Numerical simulation with LBM of the cooling of electronic component: Effect of the inclination angle

2020 ◽  
Vol 30 ◽  
pp. 838-841
Author(s):  
E.M. Berra ◽  
M. Faraji ◽  
H. Faraji
Keyword(s):  
Numerical Simulation ◽  
Inclination Angle ◽  
Electronic Component

Numerical Simulation of Heat Transfer Enhanced Tube Inserted Delta-Wing

2014 ◽  
Vol 535 ◽  
pp. 66-70
Author(s):  
Chen Hong Zhao ◽  
Yong Gang Lei
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Inclination Angle ◽  
Delta Wing ◽  
Delta Wings ◽  
Enhanced Tube ◽  
Delta Winglet

Heat transfer and resistance characteristics of a tube inserted delta-winglet (inclination angle is 10 °) are studied by numerical simulation. The results show that the delta-winglet enhance the heat transfer of the enhancement tube inserted delta-winglet and improve the PEC with modest pressure drop penalties. Compared with based tubes, the delta-wings structure enhance the heat transfer 19.52%-31%.

Numerical Simulation and Experimental Research on Crack Magnetic Flux Leakage Field

2011 ◽  
Author(s):  
Fujun Liu ◽  
Mulin Zheng ◽  
Shuai Kong ◽  
Zhangwei Ling ◽  
Yueqiang Qian
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Experimental Research ◽  
Inclination Angle ◽  
Three Dimensional ◽  
Magnetic Flux Leakage ◽  
Experimental Investigations ◽  
Leakage Field ◽  
Three Dimensional Models ◽  
Flux Leakage

Magnetic flux leakage (MFL) testing is widely used to inspect and characterize defects in pipelines, storage tanks and other structures. In this paper, based on the Maxwell Equations, numerical simulation and experimental research of crack magnetic flux leakage field were carried out. The three-dimensional models of cracks were established, the influence of the generalized crack parameters to the magnetostatic MFL field, including depth, width, inclination angle and crack spacing, was discussed. The relationship between defect parameters and MFL amplitude was obtained. The amplitude is significantly affected by the inclination angle. Therefore, single direction inspection may lead to undetected in practice. While the two cracks interval is less than 5 mm, the MFL fields would overlap. Furthermore, the experimental investigations were developed, and the results agree well with that of the simulation. The conclusions could provide valuable reference for inspection.

scholarly journals Effect of the attack angle of the ribs on the flow and heat transfer in a flat channel

2021 ◽  
Vol 2119 (1) ◽  
pp. 012027
Author(s):  
A V Barsukov ◽  
V V Terekhov ◽  
V I Terekhov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Turbulent Flow ◽  
Inclination Angle ◽  
Attack Angle ◽  
Flat Channel ◽  
Optimal Angle ◽  
Average Heat ◽  
Flow And Heat Transfer

Abstract The results of numerical simulation of a turbulent flow in a flat channel with periodic inclined ribs by the RANS method are presented. The Reynolds number, calculated from the rib height and the superficial velocity, is Re = 12600. The obtained data are analyzed in order to determine the influence of the inclination angle on heat transfer. It is shown that the optimal angle of inclination, at which the average heat transfer in the channel is maximum, is 60°.

Improvement of curving performance by expansion of gauge widening and additional measures

2011 ◽  
Vol 226 (2) ◽  
pp. 203-215 ◽  
Author(s):  
M Adachi ◽  
A Matsumoto
Keyword(s):  
Numerical Simulation ◽  
Inclination Angle ◽  
Lateral Force ◽  
Rolling Stock ◽  
Running Performance ◽  
Rail Corrugation ◽  
Lateral Forces ◽  
Curving Performance ◽  
Track Irregularity ◽  
Squeal Noise

Lateral forces between wheels and rails must be reduced in order that rolling stock runs safely and smoothly on curved tracks. The excessive lateral force will cause not only derailment of rolling stock but also destruction of tracks, rail corrugation, track irregularity, squeal noise and wear. It is important to reduce lateral force of wheels in curves, so new wheel-tread profiles and steerable bogie structures have been developed up to now, however, they cannot solve various problems in curving perfectly. In this article, the authors propose three methods for improvement of running performance on curves by using existing types of wheels and rails, and analyse the effects of three methods by numerical simulation. According to analytical results, the authors conclude that ‘expansion of gauge widening’, and ‘larger rail inclination angle of inner rail installation’ or ‘asymmetrically inclined grinding of inner rail head’ can get sufficient rolling radius difference, and are effective for improvement of running performance on curved tracks.

scholarly journals Parallel Offset Crack Interactions in Rock under Unloading Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Zihan Zhou ◽  
Zhonghui Chen
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Inclination Angle ◽  
Shear Failure ◽  
Superposition Principle ◽  
Interaction Strength ◽  
Jointed Rock ◽  
Interaction Coefficient ◽  
Open Pit ◽  
Type I

Rock slopes contain numerous nonpenetrating intermittent joints which maintain stability under excavation disturbance. The tip interaction coefficient (IC) of parallel offset double cracks in a typical rock mass under unloading conditions was calculated in this study based on the superposition principle and fracture mechanics to determine the meso-influence law of intermittent joint interaction in the slope under the action of excavation. The influence of many factors on the said interaction was also analyzed theoretically. Lateral unloading tests were conducted on rock-like specimens with parallel offset cracks in addition to RFPA2D numerical simulation and theoretical analysis. The results show that a smaller length of rock bridge or staggered distance between the cracks results in more severe and sensitive interactions at the crack tip. The Type I interaction strength of the tip of the crack is not affected by the inclination angle of the crack, but shear failure gradually weakens as the angle changes. The shear failure of the tip of the crack is more sensitive to changes in the inclination angle when the cracks are closer to each other; the change is the most intense when α is about 60°. Lateral unloading test and RFPA2D numerical simulation results are in close agreement with the theoretical analysis, which validates the theoretical results. The current study shows the interaction of the parallel offset cracks in rock under unloading conditions and is conducive to the study of the meso-failure mechanism of the jointed rock slope in an open-pit mine under the action of excavation.

Study on the Process Optimization of Fully-Mechanized Hard Top-Coal Caving with Large Inclination Angle

2014 ◽  
Vol 889-890 ◽  
pp. 234-240
Author(s):  
Yong Zhang ◽  
Jin Kai Liu ◽  
Qi Li ◽  
Jian Jian Zhao ◽  
Yue Ma
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Inclination Angle ◽  
Recovery Rate ◽  
Element Model ◽  
Simulation Software ◽  
Industrial Experiment ◽  
Working Face ◽  
Geological Conditions ◽  
Technological Achievement

In order to solve the problem of low recovery rate of top-coal during fully-mechanized coal caving with large inclination angle, the optimization of fully-mechanized hard top-coal caving with large inclination angle is studied in this paper respectively in the two aspects of changing caving characteristics of top-coal and caving process. By adopting the method of top-coal pre-blasting to weaken top-coal, the caving characteristics is effectively improved which creates conditions for the successful caving of top-coal; meanwhile, the statistical result of recovery rate of top-coal is obtained by using numerical simulation software PFC2D based on particle element model, it is found that coal loss during top-coal caving and the loss at the ends of working face is effectively reduced when 2 cuttings and 1 caving method with multi-round spaced drawing is taken, which significantly improved the recovery rate of top-coal and it has passed the field test of industrial experiment. This technological achievement could provide some reference to the fully mechanized working face in this coal mine or working faces under similar geological conditions.

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