scholarly journals Micro Channel and Heat Transfer Column Structure Effect on Heat Dissipation Performance of LTCC Microwave Component by Numerical Simulation Analysis

2016 ◽  
Author(s):  
Zhiping Liao ◽  
Zhaohua Wu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Dissipation ◽  
Simulation Analysis ◽  
Structure Effect ◽  
Micro Channel ◽  
Column Structure ◽  
Microwave Component

scholarly journals Study on the Convective Heat Transfer and Fluid Flow of Mini-Channel with High Aspect Ratio of Neutron Production Target

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4020
Author(s):  
Peng Sun ◽  
Yiping Lu ◽  
Jianfei Tong ◽  
Youlian Lu ◽  
Tianjiao Liang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Aspect Ratio ◽  
Optimization Design ◽  
Heat Dissipation ◽  
Neutron Production ◽  
Thermal Design ◽  
Maximum Deviation ◽  
Test Channel ◽  
Production Target

In order to provide a theoretical basis for the thermal design of the neutron production target, flow and heat transfer characteristics are studied by using numerical simulations and experiments. A rectangular mini-channel experimental model consistent with the geometric shape of the heat dissipation structure of neutron production target was established, in which the aspect ratio and gap thickness of the test channel were 53.8:1 and 1.3 mm, respectively. The experimental results indicate that the critical Re of the mini-channel is between 3500 and 4000, and when Re reaches 21,000, Nu can reach 160. The simulation results are in good agreement with the experimental data, and the numerical simulation method can be used for the variable structure optimization design of the target in the later stage. The relationship between the flow pressure drop of the target mini-channel and the aspect ratio and Re is obtained by numerical simulation. The maximum deviation between the correlation and the experimental value is 6%.

Effect of Inclined Angle of Radiator on Natural Convective Heat Dissipation Performance

2019 ◽  
Author(s):  
Tengfei Ma ◽  
Wen Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Coefficient ◽  
Natural Convection ◽  
Heat Dissipation ◽  
Deflection Angle ◽  
Experimental Conditions ◽  
Pin Fin ◽  
Inclined Angle ◽  
Gravity Direction

Abstract The effects of inclined angle on the heat transfer of radiators under natural convection are analyzed with experiment and numerical simulation, there are three radiators with straight fin, oblique fin and pin fin respectively (based on 150 × 150 × 45mm). The numerical simulation could agree with the experiment. The straight fin radiator could provide the best heat dissipation performance under experimental conditions and normal installation angle. The pin fin radiator has the largest heat transfer coefficient, around 7 W/m2·K. The influence of deflection angle is discussed on the heat dissipation capability of the radiator. The heat dissipation of the pin fin radiator is less sensitive to the gravity direction than the straight fin and oblique fin ones.

Numerical simulation of heat transfer in a micro channel heat sinks using nanofluids

2010 ◽  
Vol 47 (4) ◽  
pp. 479-490 ◽  
Author(s):  
E. Farsad ◽  
S. P. Abbasi ◽  
M. S. Zabihi ◽  
J. Sabbaghzadeh
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Sinks ◽  
Micro Channel

Numerical Simulation on Heat Transfer Improvement in Wavy Micro Channel

2021 ◽  
pp. 315-325
Author(s):  
Khursheed Afroz Ansari ◽  
Shahid Raza ◽  
Asif Anwar ◽  
Md. Adil ◽  
Mohsin Ali ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Micro Channel ◽  
Heat Transfer Improvement

Electric Heating Biogas Digester Experimental Research and Numerical Simulation of Fluent

2013 ◽  
Vol 724-725 ◽  
pp. 236-240
Author(s):  
Ling Jia ◽  
Shi Lu Xing ◽  
Rui Tian ◽  
Li Ying Wang ◽  
Song Li
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Balance ◽  
Simulation Analysis ◽  
Electric Heating ◽  
Accurate Method ◽  
Dynamic Boundary Conditions ◽  
Experimental Conditions ◽  
Simulation Process ◽  
Good Agreement

In order to verify the correspondence of numerical simulation and experimental results in the electric heating biogas digester system, an electric heating biogas digester experimentdevice was established, and according to the experimental conditions, software Fluent was used to simulate the process of the heat transfer in the system. Before simulation, analyze theexperimental data through the calculation of heat balance and modify it, then use the modifiedexperimental data, compile UDF to characterize the dynamic boundary conditions, choosestandard turbulence model through the Raleigh number, numerical solving the process. Numericalsimulation results show: simulation process basically reflects the experiment, the simulation dataand experimental data are good agreement, and error within 1%. It is concluded that thenumerical simulation analysis is accurate, method is reliable.

scholarly journals Statistical and Simulation Analysis on Dimple Configurations Performance of Heat Dissipation

2021 ◽  
Vol 86 (2) ◽  
pp. 74-90
Author(s):  
Mohd Shahir Kasim ◽  
Nur Husnina Najeah Husshini ◽  
Raja Izamshah ◽  
Hema Nanthini Ganesan ◽  
Muhamad Ammar Farhan Maula Mohd Azam ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Flow Structure ◽  
Heat Dissipation ◽  
Simulation Analysis ◽  
Air Flow ◽  
Orientation Angle ◽  
Cooling Time ◽  
Cooling Effect ◽  
Staggered Arrangement

This paper presents an investigation on cooling effect and flow structure of the spherical dimple configuration during air flow on the Aluminium surface. It is prominently known that applying dimples profile causes an enhancement in heat transfer over a plain surface. A three level of Box-Behnken response surface methodology was performed to find the correlation between the input and output variables. A total of 17 different combinations of these inputs were performed throughout the experiment. The variable inputs to be investigated namely: dimple diameter of 10 - 14 mm, dimple orientation angle of 60°- 90°, and airflow velocity of 16 - 18 m/s to observe the response on the cooling time. The Aluminium block was heated to 60°C and cooled down by air flow at room temperature. The ANOVA was used to identify the significant effect of each parameter. CFD software was used as a simulation tool to analyze the flow structure and Reynolds number that associate with the heat transfer rate to support the statistical findings. Based on the result, all the input parameters are found to be significantly dominated by air flow velocity. Staggered arrangement dimple profile surface improves cooling effect by 63% over the plain flat surface. The increment in Reynolds number will increase the heat transfer which then shortening the cooling time.

scholarly journals Numerical simulation of heat dissipation of surface mounted permanent magnet synchronous hub motor

2021 ◽  
Vol 25 (6 Part A) ◽  
pp. 4059-4066
Author(s):  
Shuai Leng ◽  
Liqiang Jin
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Permanent Magnet ◽  
High Speed ◽  
Heat Dissipation ◽  
Heat Radiation ◽  
Insulation Material ◽  
Safety Hazard ◽  
Insulation Aging ◽  
Potential Safety

Due to the insulation aging, demagnetization and other problems of the permanent magnet and insulating material in the permanent magnet synchronous hub motor under high temperature, the numerical simulation of the heat dissipation of surface mounted permanent magnet synchronous hub motor is proposed. According to the heat transfer of hub motor, the effect degree of heat conduction, heat convection and heat radiation is obtained, the heat transfer coefficient of each part is calculated, and the influence of motor insulation material on temperature rise is analyzed. The experimental results show that the heat dissipation of hub motor under natural cooling condition is poor, and the internal oil cooling method can effectively improve the heat dissipation of hub motor and reduce the temperature difference. When operating at high speed, this reduces the potential safety hazard.

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