Results 41 to 50 of about 1,271,365 (344)
Low Reynolds Number Rotor Blade Aerodynamic Analysis
MATEC Web of Conferences, 2019 Maintaining a steady hover flight in a rotorcraft usually requires high energy input. The aim of the paper is to prove that it is possible to vastly reduce energy use in a rotorcraft by reducing the disc loading.
Tulwin Tytus
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Similarities in Massive Separation Across Reynolds Numbers for Swept and Tapered Finite Span Wings [PDF]
arXiv, 2023 Experimental investigations were performed to elucidate the features of flow fields occurring over cantilevered finite-aspect ratio NACA 0015 wings at high angles of attack with various sweep angles and taper ratios. Volumetric Stereoscopic Particle Image Velocimetry experiments were performed at mean chord based Reynolds number of 247,500 in a wind ...
arxiv
High-Reynolds-number effects on turbulent scalings in compressible channel flow [PDF]
, 2015 The effect of the Reynolds number in a supersonic isothermal channel flow is studied using a direct numerical simulation (DNS). The bulk Mach number based on the wall temperature is 1.5, and the bulk Reynolds number is increased up to Reτ ≈ 1000. The use
BERNARDINI, MATTEO +2 more
core +1 more source
Noisy swimming at low Reynolds numbers [PDF]
Physical Review E, 2009 Small organisms (e.g., bacteria) and artificial microswimmers move due to a combination of active swimming and passive Brownian motion. Considering a simplified linear three-sphere swimmer, we study how the swimmer size regulates the interplay between self-driven and diffusive behavior at low Reynolds number.
Dunkel, J, Zaid, I
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Flow physics of planar bistable fluidic oscillator with backflow limbs
AIChE Journal, Volume 69, Issue 1, January 2023., 2023 Abstract Fluidic oscillators (FOs) are used in a variety of applications, including process control and process intensification. Despite the simple design and operation of FOs, the fluid dynamics of FOs exhibit rich complexities. The inherently unstable flow, jet oscillations, and resulting vortices influence mixing and other transport processes.
Ketan Madane +3 more
wiley +1 more source
Optimal Swimming at Low Reynolds Numbers [PDF]
Physical Review Letters, 2004 Efficient swimming at low Reynolds numbers is a major concern of microbots. To compare the efficiencies of different swimmers we introduce the notion of ``swimming drag coefficient'' which allows for the ranking of swimmers. We find the optimal swimmer within a certain class of two dimensional swimmers using conformal mappings techniques.
Joseph E. Avron, Omri Gat, Oded Kenneth
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AIChE Journal, Volume 69, Issue 2, February 2023., 2023 Abstract The design of economically feasible and profitable production processes has driven companies toward integrated continuous manufacturing by reducing working volumes and increasing operating frequencies. Thus, the development of robust small‐scale devices capable of multivariate process optimization is essential.
Artemis‐Danae Charalambidou +2 more
wiley +1 more source
Optimal Strokes of Low Reynolds Number Linked-Sphere Swimmers
Applied Sciences, 2019 Optimal gait design is important for micro-organisms and micro-robots that propel themselves in a fluid environment in the absence of external force or torque.
Qixuan Wang
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Propulsion at low Reynolds number [PDF]
Journal of Physics: Condensed Matter, 2005 We study the propulsion of two model swimmers at low Reynolds number. Inspired by Purcell's model, we propose a very simple one-dimensional swimmer consisting of three spheres that are connected by two arms whose lengths can change between two values. The proposed swimmer can swim with a special type of motion, which breaks the time-reversal symmetry ...
Najafi, A, Golestanian, R
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Rotor blade design and dynamic characteristics analysis of unmanned helicopter
Hangkong gongcheng jinzhanThe widespread application of composite materials in blades also makes the force and stiffness characteristics of blades more complex than traditional blades.
GAO Hongbo
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