Results 81 to 90 of about 1,271,365 (344)

Passive swimming in low Reynolds number flows

, 2010
The possibility of microscopic swimming by extraction of energy from an external flow is discussed, focusing on the migration of a simple trimer across a linear shear flow.
J. Happel, Piero Olla
core   +1 more source

High‐Yield Bioproduction of Extracellular Vesicles from Stem Cell Spheroids via Millifluidic Vortex Transport

Advanced Materials, EarlyView.
Stem cell spheroids, produced via a high‐throughput microfabrication technique, are transported within a vortex generated at the outlet channels of a cross‐slot millifluidic chip. For Reynolds number exceeding 170–200, intermittent high shear stresses applied to each spheroid within the vortex trigger a massive release of biologically active ...
Elliot Thouvenot, Laura Charnay, Noa Burshtein, Jean‐Michel Guigner, Léonie Dec, Damarys Loew, Amanda K.A. Silva, Anke Lindner, Claire Wilhelm   +8 more
wiley   +1 more source

Estudo do amortecimento do pêndulo simples: uma proposta para aplicação em laboratório de ensino

Revista Brasileira de Ensino de Física
Os pêndulos são muito empregados nas atividades de ensino de cursos introdutórios de física. Nessas atividades, frequentemente, faz-se uso de modelos ideais para estudar o comportamento do pêndulo.
Francisco José Arnold, Rangel Arthur, Leonardo Lorenzo Bravo-Roger, Marcos Sérgio Gonçalves, Mário José Garrido de Oliveira   +4 more
doaj   +1 more source

Reynolds-number effects and anisotropy in transverse-jet mixing [PDF]

, 2006
Experiments are described which measured concentration fields in liquid-phase strong transverse jets over the Reynolds-number range 1.0×10^3 ≤ Rej ≤ 20×10^3. Laser-induced-fluorescence measurements were made of the jet-fluid-concentration fields at a jet-
Dimotakis, Paul E., Shan, Jerry W.
core   +1 more source

Frozen by Heating: Temperature Controlled Dynamic States in Droplet Microswimmers

Advanced Materials, EarlyView.
In the design of smart materials based on active agents or microswimmers, the gaits or motile states of the agents are to be controlled, preferably by external parameters that do not require modifying the composition of the system. A facile, universal parameter is temperature.
Prashanth Ramesh, Yibo Chen, Petra Räder, Svenja Morsbach, Maziyar Jalaal, Corinna C. Maass   +5 more
wiley   +1 more source

Fluid Elasticity Can Enable Propulsion at Low Reynolds Number [PDF]

, 2012
Conventionally, a microscopic particle that performs a reciprocal stroke cannot move through its environment. This is because at small scales, the response of simple Newtonian fluids is purely viscous and flows are time-reversible.
Bird R., Mike Garcia, Nathan C. Keim, Ottino J., Paulo E. Arratia   +4 more
core   +4 more sources

Acoustic mixing at low Reynold’s numbers [PDF]

Applied Physics Letters, 2006
In microfluidic devices, hydrodynamic flow is usually governed by very low Reynold’s numbers. Under these conditions, only laminar flow is possible. Hence, mixing in microfluidics occurs by diffusion only. Interaction of small fluid volumes and acoustic waves in a solid leads to pronounced streaming effects in the fluid inducing mixing and stirring ...
Sritharan, K., Strobl, C. J., Schneider, M. F., Wixforth, Achim, Guttenberg, Z.   +4 more
openaire   +2 more sources

Alignment, Rising, Sticking, and Phototaxis: Modulating the Behavior of Hematite Micropeanuts

Advanced Materials Interfaces, EarlyView.
Although a rich variety of behaviors, such as rising and phototaxis, are observed with light‐activated semiconductor microparticles, the experimental conditions under which such behaviors occur have not been elucidated. In this study, pH, fuel concentration, and light intensity are varied, revealing diverse behaviors of hematite microparticles.
David P. Rivas, Zameer Hussain Shah, Henry Shum, Sambeeta Das   +3 more
wiley   +1 more source

Bayesian Self‐Optimization for Telescoped Continuous Flow Synthesis

Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023
An autonomous continuous flow platform for the rapid development of multistep synthetic pathways is reported. New multipoint sampling and Bayesian optimization techniques were combined, enabling simultaneous identification of optimum reaction conditions within a pharmaceutical process. The short optimization times achieved are promising for development
Adam D. Clayton, Edward O. Pyzer‐Knapp, Mark Purdie, Martin F. Jones, Alexandre Barthelme, John Pavey, Nikil Kapur, Thomas W. Chamberlain, A. John Blacker, Richard A. Bourne   +9 more
wiley   +1 more source

Flow characteristics over NACA4412 airfoil at low Reynolds number

EPJ Web of Conferences, 2016
In this study, the flow phenomena over NACA4412 were experimentally observed at various angle of attack and Reynolds number of 25000, 50000 and 75000, respectively.
Genç Mustafa Serdar, Koca Kemal, Açıkel Halil Hakan, Özkan Gökhan, Kırış Mehmet Sadık, Yıldız Rahime   +5 more
doaj   +1 more source