Heat source distribution, vertical structure, and coating influences on the temperature of operating 0.98 μm laser diodes: Photothermal reflectance measurements

1998 ◽  
Vol 84 (7) ◽  
pp. 3491-3499 ◽  
Author(s):  
L. C. O. Dacal ◽  
A. M. Mansanares ◽  
E. C. da Silva
Keyword(s):  
Heat Source ◽  
Vertical Structure ◽  
Laser Diodes ◽  
Source Distribution ◽  
Heat Source Distribution ◽  
Reflectance Measurements

scholarly journals Assessing Heavy Industrial Heat Source Distribution in China Using Real-Time VIIRS Active Fire/Hotspot Data

2018 ◽  
Vol 10 (12) ◽  
pp. 4419 ◽  
Author(s):  
Caihong Ma ◽  
Jin Yang ◽  
Fu Chen ◽  
Yan Ma ◽  
Jianbo Liu ◽  
...  
Keyword(s):  
Economic Development ◽  
Heat Source ◽  
Infrared Imaging ◽  
Mainland China ◽  
Processing System ◽  
Source Distribution ◽  
Heavy Industry ◽  
Rapid Urbanization ◽  
Active Fire ◽  
Heat Source Distribution

Rapid urbanization and economic development have led to the development of heavy industry and structural re-equalization in mainland China. This has resulted in scattered and disorderly layouts becoming prominent in the region. Furthermore, economic development has exacerbated pressures on regional resources and the environment and has threatened sustainable and coordinated development in the region. The NASA Land Science Investigator Processing System (Land-SIPS) Visible Infrared Imaging Radiometer (VIIRS) 375-m active fire product (VNP14IMG) was selected from the Fire Information for Resource Management System (FIRMS) to study the spatiotemporal patterns of heavy industry development. Furthermore, we employed an improved adaptive K-means algorithm to realize the spatial segmentation of long-order VNP14IMG and constructed heat source objects. Lastly, we used a threshold recognition model to identify heavy industry objects from normal heat source objects. Results suggest that the method is an accurate and effective way to monitor heat sources generated from heavy industry. Moreover, some conclusions about heavy industrial heat source distribution in mainland China at different scales were obtained. Those can be beneficial for policy-makers and heavy industry regulation.

scholarly journals Hydrodynamic and Heat Transfer Study of a Fluidized Bed by Discrete Particle Simulations

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 463
Author(s):  
Lijing Mu ◽  
Kay A. Buist ◽  
J. A. M. Kuipers ◽  
Niels G. Deen
Keyword(s):  
Heat Source ◽  
Fluidized Bed ◽  
Volume Fraction ◽  
Particle Energy ◽  
Source Distribution ◽  
Exothermic Reactions ◽  
Temperature Distributions ◽  
Particle Simulations ◽  
Superficial Gas Velocity ◽  
Heat Source Distribution

A numerical simulation study was carried out to study the combined thermal behavior and hydrodynamics of a pseudo-2D fluidized bed using a computational fluid dynamics–discrete element method (CFD-DEM). To mimic the effect of heterogeneous exothermic reactions, a constant heat source was implemented in the particle energy equation. The effects of superficial gas velocity, bed height and heat source distribution were analyzed with the aid of averaged volume fraction and temperature distributions and velocity profiles. It was found that both the gas superficial velocity and the bed aspect ratio have a profound influence on fluidization behavior and temperature distributions.

Three Dimensional Numerical Simulation of Thermal-Hydraulic Behaviors of CSNS Decoupled Poisoned Hydrogen Moderator With Non-Uniform Heat Source

2016 ◽  
Author(s):  
Jian-Fei Tong ◽  
Jiao-Long Wang ◽  
Hao-Chun Zhang ◽  
Yu Ji ◽  
He-Ping Tan
Keyword(s):  
Heat Source ◽  
Three Dimensional ◽  
Pressure Rise ◽  
Cooling Capacity ◽  
Thermal Design ◽  
Source Distribution ◽  
Ansys Fluent ◽  
Uniform Heat ◽  
Neutron Wavelength ◽  
Heat Source Distribution

The Chinese Spallation Neutron Source (CSNS) is the national major scientific equipment, which will be completed around 2018. The moderator is the core of the CSNS parts, and CSNS uses three types of moderator to meet the requirements of different neutron wavelength and pulse shapes, and the structure and flow field of Decoupled Poisoned Hydrogen Moderator (DPHM) is the most complicated. Currently, Computational Fluid Dynamics (CFD) is the primary tool for thermal design of DPHM to ensure the reliability of calculation result and precision of the engineering requirements. In the current work, three-dimensional simulation of fluid-solid conjugate heat transfer and flow for container pipe, poisoned plate and moderator material were carried out, by compiling corresponding UDF program for ANSYS FLUENT to describe the non-uniform heat source distribution accurately. Thermal-Hydraulic behaviors such as pressure disturbance, pressure rise and temperature distribution cooling capacity are investigated.

scholarly journals Effect of Plate Curvature on Heat Source Distribution in Induction Line Heating for Plate Forming

2020 ◽  
Vol 10 (7) ◽  
pp. 2304
Author(s):  
Lichun Chang ◽  
Yao Zhao ◽  
Hua Yuan ◽  
Xiaocai Hu ◽  
Zhen Yang ◽  
...  
Keyword(s):  
Heat Source ◽  
Heat Generation ◽  
Induction Heating ◽  
Electromagnetic Induction ◽  
Source Distribution ◽  
Heating Process ◽  
Line Heating ◽  
Plate Curvature ◽  
Electromagnetic Induction Heating ◽  
Heat Source Distribution

Line heating is an essential process in the formation of ship hull plates with a complex curvature. Electromagnetic induction heating is widely used in the line heating process. In electromagnetic induction heating, the shape of the coil and the air gap between the inductor and workpiece could influence the heat source distribution. Moreover, in the line heating process, the change of curvature of the plate will cause a change of the air gap of the inductor. Magnetic thermal coupling calculation is an effective method for simulating induction heating. This paper used the finite element method to calculate the distribution of heat sources in different initial plate curvatures and coil widths. The changes in heat source distribution and its laws were investigated. The results show that when the coil width is less than 100 mm, the effect of plate curvature on heat source distribution and strain distribution is not apparent; when the coil width is greater than 100 mm, the plate curvature has a visible effect on the heat generation distribution. In the case of a curvature increasing from 0 to 1 and a coil width equal to 220 mm, the Joule heat generation in the center of the heating area is reduced by up to 21%.

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