How does wave period affect efficiency or the performance of a turbine that is used in owc operations?5 answersThe wave period significantly influences the efficiency and performance of turbines in Oscillating Water Column (OWC) systems. Research has shown that varying wave periods impact turbine efficiency. For instance, in OWC systems, the turbine's operating conditions are optimized by controlling the rotational speed to maintain proximity to the maximum efficiency point, especially under variable wave conditions. Studies have demonstrated that different wave periods, along with wave heights, affect the power generation capacity of OWC systems, with optimal periods identified for enhanced electrical power output. Additionally, simulations have highlighted the importance of considering wave period properties in designing OWC systems to achieve high absorption efficiency based on specific wave characteristics.
How arterial elasticity affects fluid dynamics?4 answersArterial elasticity has a significant impact on fluid dynamics. When the arterial walls are rigid, the flow velocity and wall shear stress are overestimated, and there is less temporal alignment in the pulsatile waveforms. On the other hand, when the arterial walls are elastic, they attenuate the distension waveforms, resulting in a decrease in pressure and volumetric flow waves. This attenuation leads to greater temporal alignment in the waveforms, reducing the oscillation of wall shear stress. Additionally, the stiffness of the arterial wall affects the mean values of flow and wall shear stress, with a stiffer wall causing a significant decrease in these parameters. Overall, arterial elasticity plays a crucial role in modulating fluid dynamics by influencing flow velocity, wall shear stress, and temporal alignment of waveforms.
What is period doubling bifurcation? in vortex induced vibration?5 answersPeriod doubling bifurcation in vortex-induced vibration refers to a phenomenon where the response of the system transitions from a period-1 motion to a period-n motion, where n is greater than 1. This bifurcation occurs in the post-synchronous regime of the system, where the response of the cylinder is no longer synchronized with its natural frequency. The variation of the onset of synchronization and its spectrum over the range of Reynolds number can be depicted using bifurcation diagrams. In the case of a top tension riser (TTR) subject to shear flow VIV, the VIV response of the TTR exhibits Hopf bifurcation phenomena with bistable characteristics. The understanding of these bifurcation phenomena can provide insights for the design and optimization of riser structural parameters.
What is period doubling? in vortex induced vibration?5 answersPeriod doubling in vortex-induced vibration refers to a phenomenon where the motion of a vibrating object transitions from a regular periodic pattern to a pattern with twice the period. This can occur in systems with more than one degree of freedom, such as tethered spheres in a steady flow. In the context of free shear flows, period doubling has been observed in the wake of a circular cylinder, where the flow alternates between oscillation modes with different spanwise structures while maintaining its vortex-street structure. In the case of forced inline oscillating cylinders near a plane boundary, period doubling occurs through a cascade of period doublings of the primary synchronization mode, leading to the creation of desynchronized flows within the Arnold tongue. Nonlinear effects, such as period doubling, can also be exploited to enhance the output power and bandwidth of vibrational energy harvesters.
How do gravitational and heat transfer effects impacts the Cyclic steam stimulation?5 answersGravitational and heat transfer effects have a significant impact on the performance of cyclic steam stimulation (CSS) for bitumen recovery. Heat transfer controls the temperature profile beyond the edge of the steam chamber, which in turn affects the viscosity profile of the oil. The viscosity profile then determines the mobilization of bitumen. The complex interplay between heat transfer and oil mobilization highlights the need for self-corrective recovery processes or dynamic well interventions to ensure efficient heat transfer and oil mobilization. CSS involves drilling a well into the formation and injecting steam at an elevated pressure to fracture the formation and heat the hydrocarbons. The steam invasion of the formation surrounding the fracture leads to the production of heated hydrocarbons. Overall, understanding and optimizing gravitational and heat transfer effects are crucial for improving the efficiency and effectiveness of CSS for bitumen recovery.
Can I study fluids with EDX?2 answersYes, fluids can be studied using EDX. EDX, or energy-dispersive X-ray analysis, is a technique that can be used to analyze the chemical composition of materials, including fluids. For example, in one study, the chemical composition of different composite resins used in periodontal splints was evaluated using EDX. Another study used SEM-EDX to determine the iron distribution in and on ultrafiltration membranes fouled by colloidal iron hydroxide-oxide in drinking water and wastewater effluent treatment. Additionally, EDX was used in a study to collect panchromatic cathodoluminescence (CL) maps of luminescent materials, which can provide information about their elemental composition. Therefore, EDX can be a valuable tool for studying fluids and their chemical composition.