scholarly journals Heat Flux Density Distribution Differences in Four Machining Processes of AlSi7 Block: MQL Drilling, Tapping, Reaming and Dry Milling

Procedia CIRP ◽  
2017 ◽  
Vol 58 ◽  
pp. 61-66 ◽  
Author(s):  
Sangil Han ◽  
Pierre Faverjon ◽  
Frédéric Valiorgue ◽  
Rech Joël
Keyword(s):  
Heat Flux ◽  
Density Distribution ◽  
Flux Density ◽  
Heat Flux Density ◽  
Dry Milling ◽  
Machining Processes ◽  
Flux Density Distribution

Effects of External Transverse Alternating Magnetic Field on the Heat Flux Density Distribution of Atmospheric Pressure Plasma Arc

2010 ◽  
Vol 143-144 ◽  
pp. 1439-1444
Author(s):  
Jian Bing Meng ◽  
Xiao Juan Dong ◽  
Wen Ji Xu
Keyword(s):  
Magnetic Field ◽  
Heat Flux ◽  
Magnetic Flux ◽  
Density Distribution ◽  
Flux Density ◽  
Heat Flux Density ◽  
Alternating Magnetic Field ◽  
Magnetic Flux Density ◽  
Plasma Arc ◽  
Flux Density Distribution

A theoretical analysis was carried out to investigate the characteristics of atmospheric pressure plasma arc injected transverse to a transverse alternating magnetic field and a mathematical model was developed to describe the heat flux density distribution of the plasma arc. The effect of processing parameters, such as flow rate of working gas, arc current, magnetic flux density and the standoff from the nozzle to the workpiece, on the heat flux density distribution of plasma arc were also analyzed. The results show that it is feasible to adjust the heat flux density of the plasma arc by the transverse alternating magnetic field, which can expand the region of plasma arc thermal treatment and flatten the heat flux density upon the workpiece. With the magnetic flux density enhancing, the heat flux density gradient upon the workpiece decreases. Under the same magnetic flux density, the more gas flow rate and arc current, the more heat flux density peak increase. Contrarily, more distance from nozzle outlet to workpiece descends the heat flux density peak.

scholarly journals Effects of Transverse Magnetic Field with Different Alternating Currents on Heat Flux Density Distributions of Plasma Arc

2014 ◽  
Vol 8 (1) ◽  
pp. 387-395 ◽  
Author(s):  
Xiaojuan Dong ◽  
Jianbing Meng ◽  
Xiuting Wei ◽  
Zhanmin Yin
Keyword(s):  
Magnetic Field ◽  
Heat Flux ◽  
Density Distribution ◽  
Flux Density ◽  
Heat Flux Density ◽  
Alternating Current ◽  
Alternating Magnetic Field ◽  
Plasma Arc ◽  
Density Distributions ◽  
Flux Density Distribution

An external transverse-alternating magnetic field with sinusoidal and triangular alternating currents was applied to a combined plasma arc to create a plasma arc for expanding the cross section of arc column and flatting the distributions of arc temperature. Two mathematical models were developed to describe the heat flux density distributions of the combined plasma arc driven by a transverse-alternating magnetic field with sinusoidal and triangular alternating currents. The behavior of plasma arc under the external transverse-alternating magnetic field imposed perpendicular to the plasma current was discussed theoretically and experimentally by changing various parameters such as working gas flux, arc current, magnetic flux density including its wave form and the standoff from the nozzle to the workpiece. The analytical results show that it is feasible to adjust the shape and heat flux density of the combined plasma arc by the transverse- alternating magnetic field, which expands the region of combined plasma arc thermal treatment and uniforms the heat flux density upon the workpiece. Changing the waveform of the alternating current can also control the heat flux density distribution. As well as, calculated heat flux density distributions of combined plasma arc driven by the external transverse-alternating magnetic field show a good agreement with experimental data. The magnetic field with triangular alternating current can flat the heat flux density distribution on the anode rather than sinusoidal one. This approach to flat the heat flux density distribution on the anode surface will give an effective controllability to the combined plasma arc application.

The Probability Distribution Modeling of Surface Heat Flux Density on Metal Material

2013 ◽  
Vol 738 ◽  
pp. 42-45
Author(s):  
Cheng Zhi Yang ◽  
Li Zhou
Keyword(s):  
Heat Flux ◽  
Energy Consumption ◽  
Flux Density ◽  
Surface Heat Flux ◽  
Heat Flux Density ◽  
New Technology ◽  
Surface Heat ◽  
Heating Process ◽  
Metal Material ◽  
Flux Density Distribution

In order to get the energy consumption relationship in the heating process of metal material, the probability and statistics law between the temperature distribution and surface heat flux density of heating metal material is established in this paper. Moreover the surface heat flux density distribution of heating metal material is used to associate with its energy consumption. And it builds a new technology method for saving energy control decisions.

THERMAL BEHAVIOR AND IGNITION OF HIGH-ENERGY MATERIALS CONTAINING B, ALB2, AND TIB2

2020 ◽  
Author(s):  
A. G. Korotkikh ◽  
◽  
V. A. Arkhipov ◽  
I. V. Sorokin ◽  
E. A. Selikhova ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Flux Density ◽  
Ignition Delay ◽  
Delay Time ◽  
Heat Flux Density ◽  
Ignition Delay Time ◽  
High Energy ◽  
Energy Materials ◽  
High Energy Materials

The paper presents the results of ignition and thermal behavior for samples of high-energy materials (HEM) based on ammonium perchlorate (AP) and ammonium nitrate (AN), active binder and powders of Al, B, AlB2, and TiB2. A CO2 laser with a heat flux density range of 90-200 W/cm2 was used for studies of ignition. The activation energy and characteristics of ignition for the HEM samples were determined. Also, the ignition delay time and the surface temperature of the reaction layer during the heating and ignition for the HEM samples were determined. It was found that the complete replacement of micron-sized aluminum powder by amorphous boron in a HEM sample leads to a considerable decrease in the ignition delay time by a factor of 2.2-2.8 at the same heat flux density due to high chemical activity and the difference in the oxidation mechanisms of boron particles. The use of aluminum diboride in a HEM sample allows one to reduce the ignition delay time of a HEM sample by a factor of 1.7-2.2. The quasi-stationary ignition temperature is the same for the AlB2-based and AlB12-based HEM samples.

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