Simulation and Experiment of a Designed Anti-Drift Spray Nozzle

2017 ◽  
Vol 8 (2) ◽  
pp. 837-841
Author(s):  
W. Deng ◽  
C. Zhao ◽  
L. Chen ◽  
R. Zhang
Keyword(s):  
Structural Parameters ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Flow Fields ◽  
Structural Parameter ◽  
Structural Factors ◽  
Simulation And Experiment ◽  
Three Dimensional Models ◽  
Set Up ◽  
The Relationship

This paper reports an investigation of the relationship between spray characteristics and a nozzles’ internal structure to reveal the working mechanism of anti-drift spray nozzles. Three important structural factors were taken into account, the diameter of the inner chamber, the angle of V-shaped slot and the relative kerf depth. Three-dimensional models of the fan nozzles were set up using Solidworks software and the corresponding real nozzles were produced using high-precision 3-D printer. The flow fields inside the nozzles were simulated using the software FLUENT. By comparing the flow fields inside and outside the nozzles under the conditions of the same inner structural parameter, the relationships between spraying flow characteristics and different structural parameters was made clear, and provides a reference for optimal design of anti-drift spray nozzles.

A brief history of the filling simulation of injection moulding

2008 ◽  
Vol 223 (3) ◽  
pp. 711-721 ◽  
Author(s):  
D Cardozo
Keyword(s):  
Computer Simulation ◽  
Injection Moulding ◽  
Three Dimensional ◽  
History Of ◽  
Dimensional Models ◽  
Three Dimensional Models ◽  
Set Up ◽  
Filling Simulation ◽  
Basic Features ◽  
Plastic Parts

Injection moulding is one of the most important manufacturing processes for mass production of complex plastic parts. The quality of injection moulded parts depends not only on the material, shape, and function of the part design, but also on how the material is processed during moulding. Traditional design approaches based on intuition, prior experience, and trial-and-error methodology have been becoming less efficient and effective. With advances in numerical modelling and computer simulation techniques, there have been tremendous efforts made to develop computer simulation tools to facilitate injection moulding design and process set-up. This paper reviews the history of research and development in the filling simulation of injection moulding. The existing models are classified into three categories: one-dimensional models, 2.5D models, and three-dimensional models. The basic features and relative key techniques about these models have been discussed. The techniques of tacking the moving flow front have also been presented. It is then followed by conclusions and discussions of these mentioned models.

scholarly journals THE EVALUATION OF ELECTRICAL IMPEDANCE OF THREE-DIMENSIONAL FRACTAL NETWORKS EMBEDDED IN A CUBE

Fractals ◽  
2017 ◽  
Vol 25 (04) ◽  
pp. 1740005 ◽  
Author(s):  
S. W. TANG ◽  
L. WANG ◽  
R. J. CAI ◽  
X. H. CAI ◽  
Z. HE ◽  
...  
Keyword(s):  
Electrical Impedance ◽  
Solid Phase ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Structural Parameter ◽  
Electrical Networks ◽  
Impedance Response ◽  
Different Types ◽  
Total Impedance ◽  
Fractal Network

This paper presents a preliminary work to evaluate the electrical impedance of three-dimensional pore fractal networks embedded in a cube. The construction and structural parameters of pore and electrical networks are illustrated in detailed. The total impedance response (modulus and phase) of networks is primarily associated with structural parameter of network, pore structure parameter of cube, conductivity of pore and solid phases. The impedance response of cube with the evolution of fractal network is analyzed comprehensively in this work. Besides, the influence of conductivity of pore phase caused by different types of electrolytes, electrical frequencies and conductivity of solid phase on the total impedance response is systematically studied.

Three-dimensional simulation and experimental investigation of three-dimensional printed guiding devices on lattice-apron compact spinning

2020 ◽  
pp. 004051752098258
Author(s):  
Malik YH Saty ◽  
Nicholus Tayari Akankwasa ◽  
Jun Wang
Keyword(s):  
Experimental Investigation ◽  
Air Flow ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Yarn Properties ◽  
3D Printed ◽  
Dimensional Simulation ◽  
Compact Spinning ◽  
Set Up

The compact spinning system with a lattice apron utilizes air-flow dynamics to condense fibers in a bunch and enhance the yarn properties. One of the main challenges with this method is the lack of a comprehensive understanding of the air-flow field's effect in the condensing zone. This work presents a numerical and experimental investigation of the effects of three-dimensional (3D) printed guiding devices on the air-flow characteristics and yarn properties. Firstly, the 3D numerical model of the compact spinning system was set up based on the compact spinning machine geometrical dimensions. Secondly, different 3D prototypes were developed, simulated, and analyzed using computational fluid dynamics based on ANSYS software. The prototypes (A-type, B-type, and C-type), selected according to the simulation results, were then 3D printed to enable further experimental investigation. Air-flow analysis results in the air-suction flume area exhibiting a very high negative pressure, and the centerline zone was characterized by high velocity. Experimental results revealed that the three yarns spun with guiding devices had better strength, hairiness, and evenness than those spun without a guiding device. The model developed can be further improved and utilized for commercial purposes and is anticipated to improve compact spun yarn properties significantly.

Simulation and Experimental Study on the Impact of Breadth of Back Blade on Axial Force Balance

2011 ◽  
Vol 130-134 ◽  
pp. 1568-1572
Author(s):  
Hui Wang ◽  
Jie Gang Mu ◽  
Miao Yin Su ◽  
Shui Hua Zheng ◽  
Jin Jing Zhao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Axial Force ◽  
Three Dimensional ◽  
Force Balance ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship

The paper studies the relationship between axial force and breadth of back blade by numerical simulation and experiment. On the basis of the RNG k-ε turbulence model and technology of compact local grids and regional computing, three dimensional numerical simulations to 100HZ165-250 centrifugal pump with various breadths were carried out. Through comparing and analyzing of the flow field, it can be seen that the axial force reduces with the increase of the back blade breadth. After that, the simulation results were verified by the experimental data got from different test devices, and it shows that the conclusions are reliable.

Experimental and numerical investigation of interactions between above and below ground drainage systems

2013 ◽  
Vol 67 (3) ◽  
pp. 535-542 ◽  
Author(s):  
Slobodan Djordjević ◽  
Adrian J. Saul ◽  
Gavin R. Tabor ◽  
John Blanksby ◽  
Istvan Galambos ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Urban Areas ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Sewer Pipes ◽  
Drainage Systems ◽  
Flow Features ◽  
Below Ground ◽  
Set Up ◽  
Flood Flow

This paper presents the results of the experimental and numerical investigation of interactions between surface flood flow in urban areas and the flow in below ground drainage systems (sewer pipes and manholes). An experimental rig has been set up at the Water Engineering Laboratory at the University of Sheffield. It consists of a full scale gully structure with inlet grating, which connects the 8 m2 surface area with the pipe underneath that can function as an outfall and is also further connected to a tank so that it can come under surcharging conditions and cause outflow from the gully. A three-dimensional CFD (Computational Fluid Dynamics) model has been set up to investigate the hydraulic performance of this type of gully inlet during the interactions between surface flood flow and surcharged pipe flow. Preliminary results show that the numerical model can replicate various complex 3D flow features observed in laboratory conditions. This agreement is overall better in the case of water entering the gully than for the outflow conditions. The influence of the surface transverse slope on flow characteristics has been demonstrated. It is shown that re-circulation zones can form downstream from the gully. The number and size of these zones is influenced by the transverse terrain slope.

Three-Dimensional Structure Trajectory Guiding Scan and Points Cloud Registration

2013 ◽  
Vol 300-301 ◽  
pp. 423-426
Author(s):  
Yong Cai
Keyword(s):  
Point Cloud ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Surface Model ◽  
Visual Measurement ◽  
Local Point ◽  
Inverse Kinematics Problem ◽  
The Relationship ◽  
Measurement Approach

Three-dimensional visual scanning is an advanced non-contact measurement approach that can obtain a complete surface model of object. But, in the method, the local raster point cloud sets calculated must be registered to a whole. To reduce fluctuating errors and increase efficiency, we propose a new method that scanner can be moved around object guided by pre-planning trajectory of the robot. First, considering the structural parameters of the robot, the Inverse Kinematics Problem of each joint rotating function is derived, and the moving trajectory is simulated. Then, the relationship between the distances of controlled motion and data gotten by scanner is analyzed, a transform matrix which registered the local point cloud sets is deduced, the raster data can be normalized to the world coordinate by it. The experimental results show that error of registration is less than 0.09mm. The method is suited to measuring different targets in robot workspace. It can improve the efficiency and flexibility of visual measurement system.

3-D Object Projection Method of Multi-Camera Revolve Batch Rendering

2012 ◽  
Vol 256-259 ◽  
pp. 2894-2897
Author(s):  
Xiao Ming Bai ◽  
Xiao Fang Xie ◽  
Ji Hong Yu
Keyword(s):  
Projection Method ◽  
Recognition Rate ◽  
Three Dimensional ◽  
Random Projection ◽  
Three Dimensional Objects ◽  
Space Projection ◽  
Projection Images ◽  
Three Dimensional Models ◽  
Set Up ◽  
Moving Path

3-D object recognition was different from 2-D one. In order to improve recognition rate, it was necessary to establish a full features base. With object as center, the paper offered a view space projection method of Multi-Camera Revolve Batch Rendering. Firstly, constructed three dimensional models for object, set positions for model and camera of top view. Then by the max panel stick to one of axis angle, copied camera with equal interval. Set up the moving path for hemisphere, and constraint to corresponding camera. In the last, established batch script with output parameters, automatic preservation random projection images for three dimensional objects.

scholarly journals Structure of Recombinant Rabies Virus Nucleoprotein-RNA Complex and Identification of the Phosphoprotein Binding site

2001 ◽  
Vol 75 (1) ◽  
pp. 490-498 ◽  
Author(s):  
Guy Schoehn ◽  
Frédéric Iseni ◽  
Manos Mavrakis ◽  
Danielle Blondel ◽  
Rob W. H. Ruigrok
Keyword(s):  
Electron Microscopy ◽  
Rabies Virus ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Negative Stain ◽  
Resolution Model ◽  
Three Dimensional Models ◽  
Nucleoprotein N ◽  
Rna Complex ◽  
Rna Complexes

ABSTRACT Rabies virus nucleoprotein (N) was produced in insect cells, in which it forms nucleoprotein-RNA (N-RNA) complexes that are biochemically and biophysically indistinguishable from rabies virus N-RNA. We selected recombinant N-RNA complexes that were bound to short insect cellular RNAs which formed small rings containing 9 to 11 N monomers. We also produced recombinant N-RNA rings and viral N-RNA that were treated with trypsin and that had lost the C-terminal quarter of the nucleoprotein. Trypsin-treated N-RNA no longer bound to recombinant rabies virus phosphoprotein (the viral polymerase cofactor), so the presence of the C-terminal part of N is needed for binding of the phosphoprotein. Both intact and trypsin-treated recombinant N-RNA rings were analyzed with cryoelectron microscopy, and three-dimensional models were calculated from single-particle image analysis combined with back projection. Nucleoprotein has a bilobed shape, and each monomer has two sites of interaction with each neighbor. Trypsin treatment cuts off part of one of the lobes without shortening the protein or changing other structural parameters. Using negative-stain electron microscopy, we visualized phosphoprotein bound to the tips of the N-RNA rings, most likely at the site that can be removed by trypsin. Based on the shape of N determined here and on structural parameters derived from electron microscopy on free rabies virus N-RNA and from nucleocapsid in virus, we propose a low-resolution model for rabies virus N-RNA in the virus.

Temperature Analysis of Disc Brake Based on Parameters Fluctuation

2014 ◽  
Vol 875-877 ◽  
pp. 923-928 ◽  
Author(s):  
Yuan Jun Zhao ◽  
Yu Zhang ◽  
Zheng Fei Tang ◽  
Yong Fu Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Heat Convection ◽  
Disc Brake ◽  
Convection Coefficient ◽  
Three Dimensional Models ◽  
Relationship Of ◽  
The Relationship

Based on three-dimensional models of key components, a thermoelastic finite element model of disc brake is established. The results of stress field and temperature distribution are acquired considering the relationship of heat convection coefficient and wheel angular velocity. The effect of heat convection coefficient fluctuation and disc material conductivity fluctuation on the model output is analyzed. The simulation results shows that disc temperature is not sensitive to heat convection coefficient, but sensitive to thermal conductivity. And this model mentioned in this paper is of great significant for building a temperature finite element model with engineering accuracy.

scholarly journals Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology

2018 ◽  
Vol 40 ◽  
pp. 05020 ◽  
Author(s):  
Timo de Ruijsscher ◽  
Suleyman Naqshband ◽  
Ton Hoitink
Keyword(s):  
Three Dimensional ◽  
Laser Scanner ◽  
Flow Characteristics ◽  
Side Channel ◽  
Physical Mechanisms ◽  
Mobile Bed ◽  
First Results ◽  
Acoustic Doppler Velocimetry ◽  
Sill Height ◽  
Set Up

Longitudinal training dams (LTDs) have been built over a length of 10 km in the Dutch River Waal as an alternative to groyne fields, splitting the river in a fairway and a bank-connected side channel in the inner bend. Here, we study the physical mechanisms governing the three-dimensional flow and its effect on local morphology at the flow divide using a mobile bed physical model of an LTD, centred around a side channel intake. In line with previous experiments, polystyrene granules are used as a lightweight sediment that allows to achieve dynamic similarity between the model and the prototype. An Acoustic Doppler Velocimetry (ADV) profiler is used to monitor the flow characteristics, whereas a line laser scanner set-up is used to measure the morphological imprint of the flow near the bifurcation point. To study the dependence of the results on the sill height at the side channel intake, different forms and heights of the sill are used. First results show striking similarities with measurements from the field pilot in the Waal River, as well as larger sedimentation in the side channel for a uniform low sill compared to a downstream increasing sill height.

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