Results 291 to 300 of about 950,297 (340)

Study on the Temporal and Spatial Evolution Mechanism of Rotating Cavitation in the First Stage Impeller of LNG Submersible Pump With Two‐Stage Splitter Blades

Energy Science &Engineering, EarlyView.
ABSTRACT This study establishes a full‐flow passage numerical model of an LNG submerged pump equipped with two‐stage splitter blades through three‐dimensional modeling. Numerical simulations validated by liquid nitrogen experiments demonstrate that at 1.4 times the design flow rate, the peak efficiency reaches 60.6%, with a maximum head of 194.93 m ...
Songyu Yao, Weibin Zhang, Dingqi Zhang, Qifeng Jiang, Chenyu Wang   +4 more
wiley   +1 more source

Multi‐Physics Pinhole Size Tolerance Analysis on the Leakage Characteristics and Performance of Proton Exchange Membrane Fuel Cells

Energy Science &Engineering, EarlyView.
ABSTRACT This study delves into exploring how pinhole size affects both the electrochemical efficiency and hydrogen leakage within proton exchange membrane fuel cells (PEMFCs). The researchers devised a comprehensive multiphysics field model for the PEMFC and employed the finite element method to simulate various pinhole diameters, evaluating their ...
Junyi Chen, Yuxuan Luo, Lan Zhang, Trevor Hocksun Kwan, Qinghe Yao   +4 more
wiley   +1 more source

Performance Improvement of Hybrid Vertical Axis Wind Turbines Equipped With J‐Shaped Blades

Energy Science &Engineering, EarlyView.
This study presents a novel hybrid vertical axis wind turbine, utilizing J‐shaped blades in Darrieus rotor. The proposed configuration shows the potential of J‐shaped blades in improving the overall performance of hybrid rotors. ABSTRACT Vertical axis wind turbines (VAWTs) are emerging as a promising solution for urban wind energy harvesting, owing to ...
Narges Kashani, Mojtaba Mirhosseini, Rouhollah Ahmadi, Hamidreza Mirzaeian   +3 more
wiley   +1 more source

Numerical Study on the Effect of Structural Variation of S‐Shaped Flow Channel Absorber on the Thermal Performance of Line‐Focusing Fresnel Lens Solar Collector

Energy Science &Engineering, EarlyView.
ABSTRACT As a clean and renewable energy source, solar energy development and utilization have garnered significant attention. This study investigates the potential of Fresnel lenses to enhance the thermal efficiency of solar collectors by analyzing the effects of water flow channel structure and flow rate on heat gain.
Huaping Zhang, Qiongqiong Yao, Peizheng Liu, Zhangyang Kang, Rufei Tan, Jin Xu   +5 more
wiley   +1 more source

Life at low Reynolds number [PDF]

AIP Conference Proceedings, 1976
E d i t o r’s note: This is a reprint (slightly edited) of a paper of the same title that appeared in the book Physics and Our World: A Symposium in Honor of Victor F. Weisskopf, published by the American Institute of Physics (1976). The personal tone of the original talk has been preserved in the paper, which was itself a slightly edited transcript of
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Intermittency and Reynolds number

Physics of Fluids, 1998
Hot wire measurements of longitudinal and transverse increments are performed in three different types of flows on a large range of Reynolds numbers (100≲Rλ≲3000). An improved technique based on cumulant expansion of velocity structure functions is used to estimate the spreading of the pdfs and to study their scaling properties in the inertial range ...
Kahalerras, H., Malecot, Yann, Gagne, Yves, Castaing, Bernard   +3 more
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The cell Reynolds number myth

International Journal for Numerical Methods in Fluids, 1985
AbstractThe commonly accepted linear stability analysis for the forward‐time centred‐space (FTCS) algorithm applied to the transport equation has led to the concept of a cell Reynolds number restriction on the spatial grid size. This paper shows where the commonly accepted original analysis is in error and presents the correct stability restrictions ...
Brent W. Webb, Joe D. Hoffman, H. Doyle Thompson   +2 more
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Effects of Reynolds Number and Turbulent Intensity on a Low Reynolds Number Airfoil [PDF]

32nd AIAA Applied Aerodynamics Conference, 2014
The work investigates the effect of turbulent intensity (Tu) on the force and wake of a NACA0012 airfoil at chord Reynolds number Rec = 5.3×103 and 2×104. Lift and drag coefficients (CL and CD) on and flow fields around the airfoil were measured with Tu varied from 0.6% to 6.0%.
Shu Wang, Yu Zhou, Md. Mahbub Alam
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Uniqueness and the Cell Reynolds Number

SIAM Journal on Numerical Analysis, 1980
Using some results from the theory of M-functions, we show how uniqueness and multiplicity of solutions for three finite-difference approximations of the steady Burgers equation are related to the cell Reynolds number.
R. B. Kellogg, G. R. Shubin, A. B. Stephens   +2 more
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Low-Reynolds-number predator

Physical Review E, 2015
To generalize simple bead-linker model of swimmers to higher dimensions and to demonstrate the chemotaxis ability of such swimmers, here we introduce a low-Reynolds predator, using a two-dimensional triangular bead-spring model. Two-state linkers as mechanochemical enzymes expand as a result of interaction with particular activator substances in the ...
Mohammad Reza Ejtehadi, Mehran Ebrahimian, Mohammad Yekehzare   +2 more
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