Results 121 to 130 of about 245,469 (326)

Transition to turbulence in ferrofluids

, 2015
It is known that in classical fluids turbulence typically occurs at high Reynolds numbers. But can turbulence occur at low Reynolds numbers? Here we investigate the transition to turbulence in the classic Taylor-Couette system in which the rotating fluids are manufactured ferrofluids with magnetized nanoparticles embedded in liquid carriers.
Altmeyer, Sebastian, Do, Younghae, Lai, Ying-Cheng   +2 more
openaire   +2 more sources

Transition to turbulence in a shear flow

Physical Review E, 1999
We analyze the properties of a 19 dimensional Galerkin approximation to a parallel shear flow. The laminar flow with a sinusoidal shape is stable for all Reynolds numbers Re. For sufficiently large Re additional stationary flows occur; they are all unstable.
Eckhardt, Bruno, Mersmann, Alois
openaire   +3 more sources

Multi‐scale Optimization on Interfacial Evaporative Cooling for Photovoltaic Performance Enhancement

Advanced Science, EarlyView.
This study presents a passive siphon‐driven interfacial evaporative cooling technology for photovoltaics. A multiscale multiphysics model is developed and validated experimentally. Results show that optimizing installation parameters reduces operating temperature by up to 22.3 °C and boosts power efficiency by 8.9%, offering a practical pathway for ...
Fuxiang Li, Haosheng Lin, Zengguang Sui, Yunren Sui, Zhixiong Ding, Wei Wu   +5 more
wiley   +1 more source

Transition mechanisms in hypersonic wind-tunnel nozzles: a methodological approach using global linear stability analysis

Flow
Base-flow computations and stability analyses are performed for a hypersonic wind tunnel nozzle at a Mach number of 6. Isothermal and adiabatic wall boundary conditions are investigated, and moderate stagnation conditions are used to provide ...
Hugo Lemarquand, Mathieu Lugrin, Cédric Content, Clément Caillaud, Sébastien Esquieu, Denis Sipp   +5 more
doaj   +1 more source

Concurrently Achieving 4.6 W/M2 and 120,000 Cyclability Enabled by Extendable Swing Arms in Rotational Triboelectric Nanogenerator

Advanced Science, EarlyView.
A rotational energy harvesting device that successfully reconciles high power density with mechanical durability through a hybrid sliding‐and‐bouncing kinematic mechanism is reported. The success reported in our paper includes addressing a dilemma where enhanced electrical output comes at the cost of increased friction and wear, limiting the practical ...
Yihong Lin, Jiaming Zhou, In‐Yong Suh, Eunjong Kim, Kin Chiu Yip, Dae‐jin Kim, Jang‐Mook Jeong, Young‐Jun Kim, Jinyoung Jeon, Ju‐Hyuck Lee, Yoon‐Hwae Hwang, Sang‐Woo Kim, Dong‐Myeong Shin   +12 more
wiley   +1 more source

Observations of Transition from Imbalanced to Balanced Kinetic Alfvénic Turbulence

The Astrophysical Journal Letters
We report observations of solar wind turbulence derived from measurements by the Parker Solar Probe. Our findings reveal the emergence of finite magnetic helicity within the transition range of the turbulence, aligning with signatures of kinetic Alfvén ...
Jinsong Zhao, Trevor A. Bowen, Stuart D. Bale, Chen Shi, Thierry Dudok de Wit, Nikos Sioulas   +5 more
doaj   +1 more source

Numerical simulation of slot jet impingement heat transfer based on one-equation intermittency transition model

Zhongguo Jianchuan Yanjiu
[Objectives]Since the jet impingement phenomena involves the problems of laminar-turbulence transition process, strong adverse pressure gradient and separated fluid, it is difficult to predict the phenomenon by using the traditional turbulence models ...
Huang Huakun, Zhang Guiyong, Sun Tiezhi, Zong Zhi   +3 more
doaj   +1 more source

Transition to turbulence in plane channel flow [PDF]

A numerical simulation of the final stages of transition to turbulence in plane channel flow is reported. Three dimensional, incompressible Navier-Stokes equations are numerically integrated to obtain the time-evolution of two and three dimensional ...
Biringen, S., Goglia, G. L.
core   +1 more source

Developing Micro/Nanostructured Fluidic Mixing Technology for Biomedical Applications

Advanced Science, EarlyView.
This review critically evaluates how micro/nanostructured mixing technologies are redefining biomedical research. By synergizing fundamental analysis, numerical modeling, structural design, and external field manipulation, these systems attain unprecedented control over mass transport.
Junkai Wang, Hanxu Chen, Yile Fang, Yuanjin Zhao   +3 more
wiley   +1 more source

Transition to turbulence in laminar hypersonic flow [PDF]

Progress in a recently started project aimed at the prediction of transition to turbulence in hypersonic flow is briefly discussed. The prediction of transition to turbulence is a very important issue in the design of space vessels.
Vandervegt, Jaap
core   +1 more source