Results 141 to 150 of about 4,765,914 (397)

Untethered Magnetic Microswimmers for Targeted Particle Transport and Flow Manipulation

Advanced Materials Technologies, EarlyView.
This work introduces magnetically actuated microswimmers to dynamically reconfigure fluid flow within a single microfluidic device. Multiple homogeneous microswimmers are independently controlled by an external magnetic field to perform translational and rotational motions, thereby inducing real‐time flow manipulation.
Dineshkumar Loganathan, Dong‐Ming He, Kai‐Wei Chen, Chia‐Yuan Chen   +3 more
wiley   +1 more source

Analysis of Surface Drag Reduction Characteristics of Non-Smooth Jet Coupled Structures

Lubricants
To enhance the service life of shipping equipment and minimize surface wear, this study employs biomimetic principles, integrating fitted structures with jet dynamics to model three configurations: non-smooth structures, single jet structures, and non ...
Jinming Kou, Qiannan Lou, Yunqing Gu, Junjun Zhang, Chengqi Mou, Jiayun Yu, Youting Ding, Chengbo Xu   +7 more
doaj   +1 more source

Multiscale Acoustic Bubble Actuators Using Bioinspired Liquid‐Repellent Microstructures

Advanced Materials Technologies, EarlyView.
The article presents multiscale acoustic bubble actuators using bioinspired liquid‐repellent microstructures, enabling programmable trapping, pumping, mixing, and precise flow control. Mimicking springtail microstructures, these scalable actuators (200 µm–1 mm) offer multifunctionality in all‐in‐one devices, letter‐shaped arrays, and 3D cube ...
Cem Balda Dayan, Nima Mahkam, Nihal Olcay Dogan, Ville Liimatainen, Defne Hiz, Aleyna Ilgezdi, Daniel Razansky, Amirreza Aghakhani, Metin Sitti   +8 more
wiley   +1 more source

Investigation into Shock Control and Drag Reduction Characteristics of Opposing Plasma Synthetic Jet in Mach 8 Flow

Aerospace
Plasma synthetic jet (PSJ) is widely employed in flow control due to its advantages of zero-mass and fast-response. A novel measurement method for high-frequency dynamic drag variation was adopted in a Mach 8 wind tunnel experiment, demonstrating that ...
Xudong Zhang, Hao Dong, Xingyu Cao, Yan Zhou, Wei Xie, Wei Song, Yan Wang   +6 more
doaj   +1 more source

Shell Model for Drag Reduction with Polymer Additive in Homogeneous Turbulence

, 2003
Recent direct numerical simulations of the FENE-P model of non-Newtonian hydrodynamics revealed that the phenomenon of drag reduction by polymer additives exists (albeit in reduced form) also in homogeneous turbulence.
C.D. Dimitropoulos, E. Balkovsky, E. de Angelis, E.S.C. Ching, Elisabetta De Angelis, Itamar Procaccia, J.L. Lumley, J.M.J. de Toonder, K.R. Sreeinvasan, P. Giuliani, P.S. Virk, Rama Govindarajan, Roberto Benzi, T.S. Luchik, V.S. L’vov   +14 more
core   +1 more source

Development of Heat Engines Powered by Twisted and Coiled Polymer Fiber Actuators

Advanced Materials Technologies, EarlyView.
Continuously rotating engines driven by thermally responsive actuating materials can turn waste heat into useful energy. For the first time heat engines operated by twisted and coiled polymer fiber actuators are demonstrated with engine design guided by two simple analytical models.
Geoffrey M. Spinks, Burhan Bin Asghar Abbasi, Zhen Jiang   +2 more
wiley   +1 more source

Parameters of Drag Reducing Polymers and Drag Reduction Performance in Single-Phase Water Flow

Advances in Mechanical Engineering, 2014
This study presents experimental investigation about the effect of polymer parameters on the performance of the drag reducing polymers in single-phase water flowing in a horizontal pipe of 30.6 mm ID.
A. Abubakar, A. R. Al-Hashmi, T. Al-Wahaibi, Y. Al-Wahaibi, A. Al-Ajmi, M. Eshrati   +5 more
doaj   +1 more source

Drag Reduction Obtained by the Addition of a Boattail to a Box Shaped Vehicle [PDF]

Coast down tests were performed on a box shaped ground vehicle used to simulate the aerodynamic drag of high volume transports such as delivery vans, motor homes and trucks.
Peterson, R. L.
core   +1 more source

Temperature‐Dependent Zinc Oxide Cathodoluminescence: Toward Compact Wavelength‐Tunable Solid‐State Photoionization Sources

Advanced Optical Materials, EarlyView.
A proof‐of‐concept of a thermally‐tunable cathodoluminescence‐based light source is demonstrated using a wide‐bandgap z‐cut ZnO crystal as anode, resulting in the ultraviolet (UV) emission peak shifting from 398 nm to ~409 nm (3.115‐3.032 eV). Our results establish the feasibility of a compact, field‐deployable UV source with potential for gas sensing ...
Rui M. R. Pinto, Aritz Retolaza, João Cunha, Pedro Matos, Júlio Silva, Diana Silva, Rosana Alves Dias, K. B. Vinayakumar   +7 more
wiley   +1 more source

Experimental study of delta wing leading-edge devices for drag reduction at high lift [PDF]

The drag reduction devices selected for evaluation were the fence, slot, pylon-type vortex generator, and sharp leading-edge extension. These devices were tested on a 60 degree flatplate delta (with blunt leading edges) in the Langley Research Center 7 ...
Johnson, T. D., Jr., Rao, D. M.
core   +1 more source