Recommendations for metric basic sizes for metal wire

Heat transfer enhancement techniques used in liquid piston gas compression can contribute to improving the efficiency of compressed air energy storage systems by achieving a near-isothermal compression process. This work examines the effectiveness of a simultaneous use of two proven heat transfer enhancement techniques, metal wire mesh inserts and spray injection methods, in liquid piston gas compression. By varying the dimension of the inserts and the pressure of the spray, a comparative study was performed to explore the plausibility of additional improvement. The addition of an insert can help abating the temperature rise when the insert does not take much space or when the spray flowrate is low. At higher pressure, however, the addition of spacious inserts can lead to less efficient temperature abatement. This is because inserts can distract the free-fall of droplets and hinder their speed. In order to analytically account for the compromised cooling effects of droplets, Reynolds number, Nusselt number, and heat transfer coefficients of droplets are estimated under the test conditions. Reynolds number of a free-falling droplet can be more than 1000 times that of a stationary droplet, which results in 3.95 to 4.22 times differences in heat transfer coefficients.

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Influence of a closed-loop controlled laser metal wire deposition process of S Al 5356 on the quality of manufactured parts before and after subsequent machining

Production Engineering ◽

10.1007/s11740-021-01030-w ◽

2021 ◽

Author(s):

Dina Becker ◽

Steffen Boley ◽

Rocco Eisseler ◽

Thomas Stehle ◽

Hans-Christian Möhring ◽

...

Keyword(s):

Wall Thickness ◽

Closed Loop ◽

Deposition Process ◽

Metal Wire ◽

Machining Process ◽

Machining Processes ◽

Initial State ◽

Additive Process ◽

Shape Accuracy ◽

Loop Control

AbstractThis paper describes the interdependence of additive and subtractive manufacturing processes using the production of test components made from S Al 5356. To achieve the best possible part accuracy and a preferably small wall thickness already within the additive process, a closed loop process control was developed and applied. Subsequent machining processes were nonetheless required to give the components their final shape, but the amount of material in need of removal was minimised. The effort of minimising material removal strongly depended on the initial state of the component (wall thickness, wall thickness constancy, microstructure of the material and others) which was determined by the additive process. For this reason, knowledge of the correlations between generative parameters and component properties, as well as of the interdependency between the additive process and the subsequent machining process to tune the former to the latter was essential. To ascertain this behaviour, a suitable test part was designed to perform both additive processes using laser metal wire deposition with a closed loop control of the track height and subtractive processes using external and internal longitudinal turning with varied parameters. The so manufactured test parts were then used to qualify the material deposition and turning process by criteria like shape accuracy and surface quality.

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Effect of Filler Metal Type on Microstructure and Mechanical Properties of Fabricated NiAl Bronze Alloy Using Wire Arc Additive Manufacturing System

Metals ◽

10.3390/met11030513 ◽

2021 ◽

Vol 11 (3) ◽

pp. 513

Author(s):

Jae Won Kim ◽

Jae-Deuk Kim ◽

Jooyoung Cheon ◽

Changwook Ji

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Additive Manufacturing ◽

Filler Metal ◽

Gas Metal Arc Welding ◽

Metal Wire ◽

Cold Metal Transfer ◽

Metal Type ◽

Cold Metal ◽

Wire Arc Additive Manufacturing

This study observed the effect of filler metal type on mechanical properties of NAB (NiAl-bronze) material fabricated using wire arc additive manufacturing (WAAM) technology. The selection of filler metal type is must consider the field condition, mechanical properties required by customers, and economics. This study analyzed the bead shape for representative two kind of filler metal types use to maintenance and fabricated a two-dimensional bulk NAB material. The cold metal transfer (CMT) mode of gas metal arc welding (GMAW) was used. For a comparison of mechanical properties, the study obtained three specimens per welding direction from the fabricated bulk NAB material. In the tensile test, the NAB material deposited using filler metal wire A showed higher tensile strength and lower elongation (approx. +71 MPa yield strength, +107.1 MPa ultimate tensile strength, −12.4% elongation) than that deposited with filler metal wire B. The reason is that, a mixture of tangled fine α platelets and dense lamellar eutectoid α + κIII structure with β´ phases was observed in the wall made with filler metal wire A. On the other hand, the wall made with filler metal wire B was dominated by coarse α phases and lamellar eutectoid α + κIII structure in between.

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Embedded metal-wire nanograting and its application in an optical polarization beam splitter/combiner

Applied Optics ◽

10.1364/ao.47.000312 ◽

2008 ◽

Vol 47 (3) ◽

pp. 312 ◽

Cited By ~ 6

Author(s):

Dingli Wang ◽

Wen Liu ◽

Qingming Xiao ◽

Jing Shi

Keyword(s):

Beam Splitter ◽

Metal Wire ◽

Polarization Beam Splitter ◽

Optical Polarization

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Subwavelength Microwave Guiding by a Periodically Corrugated Metal Wire

Journal of Electromagnetic Waves and Applications ◽

10.1163/156939309787604616 ◽

2009 ◽

Vol 23 (1) ◽

pp. 11-19 ◽

Cited By ~ 16

Author(s):

J.-J. Wu ◽

T.-J. Yang ◽

L. F. Shen

Keyword(s):

Metal Wire ◽

Corrugated Metal

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