Results 11 to 20 of about 35,990 (188)
Identifying Social Media-Based Interactions That Help Adults to Adhere to Weight Loss Goals: A Systematic Review. [PDF]
Obes RevABSTRACT Background Social media may support weight loss through online interaction and support, but its impact on interactions, social support, psychological factors, and weight loss outcomes across socioeconomic groups is unclear. This review aimed to (1) identify social support mechanisms aiding weight loss on social media, (2) pinpoint effective ...
Betz C +3 more
europepmc +2 more sources
Undergraduate Journal of Mathematical Modeling: One + Two, 2020 Wind energy is renewable energy extrapolated from the wind that has the potential to revolutionize our power supply in the near future as fossil fuels become outdated.
Bianca De Haan
doaj +1 more source
The Betz limit and the corresponding thermodynamic limit
Wind Engineering, 2022 The Betz’s limit for the maximum efficiency of an ideal wind turbine imposes a maximum value of about 60% on the conversion of the kinetic energy of an airflow into work. In this paper, we analyze the reason for this value because, from a thermodynamic point of view, it can be 100%.
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Optimal relationship between power and design-driving loads for wind turbine rotors using 1-D models [PDF]
Wind Energy Science, 2020 We investigate the optimal relationship between the aerodynamic power, thrust loading and size of a wind turbine rotor when its design is constrained by a static aerodynamic load.
K. Loenbaek +4 more
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Rotor aerodynamic power limits at low tip speed ratio using CFD [PDF]
, 2014 When investigating limits of rotor aerodynamic models, the Betz limit serves as a solid marker of an upper limit which no model should be able to exceed. A century ago Joukowsky (1912) proposed a rotor aerodynamic model utilizing a rotating actuator disc
Dan Henningson +10 more
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Maximum Efficiency of a Wind Turbine
Undergraduate Journal of Mathematical Modeling: One + Two, 2016 The concept of a wind turbine is not new technology, however, in a day and age where renewable energy is popular, the interest in wind turbines has increased dramatically.
Marisa Blackwood
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Energies, 2020 Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements ...
Marina Barbarić, Zvonimir Guzović
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Numerical study of ducted turbines in bi-directional tidal flows
Engineering Applications of Computational Fluid Mechanics, 2021 Installing a turbine in a duct generally increases the flow through the rotor. If there is flow confinement due to limited water depth, the presence of lateral boundaries, or the presence of adjacent turbines, a further flow enhancement through the rotor
M. Maduka, C.W. Li
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Wind Turbine Power: The Betz Limit and Beyond [PDF]
, 2012 With a severe energy crisis facing the modern world, the production and utilization of ener‐ gy has become a vital issue, and the conservation of energy has acquired prime importance. Energy production and consumption are directly related to everyday life in much of human society, and issues of energy research are extremely important and highly ...
Huleihil, Mahmoud, Mazor, Gedalya
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Two-scale momentum theory for very large wind farms [PDF]
, 2016 A new theoretical approach is proposed to predict a practical upper limit to the efficiency of a very large wind farm. The new theory suggests that the efficiency of ideal turbines in an ideal very large wind farm depends primarily on a non-dimensional ...
Nishino, Takafumi
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