Hydrodynamics behaviour study of a Dual piezoelectric Cool Jet (DCJ) system on the thermal cooling of electronic casings

2017 ◽  
Author(s):  
Claudia Cadile ◽  
Andreas Rumpf ◽  
Dominique Elzo ◽  
Jean-Pierre Fradin
Keyword(s):  
Behaviour Study ◽  
Thermal Cooling

Efficient Thermal Cooling Structure for a Motor

2016 ◽  
Vol 136 (6) ◽  
pp. 385-391 ◽  
Author(s):  
Tuyoshi Nonaka ◽  
Shogo Makino ◽  
Motomichi Ohto
Keyword(s):  
Thermal Cooling

Studi kinerja cooling tower unit amoniak dan urea pada sistem utilitas industri petrokimia

2020 ◽  
Vol 26 (1) ◽  
pp. 37-41
Author(s):  
Enggal Nurisman ◽  
Zulfa Syafira ◽  
Fatina Shania
Keyword(s):  
Cooling Tower ◽  
Thermal Cooling

Setiap industri petrokimia memerlukan kebutuhan steam dan air sebagai unit penunjang prosesnya. Untuk meningkatkan efisiensi penggunaan air dalam sistem utilitas diperlukan cooling tower sehingga air pendingin dapat digunakan kembali  selama proses berlangsung. Penggunaan cooling tower dalam industri dinilai penting, sehingga perlu peninjauan mengenai evaluasi kinerja cooling tower. Evaluasi kinerja cooling tower dilakukan berdasarkan perhitungan  jumlah losses, neraca massa dan neraca panas, efisiensi termal, serta efisiensi kerja untuk mengetahui kondisi dan kinerja dari cooling tower dalam proses pendinginan. Hal ini dapat menjadi pertimbangan teknis  pihak industri untuk operasional maupun perawatan lebih lanjut. Setelah melalui pengamatan di lapangan, diperoleh hasil perhitungan aktual yang menunjukkan efisiensi thermal cooling tower pada unit amoniak dan urea berkisar antara 74%-78,70%. dan masih sesuai dengan  efisiensi termal secara desain  sebesar 74 % dan 75,82 %. Sedangkan efisiensi kerja cooling tower unit amoniak maupun unit urea berdasarkan data aktualnya, yaitu berkisar 71,429%-83,537% dan sesuai dengan data desainnya yaitu 71,4 %. Berdasarkan hasil perhitungan tersebut, kinerja cooling tower masih beroperasi dengan baik dan masih layak digunakan dalam proses industri

scholarly journals Classification Techniques for Behaviour study of Autism spectrum Disorder

2021 ◽  
Vol 1964 (3) ◽  
pp. 032008
Author(s):  
U Vignesh ◽  
K G Suma ◽  
R Elakya ◽  
C Vinothini ◽  
A M Senthil Kumar
Keyword(s):  
Autism Spectrum Disorder ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Classification Techniques ◽  
Behaviour Study

scholarly journals Ce-Bearing FeSi Alloy Inoculation of Electrically Melted, Low Sulphur Grey Cast Irons for Thin Wall Castings

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1122
Author(s):  
Irina Varvara Balkan ◽  
Iulian Riposan
Keyword(s):  
Wall Thickness ◽  
Structural Characteristics ◽  
Cooling Curve ◽  
Thin Wall ◽  
Cast Irons ◽  
Iron Castings ◽  
Grey Cast ◽  
The Difference ◽  
Thermal Cooling ◽  
Fesi Alloy

Electrically melted and over-heated (>1500 °C) grey cast iron at less than 0.04%S, as commonly used, solidifies large amounts of carbides and/or undercooled graphite, especially in thin wall castings; this is necessary to achieve a stronger inoculation. The efficiency of Ce-bearing FeSi alloy is tested for lower ladle addition rates (0.15 and 0.25 wt.%), compared to the base and conventional inoculated iron (Ba,Ca-bearing FeSi alloy). The present work explores chill and associated structures in hypoeutectic grey iron (3.6–3.8%CE, 0.02%S, (%Mn) × (%S) = 0.013–0.016, Alres < 0.002%), in wedge castings W1, W2 and W3 (ASTM A 367, furan resin sand mould), at a lower cooling modulus (1.1–3.5 mm) that is typically used to control the quality of thin wall iron castings. Relatively clear and total chill well correlated with the standard thermal (cooling curve) analysis parameters and structural characteristics in wedge castings, at different wall thickness, displayed as the carbides/graphite ratio and presence of undercooled graphite morphologies. The difference in effects of the two inoculants addition is seen as the ability to decrease the amount of carbides and undercooled graphite, with Ce-bearing FeSi alloy outperforming the conventional inoculant, especially as the wall thickness decreased. It appears that Ce-bearing FeSi alloy could be a solution for low sulphur, electric melt, thin wall iron castings production.

scholarly journals The prevalence of ill-treatment and bullying at work in Ireland

2020 ◽  
Vol 13 (3) ◽  
pp. 245-264
Author(s):  
Victoria Hogan ◽  
Margaret Hodgins ◽  
Duncan Lewis ◽  
Sarah Maccurtain ◽  
Patricia Mannix-McNamara ◽  
...  
Keyword(s):  
Workplace Bullying ◽  
National Level ◽  
Economic Recession ◽  
Survey Study ◽  
National Study ◽  
Content Type ◽  
Level Data ◽  
Irish Data ◽  
Behaviour Study ◽  
National Probability Sample

PurposeThe purpose of this paper is to examine the prevalence of ill-treatment and bullying experienced by Irish workers and to explore individual and organisational predictors. The most recent national figures available are specific to bullying and predate the economic recession; therefore, this study is timely and investigates a broader range of negative behaviours.Design/methodology/approachA questionnaire survey study on a national probability sample of Irish employees was conducted (N = 1,764). The study design replicated the methodology employed in the British workplace behaviour study.FindingsThe results showed that 43% of Irish workers had experienced ill-treatment at work over the past two years, with 9% meeting the criteria for experiencing workplace bullying. A number of individual and organisational factors were found to be significantly associated with the experience of ill-treatment at work.Research limitations/implicationsThis study provides national-level data on workplace ill-treatment and bullying that are directly comparable to British study findings.Practical implicationsThe findings indicate that a significant number of Irish workers experience ill-treatment at work, and that workplace bullying does not appear to have decreased since the last national study was conducted in Ireland.Social implicationsThis study is of use to the Irish regulator and persons responsible for managing workplace bullying cases, as it identifies high-risk work situations and contributing individual factors.Originality/valueThis study provides national Irish data on workplace behaviour and ill-treatment following a severe economic recession.

Simulation of Thermal Cooling Curves in the Process to Ordering Alloys by the Monte Carlo Method

2021 ◽  
Vol 410 ◽  
pp. 227-234
Author(s):  
Albert R. Khalikov ◽  
Sergey V. Dmitriev
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Stoichiometric Composition ◽  
Square Lattice ◽  
Cooling Curves ◽  
Ordering Kinetics ◽  
The Monte Carlo Method ◽  
Proposed Model ◽  
Coordination Spheres ◽  
Thermal Cooling

An algorithm is proposed for constructing curves of thermal cooling and ordering kinetics with a monotonic decrease in temperature for alloys to stoichiometric composition. Modeling is carried out by the Monte Carlo method in the model of a rigid crystal lattice and pair interatomic interactions. The application of the algorithm is illustrated by the example to a square lattice, taking into account interatomic interactions in the first two coordination spheres for alloys with the composition AB, A3B, and A3B5. The proposed model makes it possible to calculate individual sections of the phase diagrams to the state for binary alloys.

FEA of SAW penetration of Ramor 500 steel

2020 ◽  
Vol 62 (12) ◽  
pp. 1192-1198
Author(s):  
Ali Kaya Gur ◽  
Semih Taskaya ◽  
Subramaniam Shankar ◽  
Thangamuthu Mohanraj
Keyword(s):  
Three Dimensional ◽  
Welding Process ◽  
Source Model ◽  
Strength Properties ◽  
Steel Plates ◽  
Constant Current ◽  
Welding Seam ◽  
Depth Increase ◽  
Thermal Cooling ◽  
Submerged Arc

Abstract Ramor 500 steel plates are used as a ballistic material due to their greater hardness and strength properties. This steel can be produced with a 2-30 mm thickness sheet which may attain 505-590 HV hardness. In the present work, Ramor 500 steel pairs are joined using a submerged arc welding (SAW) process and taking various parameters into consideration. An austenitic additional wire is used for the welding process which contains Cr, Ni, and Mn. The source model prototype was developed using ANSYS software and considering a time-dependent three dimensional thermal model with source cooling. The highest tensile stress voltage value was determined in the sample applying a constant current of 250 A, 25 V and 30 cm × min-1welding speed. It was observed that the welding seam width increases as welding tension grows and that welding height and depth increase and decrease more or less in tandem. A ANSYS thermal cooling analysis revealed that welding tension grows with heat transfer which increases 15 mm from the main center of the welding area.

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