scholarly journals Experimental parameter study for passive vortex generators on a 30% thick airfoil

Wind Energy ◽  
2018 ◽  
Vol 21 (9) ◽  
pp. 745-765 ◽  
Author(s):  
Daniel Baldacchino ◽  
Carlos Ferreira ◽  
Delphine De Tavernier ◽  
W.A. Timmer ◽  
G. J. W. van Bussel
Keyword(s):  
Experimental Parameter ◽  
Vortex Generators ◽  
Parameter Study ◽  
Thick Airfoil

Experimental Parameter Study on Synthesis Gas Production by Steam-Oxygen Fluidized Bed Gasification of Sewage Sludge

2021 ◽  
Vol 11 (2) ◽  
pp. 579
Author(s):  
Max Schmid ◽  
Selina Hafner ◽  
Günter Scheffknecht
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Experimental Parameter ◽  
Space Velocity ◽  
Phosphate Fertilizer ◽  
Gas Production ◽  
Raw Material ◽  
Parameter Study ◽  
Syngas Production ◽  
Fuels And Chemicals

The conversion of biogenic residues to fuels and chemicals via gasification and synthesis processes is a promising pathway to replace fossil carbon. In this study, the focus is set on sewage sludge gasification for syngas production. Experiments were carried out in a 20 kW fuel input bubbling fluidized bed facility with steam and oxygen as gasification agent. In-situ produced sewage sludge ash was used as bed material. The sensitivity of the key operation parameters gasifier temperature, oxygen ratio, steam to carbon ratio, and the space velocity on the syngas composition (H2, CO, CO2, CH4, CxHy, H2S, COS, NH3, and tars) was determined. The results show that the produced syngas has high H2 and CO concentrations of up to 0.37 m3 m−3 and 0.18 m3 m−3, respectively, and is thus suitable for synthesis of fuels and chemicals. By adjusting the steam to carbon ratio, the syngas’ H2 to CO ratio can be purposely tailored by the water gas shift reaction for various synthesis products, e.g., synthetic natural gas (H2/CO = 3) or Fischer–Tropsch products (H2/CO = 2). Also, the composition and yields of fly ash and bed ash are presented. Through the gasification process, the cadmium and mercury contents of the bed ash were drastically reduced. The ash is suitable as secondary raw material for phosphorous or phosphate fertilizer production. Overall, a broad database was generated that can be used for process simulation and process design.

Impact of the Electromagnetic Brake Position on the Flow Structure in a Slab Continuous Casting Mold: An Experimental Parameter Study

2019 ◽  
Vol 51 (1) ◽  
pp. 61-78 ◽  
Author(s):  
Dennis Schurmann ◽  
Ivan Glavinić ◽  
Bernd Willers ◽  
Klaus Timmel ◽  
Sven Eckert
Keyword(s):  
Continuous Casting ◽  
Flow Structure ◽  
Experimental Parameter ◽  
Parameter Study ◽  
Continuous Casting Mold ◽  
Electromagnetic Brake ◽  
Casting Mold ◽  
Slab Continuous Casting

Continuous Operating Elastocaloric Heating and Cooling Device: Air Flow Investigation and Experimental Parameter Study

2019 ◽  
Author(s):  
Susanne-Marie Kirsch ◽  
Felix Welsch ◽  
Lukas Ehl ◽  
Nicolas Michaelis ◽  
Paul Motzki ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cooling System ◽  
Air Flow ◽  
Experimental Parameter ◽  
Rotation Frequency ◽  
Coefficient Of Performance ◽  
Large Temperature ◽  
Parameter Study ◽  
Or Efficiency ◽  
Heating And Cooling

Abstract Elastocaloric cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology without global warming potential. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in the material. Accompanied by a small required work input, a high coefficient of performance is achievable. Recently, a fully-functional and illustrative continuous operating elastocaloric fluid cooling system based on SMA is developed and realized, using a novel mechanical concept for individual loading and unloading of multiple SMA wire bundles. The fluid-based heat transfer system is designed for efficient heat exchange between the stationary heat source/sink and the SMA elements, operates without any additional heat transfer medium. Rotation frequency and fluid flow-rate are adjustable during operation, which allows adapting the operation point to power- or efficiency-optimized demands. The versatile placement of the in- and outlets allows different duct lengths and counter-flow or parallel-flow experiments. To investigate the air flow parameters at the in- and outlets, as well as the crossflow between the hot and cold side, a measurement system is developed and integrated. In this contribution, the first measurement results of the output temperatures for inlet air flow variation in combination with different rotation frequencies are presented.

scholarly journals Laser Treatment of Wood Surfaces for Ski Cores: An Experimental Parameter Study

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Alexander Petutschnigg ◽  
Michael Stöckler ◽  
Florian Steinwendner ◽  
Julian Schnepps ◽  
Herwig Gütler ◽  
...  
Keyword(s):  
Experimental Parameter ◽  
Raw Material ◽  
Laser Beams ◽  
Parameter Study ◽  
Laser Beam Intensity ◽  
Color Changes ◽  
Laser Treatments ◽  
The Aesthetic ◽  
The Fourier Transform ◽  
Wood Surfaces

Recently, the production of skis with wooden cores has increased due to changes in customer awareness concerning ecological issues and rising raw material costs for mineral oil resources. The preparation of ski surfaces is one of the main expense factors in the production of skis. Thus, one perspective of the AMER SPORTS CORPORATION is to treat wood surfaces with laser beams to develop new aesthetic possibilities in ski design. This study deals with different laser treatments for samples from various wood species: beech, ash, lime, and spruce. The parameters investigated are laser beam intensity and number of laser points on the surface. To evaluate the aesthetic changes, the CIELab color measurements were applied. Changes in the main wood components were observed by the Fourier transform infrared spectroscopy (FTIR) using an ATR (attenuated total reflectance) unit. The results show that the laser treatments on wood surfaces have an influence on wood color and the chemical composition. Especially the intensity of laser beams affects the color changes in different patterns for the parameters observed. These findings will be useful to develop innovative design possibilities of wood surfaces for ski cores as well as for further product design applications (e.g., mass customization).

Development of a Testing Procedure to Determine the Bond Strength in Joining-by-Forming Processes

2014 ◽  
Vol 966-967 ◽  
pp. 481-488 ◽  
Author(s):  
Alexander Mikloweit ◽  
Markus Bambach ◽  
Michael Pietryga ◽  
Gerhard Hirt
Keyword(s):  
Bond Strength ◽  
Surface Condition ◽  
Pure Aluminum ◽  
Experimental Parameter ◽  
Normal Pressure ◽  
Testing Procedure ◽  
Process Conditions ◽  
Parameter Study ◽  
Forming Process ◽  
Joining By Forming

Roll bonding is a joining-by-forming process, in which two or more metals are permanently joined through pressure and plastic deformation, which causes the creation of a metallic bond. The bond formation is a complex process based on various process conditions in the joining zone, such as strain, normal pressure, temperature, strain rate, shear strain and surface condition. Since an individual variation and analysis of the influencing parameters is usually not possible during the rolling process, a specific experimental setup for the investigation of the joining mechanisms is necessary. In this paper, a testing procedure has been developed to determine the bond strength in joining-by-forming processes. The material combination chosen was AA2024/AA1050 as used in aircraft applications. AA2024 sheets are cladded with pure aluminum to improve the corrosion resistance. The performed experimental parameter study confirms the expected influencing factors and is used to determine parameters of a bonding model, which can be integrated in a finite element simulation.

Experimental parameter study of local morphological changes due to large wood

2020 ◽  
pp. 1616-1619
Author(s):  
Ka. Koll ◽  
B.A. Zaid
Keyword(s):  
Morphological Changes ◽  
Experimental Parameter ◽  
Parameter Study ◽  
Large Wood

scholarly journals Sound radiation of hollow box timber floors under impact excitation: An experimental parameter study

2020 ◽  
Vol 161 ◽  
pp. 107190
Author(s):  
Simone Conta ◽  
Anders Homb
Keyword(s):  
Experimental Parameter ◽  
Sound Radiation ◽  
Impact Excitation ◽  
Parameter Study
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