Results 101 to 110 of about 265,857 (305)
Drag Reduction of Bacterial Cellulose Suspensions
Advances in Mechanical Engineering, 2011 Drag reduction due to bacterial cellulose suspensions with small environmental loading was investigated. Experiments were carried out by measuring the pressure drop in pipe flow.
Satoshi Ogata +2 more
doaj +1 more source
Degradation Mechanisms in PEM Water Electrolysis: Diagnosis and Impact
Advanced Materials Technologies, EarlyView.This review provides an analysis of degradation mechanisms in proton electrolyte membrane water electrolyzers (PEMWE), focusing on all key components. It discusses diagnostic and measurement techniques for evaluating degradation, less‐studied mechanisms, and an expert survey.
Annik Bernhardt +11 more
wiley +1 more source
Journal of Marine Science and EngineeringUnderwater drag reduction using superhydrophobic surfaces is a promising method due to its simplicity and low energy consumption. However, most attempts to obtain drag reduction using superhydrophobic surfaces have failed.
You Nie, Ding Weng, Jiadao Wang
doaj +1 more source
Journal of Fluid Mechanics, 2008 We use direct numerical simulation to study turbulent drag reduction by rigid polymer additives, referred to as fibres. The simulations agree with experimental data from the literature in terms of friction factor dependence on Reynolds number and fibre concentration.
Gillissen, J.J.J. (author) +3 more
openaire +5 more sources
Dynamic Current Routing in Conductive Liquid Crystal Elastomers for Complex Deformation Actuators
Advanced Materials Technologies, EarlyView.This work introduces a novel actuation control strategy in which electrical stimulation generates localized Joule heating in conductive liquid crystal elastomer (LCE) surfaces, enabling complex 3D deformations from a single homogeneous surface without preprogramming.
Gloria PouWai Lei +2 more
wiley +1 more source
The Effect of Sodium Hydroxide on Drag Reduction using a Biopolymer.
MATEC Web of Conferences, 2014 Drag reduction is observed as reduced frictional pressure losses under turbulent flow conditions and hence, substantially increases the flowrate of the fluid.
Singh Harvin Kaur A/P Gurchran +2 more
doaj +1 more source
Cost consideration for aircraft configuration changes, 1 [PDF]
The costs of improvements in aircraft drag reduction design changes are outlined in the context of production decisions. A drag reduction design with increased airframe weight requires cost increases for direct labor, overhead and direct expenses, plus ...
Tumlinson, R. R.
core +1 more source
Changes in turbulent dissipation in a channel flow with oscillating walls
, 2012 Harmonic oscillations of the walls of a turbulent plane channel flow are studied by direct numerical simulations to improve our understanding of the physical mechanism for skin-friction drag reduction. The simulations are carried out at constant pressure
Batchelor +8 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 +2 more
wiley +1 more source
An Experimental Investigation of Helicopter Rotor Hub Fairing Drag Characteristics [PDF]
A study was done in the NASA 14- by 22-Foot Wind Tunnel at Langley Research Center on the parasite drag of different helicopter rotor hub fairings and pylons. Parametric studies of hub-fairing camber and diameter were conducted. The effect of hub fairing/
Lance, M. B. +3 more
core +1 more source