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Study Of Probabilistic Characteristics Of Local Field Fluctuations In Isotropic Two Phase Composites: Conductivity Type Problems, David Ostberg

Wayne State University Dissertations

Probability distributions of electric …field and electric potential in two-phase particulate composite materials with spherical inclusions are found in the limit of small particle concentration. Additionally a method for the approximation of local fields within random statistically isotropic composites with a …finite number of …field ‡fluctuations which retain potentiality is presented and an approximate solution with the

variational principal for homogenization in statistical terms for three ‡fluctuations within one phase and a homogeneous second phase is found.

Ethanol Autoignition Modeling And Validation At Wide Ranges Of Mixture Temperatures, Pressures, And Equivalence Ratios, Antowan Zyada

Wayne State University Dissertations

A new ethanol detailed kinetic model with 107 species and 1795 reactions was developed by using the reaction mechanism generator (RMG) and a thorough reaction path analysis. The mechanism model was extensively evaluated against measured ignition delay times, laminar flame speeds, and time-resolved species concentrations. The ignition delay experiments were conducted at pressures of 15, 20, and 30 bar, a temperature range of 850 to 1000 K, and equivalence ratios of 0.5, 1.0 and 2.0 using an optically accessible rapid compression machine (RCM). The effect of oxygen concentration on the ignition delay at a fixed equivalence ratio was also measured …

Surfactants, Thermal And Surface Energy Effects On Emulsions’ Transport Properties: A Study Using Lattice Boltzmann Method, Wessam Falih Hasan

Wayne State University Dissertations

This work aims to provide an efficient Gunstensen LBM based CFD model, capable of solving complex problems related to droplets behavior in shear and parabolic flows.

Thermal conditions determine the outcome of the physical and transport properties of emulsions during their various processing phases. A better understanding of the intricate relationship between thermal, surfactants and hydrodynamics can help in the optimization of these processes during the production of emulsions. To investigate the outcome of coupling thermal, surfactants and hydrodynamics on emulsions behavior, a robust quasi-steady thermal-surfactants numerical scheme is presented and used here. To validate the model, the rheological behavior …

Experimental Validation Of An Integrated Guidance And Control System For Marine Surface Vessels, Anthony Composto

Wayne State University Dissertations

Autonomous operation of marine surface vessels is vital for minimizing human errors and providing efficient operations of ships under varying sea states and environmental conditions which is complicated by the highly nonlinear dynamics of marine surface vessels. To deal with modelling imprecision and unpredictable disturbances, the sliding mode methodology has been employed to devise a heading and a surge displacement controller. The implementation of such a controller necessitates the availability of all state variables of the vessel. However, the measured signals in the current study are limited to the global X and Y positioning coordinates of the boat that are …