Browsing by Subject "Erosion Modeling"
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Item Advancement of Erosion Testing, Modeling, and Design of Concrete Pavement Subbase Layers(2010-10-12) Jung, Youn SuConcrete pavement systems have great capacity to provide long service lives; however, if the subbase layer is improperly designed or mismanaged, service life would be diminished significantly since the subbase layer performs many important roles in a concrete pavement system. The erosion of material beneath a concrete slab is an important performance-related factor that if applied to the selection of base materials can enhance the overall design process for concrete pavement systems. However, erosion of the subbase has not been included explicitly in analysis and design procedures since there is not a well accepted laboratory test and related erosion model suitable for design. Previous erosion test methods and erosion models are evaluated in terms of their utility to characterize subbase materials for erosion resistance. With this information, a new test configuration was devised that uses a Hamburg wheel-tracking device for evaluating erodibility with respect to the degree of stabilization and base type. Test devices, procedures, and results are explained and summarized for application in mechanistic design processes. A proposed erosion model is calibrated by comparing erosion to lab test results and LTPP field performance data. Subbase design guidelines are provided with a decision flowchart and a design assistant spread sheet for the economical and sustainable design of concrete pavement subbase layers by considering many design factors that affect the performance of the subbase.Item Experimental Measurement of Multiphase Flow and CFD Erosion Modeling in Electrical Submersible Pumps(2015-01-05) Pirouzpanah, SahandElectrical Submersible Pumps (ESPs) are widely being used in upstream oil production. To better understand the ESP pump?s behavior, two different ESPs, MVP-G470 and ESP-WJE1000, manufactured by Baker Hughes company have been studied experimentally and numerically to determine the pump and flow behavior in different operating conditions and for different working fluids. The MVP-G470 is a multi-vane electrical submersible pump which has been designed to increase the gas handling capacity of typical multiphase ESPs up to 70% gas volume fraction. Homogenized flow and finer bubbles produced by MVP pumps help the ESPs to delay the surging and gas lock condition to higher gas volume fractions and operate effectively. In this work, an experimental study on the performance of a 3-stage MVP along with detail study on the performance of two stages of the pump are performed. Overall pump performance for different operating conditions such as different inlet pressure, inlet gas volume fraction, water flow rate and speeds are performed for a mixture of water and air. Detail study of a stage performance is done on the first and second stage of the pump using conductivity and pressure measurements accompanied by high speed visualization. The data obtained from these measurements is employed to relate stage head degradation to effective parameters on the pump performance. The ESP-WJE1000 is a typical mixed flow ESP pump with a single vane rather than split-vane design used in MVPs. Numerical study on the erosion phenomena in this pump has been performed. The influence of key parameters on erosion in ESPs has been identified and a new model to predict the erosion rate at different pump locations has been introduced.