Browsing ME Theses and Dissertations by Type "Dissertation"
Now showing items 1-20 of 58
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3D engineered capillary evaporators for enhanced critical heat flux and heat transfer coefficient in pool boiling and vapor chamber
(Wichita State University, 2020-07)A major challenge in pool-boiling heat transfer lies in the limit of the Critical Heat Flux (CHF) and Heat Transfer Coefficient (HTC), which is caused by the poor counterflow of liquid and vapor over a heated surface, ... -
A methodology utilizing spatial kinematics principles with angular rate sensor and accelerometer data to evaluate ATD head and leg flail kinematics in experimental aerospace seat dynamic impact testing
(Wichita State University, 2016-05)In dynamic aircraft crash testing, the head trajectory of an anthropomorphic test device (ATD) is typically recorded by photometric analysis from the high-speed video. While photometric analysis can provide useful data ... -
Additive and subtractive laser-pulsed nano/micro machining of metal alloys for enhanced material properties, and numerical validation
(Wichita State University, 2020-05)This research focuses on two different aspects of laser machining process, namely additive and subtractive laser micromachining, for inherent improvements to metallic surfaces. In both the processes, material surfaces are ... -
Adsorption and capillary transition-controlled thermal diodes and switches using heterogeneous nanostructures
(Wichita State University, 2017-12)Thermal diodes and switches are systems that enable us to control thermal transport, preferentially in one direction, and switch "on"/"off" on demand. The main challenges of existing thermal diodes and switches are poor ... -
Advancements in pedestrian impact protection and development of pedestrian impactor models
(Wichita State University, 2021-05)Increasing death figures for pedestrian accidents on the roadside has made it one of the most important problems to overcome worldwide. Increasing demand for pedestrian protection is taking a significant role for the ... -
Analysis of bulging, bursting, and reliability-based design and optimization for pipelines
(Wichita State University, 2018-05)Pipelines are subjected to bursting failure under many operating conditions. Predicting the burst capacities of corroded pipelines is significantly relevant to the pipeline industry. The tube bulge test is an advanced ... -
Analysis of orthogonal edge trimming of uni-directional composites: numerical, analytical, and experimental approach
(Wichita State University, 2010-05)As the use of composites increases, more problems arise with processing and manufacturing of this type of material in order to make it a more durable and reliable for today’s applications. One of the most important problems ... -
Analytical modeling of metallic honeycomb for energy absorption and validation with FEA
(2005-05)Honeycomb materials possess high energy absorption characteristics and are useful for the impact protection of structural members. Various honeycomb configurations are being developed for a variety of applications. Analytical ... -
Applications of tungsten sulfide/carbon nanocomposites in thirdgeneration solar cells and their techno-economic analysis
(Wichita State University, 2021-07)Being confronted with the energy crisis and environmental problems, the exploration of clean and renewable energy materials is urgently demanded. Dye-sensitized solar cells (DSSCs) have attracted widespread attention as ... -
Characterization of in-phase and out-of-phase vibration modes of secondary structures attached to a primary structure by experimentation and finite element analysis
(Wichita State University, 2015-05)Ground vibration testing (GVT), is one of the most critical testing procedures for airplane certification. With proper GVT, analysts can determine the stiffness distribution, natural frequencies, mode shapes, and structural ... -
Characterization of mechanical systems with real joints and flexible links
(2006-05)The field of multibody simulations has seen great strides in recent years. Most multibody simulations are carried out under the assumption that the joints involved are ideal. However many real joints are not ideal; they ... -
Control of a passive dynamic compass gait walking robot using neural network central pattern generator
(Wichita State University, 2016-08)Important features in human walking are the passive dynamic nature of its gait and its rhythmic nature, generated from the Central Pattern Generator (CPG) in a human's spinal cord. The passive dynamic mechanism has been ... -
Design and analysis of compliant electrostatic actuators for robotics
(Wichita State University, 2022-05)In this work, two different types of electrostatic actuators (dielectric elastomer actuator and curved electrode actuator) are designed and analyzed. Dielectric elastomer actuators (DEA) are a type of electrostatic actuators ... -
Designing, manufacturing, testing, and modeling motorcycle helmets using hybrid composite systems
(Wichita State University, 2021-12)Roadside motorcycle accidents resulting in brain injury and ultimate death have become an important problem worldwide. Protection of motorcycle riders is an essential goal for motorcycle helmet manufacturers in designing ... -
Dielectric polarization and relaxation of soy protein-based biomaterial and its nanocomposites
(Wichita State University, 2018-12)Plant protein-based biomaterials and biocomposites have gained great interest in non-biological and non-medical applications such as adhesives, foams, and plastics to substitute petroleum-based polymer products, because ... -
Effects of chemical functionalization methods and geometrical configurations of carbon nanotubes on mechanical and thermal properties of polymeric nanocomposites
(Wichita State University, 2017-12)Polymeric nanocomposites have attracted considerable interest, compared to traditional polymeric composites, because of their substantially improved mechanical, thermal, electrical, and magnetic properties, while maintaining ... -
Effects of different processing parameters on covalent functionalization of straight and helical carbon nanotubes for nanocomposite applications
(Wichita State University, 2017-05)Carbon nanotubes (CNTs), as one of the carbon allotropes, have been extensively investigated during the past two decades, due to their unique and extraordinary mechanical, thermal, and electrical properties. They exist ... -
Encapsulated metal hydride and carbon particles in polymeric matrix- an approach to enhances hydrogen storage properties of metal hydrides
(Wichita State University, 2021-05)Energy harvested from the sun can achieve the required residential and industrial energy demands. Thermal energy storage (TES) is a potential option for storing low-grade thermal energy for low- and medium-temperature ... -
Enhanced two-phase cooling using bi-particle-size sintered particle evaporator with distributed liquid supply capillary wicks
(Wichita State University, 2021-08)Liquid-vapor, phase-change heat transfer using wicks can provide reliable and high heat flux cooling capability, especially in microgravity applications. However, the maximum heat removal capacity, also known as Critical ... -
Evaluation of nanoparticles iron-molybdate catalyst using physical properties measurements
(2006-12)Mössbauer spectroscopy, X-ray spectroscopy, SEM, EDX, heat capacity and SQUID measurement were carried out in conjunction with a catalytic study on mixed Fe-Mo oxides, some of which have been used in selective oxidation ...