Comment on the article by V. V. Ivanov ?temperature distribution in a toroidal coil heated by electric current? and on the correct solution to the problem

1972 ◽  
Vol 23 (1) ◽  
pp. 913-915
Author(s):  
I. M. Minkov
Keyword(s):  
Temperature Distribution ◽  
Electric Current ◽  
Correct Solution ◽  
Toroidal Coil

scholarly journals Nonlocal Problems Arising in Thermoelectrics

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Jaywan Chung ◽  
Byungki Ryu
Keyword(s):  
Power Generation ◽  
Temperature Distribution ◽  
Electric Current ◽  
Nonlocal Problem ◽  
Thermoelectric Effect ◽  
Nonlocal Problems ◽  
Diffusion Term

We revisit the derivation of a nonlocal problem modelling temperature distribution due to power generation using thermoelectric effect. The problem has nonlocal coefficients in reaction and convection terms rather than diffusion term, which makes the problem more interesting. In this paper, we prove that the nonlocal problem has a unique decreasing solution when electric current induced by the thermoelectric effect is small enough.

Change in temperature distribution by constriction of electric current through contact area

2015 ◽  
Vol 20 (4) ◽  
pp. 337-344
Author(s):  
K. Wakabayashi ◽  
P. Hemthavy ◽  
S. Saito ◽  
K. Takahashi
Keyword(s):  
Temperature Distribution ◽  
Electric Current ◽  
Contact Area

Plastic Flow at the Chip-Tool Interface During Hot Machining

1971 ◽  
Vol 93 (2) ◽  
pp. 437-440 ◽  
Author(s):  
B. Bhattacharyya ◽  
R. F. Scrutton
Keyword(s):  
Temperature Distribution ◽  
Physical Properties ◽  
Electric Current ◽  
Plastic Flow ◽  
Joule Heating ◽  
Plastic Layer ◽  
Hot Machining

The plastic flow of metal adjacent to the chip-tool interface when machining heated workpieces is examined theoretically. It is shown that all metallic workpiece materials possess an optimum machining temperature which is dependent on the physical properties of the material. The temperature distribution in the plastic layer in the presence of an electric current normal to the interface is considered in relation to the general plastic flow of metals accompanied by Joule heating.

scholarly journals Uji Kinerja Alat Penyangrai Kopi Tipe Silinder Menggunakan Band-Heater sebagai Pemanas

2020 ◽  
Vol 4 (4) ◽  
pp. 382-391
Author(s):  
Gamal Abdil Nasir ◽  
Syafriandi Syafriandi ◽  
Mustaqimah Mustaqimah
Keyword(s):  
Temperature Distribution ◽  
Data Collection ◽  
Water Content ◽  
Electric Power ◽  
Electric Current ◽  
Electrical Power ◽  
Coffee Consumption ◽  
Electrical Energy ◽  
Analysis Data ◽  
Heat Element

Abstrak. Konsumsi kopi di Indonesia mengalami kenaikan rata-rata sekitar 3 % setiap tahunnya. Meningkatnya nilai konsumsi kopi menjadi pendorong bagi pelaku pengolahan kopi untuk meningkatkan produksinya. Oleh karena itu penting untuk memiliki alat penyangrai yang dapat meningkatkan kualitas dan kuantitas produksi. Penelitian ini dilakukan pengujian mesin sangrai tipe silinder yang dilengkapi elemen panas (heater) sebagai pemanas dan diharapkan dapat mempercepat proses penyangraian dengan kadar air sangrai yang lebih seragam.Tujuan penelitian adalah untuk mengetahui kinerja mesin sangrai kopi tipe silinder menggunakan elemen panas (heater) untuk penyangraian kopi robusta sebanyak 2 kg/penyangraian.Prosedur penelitian dimulai dengan persiapan alat, pengumpulan data dan analisa data. Pengumpulan data dilakukan dengan metode observasi. Pengamatan dan analisis data meliputi distribusi suhu, kadar air, kuat arus listrik, daya listrik dan kebutuhan energi listrik.Hasil penelitian menunjukan penyangraian dilakukan pada tingkat menengah (medium), nilai distribusi suhu yang dihasilkan berbeda, sesuai jumlah heater yang digunakan. Heater 7, suhu berkisar 70-85 °C dengan kadar air kopi sangrai 2.2 % sementara suhu sangrai 9 Heater, berada di 98.33-114 °C kadar air 1.37 % dengan tingkat kematangan yang relatif beragam. Daya listrik yang diperlukan untuk menjalankan semua elemen panas pada penyangraian dengan 7 heater yaitu 2160.56 watt dengan kuat arus yang diperlukan 9.95 ampere, daya listrik sangrai dengan 9 heater 2726.74 watt arus listrik yang dibutuhkan 12.71 ampere.Test the Performance of Coffee Roasters by Using a Heat Element as a Heat SourceAbstract. Coffee consumption in Indonesia has increased an average of around 3% every year. The increasing value of coffee consumption is driving the coffee processing industry to increase its production. Therefore it is important to have a roaster that can improve the quality and quantity of production. This research is carried out testing a cylindrical type roaster machine equipped with a heating element (heater) as a heater and is expected to accelerate the roasting process with a more uniform roasting water content.The purpose of this study was to determine the performance of a cylindrical type coffee roaster machine using a heat element (heater) for roasting robusta coffee of 2 kg / roasting. The research procedure begins with the preparation of tools, data collection and data analysis. Data collection is done by observation method. Data observations and analyzes include temperature distribution, water content, electric current strength, electric power and electrical energy requirements.The results showed that roasting was done at the medium level (medium), the resulting temperature distribution values were different, according to the number of heaters used. Heater 7, the temperature ranges from 70-85 ° C with 2.2% roasted coffee water content while the temperature of the roasted 9 Heater, is at 98.33-114 ° C the water content is 1.37% with a relatively diverse level of maturity. The electric power needed to run all the heat elements in roasting with 7 heaters is 2160.56 watts with the required strong current of 9.95 amperes, roasted electrical power with 9 heaters 2726.74 watts of electric current required 12.71 amperes.

Finite Element Simulation on Temperature Field Couple under Contact Resistor Thermal and Friction Thermal in Friction and Wear

2011 ◽  
Vol 383-390 ◽  
pp. 2578-2584
Author(s):  
Lin Dong ◽  
Hui Ping Jiang ◽  
He Shun Wang
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Finite Element Simulation ◽  
Electric Current ◽  
Current Velocity ◽  
Normal Force ◽  
Contact Point ◽  
Frictional Pair ◽  
Element Simulation

Based on finite element simulation, the temperature field model for the frictional pair of third rail and collector shoe under the coupling of contact resistor thermal and friction thermal was established. The method of coupling the two kinds of thermal was given in detail, the temperature field was calculated, and the maximum coupled temperature changing under different electric current, velocity, and displacement of the model was studied. The results show that the temperature raising effect of friction thermal and contact resistor thermal is different. In the process of mechanical friction without electric current, the highest temperature is in the contact center line, the temperature distribution expands around the contact zone in descending tendency. But in couple condition, the temperature distribution with electric current expands around the contact point in descending tendency. In the two conditions, the temperature gradients are all becoming smaller. The maximum coupled temperature increases with the increasing of the electric current, and decreases with the increasing of the velocity under the constant displacement and normal force. The maximum coupled temperature increases linearly with the increasing of displacement under constant electric current, velocity and normal force.

Pulsed Electric Current Sintering of Electrical Discharge Machinable Ceramics

2010 ◽  
Vol 62 ◽  
pp. 175-184 ◽  
Author(s):  
Jef Vleugels ◽  
Olivier Malek ◽  
Kim Vanmeensel ◽  
Shui Gen Huang ◽  
Song Lin Ran ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Temperature Distribution ◽  
Electric Current ◽  
Surface Quality ◽  
Electrical Discharge ◽  
Powder Compact ◽  
Electrical Discharge Machining ◽  
Fast Heating ◽  
Pulsed Electric Current ◽  
The Impact

Pulsed electric current sintering allows densifying most ceramics at high heating and cooling rates within very short times at elevated temperature, allowing to minimise grain growth. In order to fully explore the PECS potential, it is beneficial to flow the current through the powder compact by either using conductive powder or a powder compact that becomes conductive during densification. Although in-situ Joule heating of the powder compact allows very fast heating rates, it does not necessarily result in a homogeneous temperature distribution. The influence of the current flow on densification and the impact of electrical conductivity on the temperature distribution during PECS are illustrated. The PECS technology at present is limited to the fabrication of simple geometrical shapes. Electrical Discharge Machining (EDM) on the contrary allows production of complex shapes, providing the ceramic has a minimum electrical conductivity. Although EDM has no mechanical impact, the thermal impact is high and the EDM parameters should be carefully selected in order to optimise surface quality and component strength. During wire-EDM, the fast and rough initial cut has to be followed by a sequence of lower energy finishing cuts to optimise the surface quality. The case studies presented are B4C-TiB2 ceramics and ZrO2-based composites with electrically conductive phase addition.

scholarly journals Electric Current Path and Temperature Distribution for Spark Sintering.

1997 ◽  
Vol 44 (10) ◽  
pp. 974-979 ◽  
Author(s):  
Hisakazu Tomino ◽  
Hiroshi Watanabe ◽  
Yoshihito Kondo
Keyword(s):  
Temperature Distribution ◽  
Electric Current ◽  
Current Path
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