Electrostatic separation motion analysis of machine-harvested cotton and residual film based on CFD

2020 ◽  
Vol 20 (3) ◽  
pp. 771-783
Author(s):  
Hongzhou Zhang ◽  
Qiaohua Wang ◽  
Yong Li ◽  
Yuanjie Liu ◽  
Danping Jia
Keyword(s):  
Electric Field ◽  
Solid Model ◽  
Plastic Film ◽  
Electrostatic Separation ◽  
Processing Efficiency ◽  
Cotton Picker ◽  
Cotton Picking ◽  
Cfd Method ◽  
Electric Field Force ◽  
Field Area

A solid model of electrostatic separation between mechanical cotton harvesting and residual plastic film is established. The mechanized harvesting degree has been improved year by year. 90% of the cotton harvesting has been achieved in the southern Xinjiang reclamation area of Xinjiang Production and Construction Corps. However, there are a lot of impurities in the machine harvesting cotton, and it is difficult to remove them. Machine-picked cotton cleaning is an important part of cotton processing. Its cleaning effect directly affects the processing efficiency and lint quality of cotton. In this paper, a solid model of electrostatic separation between mechanical cotton harvesting and residual plastic film is established. Through CFD method, the particles of mechanical cotton harvesting and residual plastic film fly into the electric field at the speed of 3 m/s, 4 m/s, 5 m/s and 6 m/s respectively, and the movement process of different electric field forces is loaded on the particles, in order to reveal the mechanism of electrostatic separation between mechanical cotton harvesting and residual plastic film. The test results show that with the increase of the speed of cotton picker flying into the electric field area, the shorter the residence time of cotton picker in the electric field area, the electric field force required for the film to be captured by the upper plate will gradually increase; the trajectory of particles in the electric field area has less influence on the airflow, and the inlet airflow velocity is the most important factor affecting the airflow distribution in the box. This study is expected to provide a reference for the application of electrostatic technology in the study of the cleaning process of mechanical cotton picking.

Cotton Picker Picks Roller Motion Simulation and Dynamics Analysis

2010 ◽  
Vol 34-35 ◽  
pp. 1765-1769 ◽  
Author(s):  
Wen Lei Sun ◽  
Xiao Li Li ◽  
Chang Bing Fu
Keyword(s):  
Simulation Model ◽  
Prototype Model ◽  
Dynamics Analysis ◽  
Motion Simulation ◽  
Key Factors ◽  
Road Speed ◽  
Cotton Picker ◽  
Cotton Picking ◽  
Movement Simulation ◽  
Moving Speed

The drum is the process of picking cotton, picking cotton picker cotton picker head of the key device, which controls the seat tube and Abstract Abstract ingot of movement, Abstract spindle picking of cotton is also directly affect the quality and efficiency of key factors. Therefore, by creating a virtual prototype model cotton picker roller, about picking cotton picker principle, and the movement simulation model to arrive at, dynamic model of the external force, the cotton picker spindles moving speed of the Summary Block pipe displacement, velocity and acceleration effects. Then summed up, cotton picker of road speed, picking rate and the net rate of mining.

Radial component of vortex electric field force

2021 ◽  
Vol 11 (1) ◽  
pp. 32-35
Author(s):  
Vasyl Tchaban ◽  
Keyword(s):  
Electric Field ◽  
Equations Of Motion ◽  
Spherical Body ◽  
Radial Component ◽  
Force Interaction ◽  
Finite Speed ◽  
The Third ◽  
Electric Field Force ◽  
Electrically Charged ◽  
Positively Charged

he differential equations of motion of electrically charged bodies in an uneven vortex electric field at all possible range of velocities are obtained in the article. In the force interaction, in addition to the two components – the Coulomb and Lorentz forces – the third component of a hitherto unknown force is involved. This component turned out to play a crucial role in the dynamics of movement. The equations are written in the usual 3D Euclidean space and physical time.This takes into account the finite speed of electric field propagation and the law of electric charge conservation. On this basis, the trajectory of the electron in an uneven electric field generated by a positively charged spherical body is simulated. The equations of motion are written in vector and coordinate forms. A physical interpretation of the obtained mathematical results is given. Examples of simulations are given.

scholarly journals Alternating Current Electrohydrodynamic Printing of Microdroplets

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Gao-Feng Zheng ◽  
Hai-Yan Liu ◽  
Rong Xu ◽  
Xiang Wang ◽  
Juan Liu ◽  
...  
Keyword(s):  
Electric Field ◽  
Process Parameters ◽  
Duty Cycle ◽  
Inkjet Printing ◽  
Alternating Current ◽  
Control Technology ◽  
Supply Rate ◽  
Ac Electric Field ◽  
Electrohydrodynamic Printing ◽  
Electric Field Force

This paper discusses the technology of orderly printing of microdroplets by means of electrohydrodynamic print (EHDP) with alternating current (AC). The AC electric field induces charges to reciprocate in the electrohydrodynamic charged jet and generates periodic alternation of electric field force, which facilitates the breakup of charged jets and injection of microdroplets. Microdroplets with a diameter of 100~300 μm can be printed with a frequency of 5~25 Hz via AC EHDP. Effects of process parameters on the microdroplet injection behaviors were investigated. A higher frequency of applied AC voltage led to a higher deposition frequency, but smaller diameters of printed droplets. Deposition frequency and droplet diameters increased with the increase of duty cycle and solution supply rate. AC pulse voltage has provided a novel way to study the control technology in EHDP, which would accelerate the application of inkjet printing in the field of micro/nanosystem production.

scholarly journals External-Electric-Field-Enhanced Uniformity and Deposition Rate of a TiO2 Film Prepared by the Sparking Process

2018 ◽  
Vol 63 (6) ◽  
pp. 531 ◽  
Author(s):  
W. Thongpan ◽  
T. Kumpika ◽  
E. Kantarak ◽  
A. Panthawan ◽  
P. Pooseekheaw ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Electric Fields ◽  
Deposition Rate ◽  
Tio2 Films ◽  
Dc Voltage ◽  
External Electric Fields ◽  
Deposited Film ◽  
Field Area ◽  
Scanning Electron

We have used an external electric field to increase both the uniformity and deposition rate of TiO2 films. The experiment is carried out by sparking-off titanium wires with a high dc voltage of 1 kV (field Eint = 10 kV/cm) and a limited current of 3 mA. The external electric fields (Eext) of 3, 6, and 9 kV/cm were applied to the sparking system for 1–5 hours. The as-deposited film morphology was characterized by scanning electron microscopy. The results clearly show that the films are only deposited on the external electric field area. Furthermore, the deposition rate of the films increased from 40.7% to 77.8% in the presence of the external electric field of 9 kV/cm. The effects of an external electric field on both the deposition rate and uniformity of films are investigated and described.

Application of needle-free roller spinning technology in nanofibers

2019 ◽  
Vol 50 (6) ◽  
pp. 906-920
Author(s):  
Hao Shi ◽  
Pingfan Ning ◽  
Pingjuan Niu ◽  
Tianbo Lu ◽  
Shan Wang
Keyword(s):  
Surface Tension ◽  
Electric Field ◽  
High Throughput ◽  
Auxiliary Electrode ◽  
Electrospun Nanofiber ◽  
Real World Applications ◽  
Key Factor ◽  
Increase Productivity ◽  
Electric Field Force ◽  
Near Future

Although electrospinning is considered a powerful and generic tool for the preparation of nanofiber webs, several issues still need to be overcome for real-world applications. Most of these problems are caused by needle-based systems, where the key factor influencing successful electrospinning is limited by the low yield of nanofibers prepared by needle-type electrospinning and the balance between the electric field force and the surface tension of the droplets. In order to solve these two issues, we use the roller type electrospinning system to prepare nanofibers. The characteristic of the system is that the roller is made of glass, and the voltage is connected to the liquid bath and the auxiliary electrode is added. We demonstrate that needle-disk electrospinning produces nanofiber with super-high throughput of 15.9 g/h, which is 177 times higher than traditional electrospinning under similar spinning conditions. Not only does it increase productivity, but also it facilitates handling and cleaning work. In addition, the auxiliary electrode can optimize the electric field and reduce the edge effect of the collecting plate. This method should help expand the range of applications for electrospun nanofiber webs in the near future.

An apparatus for electric-field-induced protein crystallization

2007 ◽  
Vol 40 (1) ◽  
pp. 199-201 ◽  
Author(s):  
Muhammad Imran Al-Haq ◽  
Eric Lebrasseur ◽  
Wan-Kyu Choi ◽  
Hidenori Tsuchiya ◽  
Toru Torii ◽  
...  
Keyword(s):  
Electric Field ◽  
Protein Crystallization ◽  
Plastic Film ◽  
Dc Voltage ◽  
New Device ◽  
Set Up

A new device has been fabricated for electric field-induced protein crystallization with the microbatch method. In conjunction with this, a specialized tray using inexpensive plastic film has been developed for economical set-up of the experiments. Crystallization can be conducted using AC or DC voltage.

Sign in / Sign up

Export Citation Format

Share Document