiment at 30 °C recorded an extendable breakthrough time over that at 40 °C. The …
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ΒΕΛΤΙΣΤΗ ΕΚΜΕΤΑΛΛΕΥΣΗ ΓΕΩΘΕΡΜΙΚΟΥ ΠΕΔΙΟΥ ΧΑΜΗΛΗΣ ΕΝΘΑΛΠΙΑΣ ΜΕ ΣΥΣΤΗΜΑ ΠΗΓΑΔΙΩΝ
… ILLUSTRATED, BASED ON THE LIMITATIONS IMPOSED BY BREAKTHROUGH TIME AND WATER LEVEL DRAWDOWN. CHAPTER SEVEN INCLUDES A DETAILED STUDY OF DOUBLET AND QUADRUPLET, LEADING TO A COMPARISON BETWEEN THEM. FINALLY IN CHAPTER EIGHT AN APPLICATION EXAMPLE AT MYGDONIA BASIN IS GIVEN. THE THESIS INCLUDES ALSO …
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Remediation of acid mine drainage using natural zeolite
… metals from a continuously flowing solution. The breakthrough time increased with a longer bed height and slower flow rate. The bed depth service time model (BDST) was used to simulate experimental data and deviated from these by 12 – 14%. The treatment of actual Wheal Jane mine AMD showed that …
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The role of micropore size and chemical nature of the pore surface on the adsorption properties of activated carbon fibers
… relationship was observed with the breakthrough time indicating that the lower surface area ACF has superior adsorption properties for low concentrations of n-butane compared to the higher surface area ACF. Gas adsorption isotherms of acetone, benzene, n-butane and nitrogen onto a …
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Predictive Modeling of Organic Pollutant Leaching and Transport Behavior at the Lysimeter and Field Scales
… organic contaminants and thereby acting as a time-dependent upper boundary condition for transport models. For general application of these functions dimensionless numbers known as Damköhler numbers were used to characterize the reaction of the pollutants with the solid matrix. Two functions …
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Studies on improved integrated membrane-based chromatographic process for bioseparation
… membrane. Experimental results show that the breakthrough time and the protein loading capacities were dramatically improved after coating in both UF and MF modules. For a synthetic yeast fermentation broth feed, the Mb and u-LA elution profiles for the four consecutive cyclic runs were almost …
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Separation of n-paraffins by selective adsorption
… model has been developed to predict the breakthrough time using the method of characteristics. The results were in a reasonable agreement with the experimental values. This model has also been utilized to develop the equilibrium isotherm. Optimum operating conditions were achieved at a …
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Modeling multiphysics of traveling wave reactor spent fuel disposal in deep crystalline host rock
… field and induced fluid flow at different time and length scales, with strong coupling of all physics. Given these requirements, the numerical simulations of the coupled thermo-hydraulic behavior of a nuclear waste repository are computationally very expensive. To perform the repository …
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An Improved Vapour Solvent Injection Technique for Enhanced Heavy Oil Recovery
… was operated with a cycle of long shut-in time and short open periods. Solvent breakthrough time, heavy oil production rate, pressure profile, and asphaltene content were measured. The effects of drainage height, gravity, and production configurations were evaluated. Numerical simulations …
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Production of activated carbon from date palm pits and its use in industrial wastewater treatment
The present study investigates, for the first time, the production of granular activated carbon (GAC) from date palm pits, a waste material. Reported data indicates.that the t. yearly production of dates in the Kingdom of Saudi Arabia (KSA) is more than 800 ktonnes of which a significant portion is …
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Characteristics and Mechanisms of Heavy Metal and MTBE Adsorption on Zeolites and Applications in Permeable Reactive Barriers
… The Dose-Response model can describe the breakthrough curves of MTBE adsorption onto ZSM-5 and onto a mixed reactive medium containing clinoptilolite granules and ZSM-5 was used in fixed-bed column tests. In comparison, MTBE adsorption onto a mixed reactive medium containing clinoptilolite …
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Effects of thermally-induced fractures on EGS performance
An Enhanced (or Engineered) Geothermal System (EGS) is defined as an engineered reservoir formed by hydro-fracturing hot dry rock to extract heat from low permeability geothermal resources to generate electricity. EGS technology is undergoing stages of advancement, and a substantial amount of …