Research on rotary nozzle structure and flow field of the spinneret for centrifugal spinning

2021 ◽  
pp. 50832
Author(s):  
Zilong Lai ◽  
Jiawei Wang ◽  
Kang Liu ◽  
Wenhui Li ◽  
Zhiming Zhang ◽  
...  
Keyword(s):  
Flow Field ◽  
Centrifugal Spinning ◽  
Nozzle Structure

scholarly journals Exploring the Behavior of a Coherent Flow Field Produced by a Shrouding Laval Nozzle Structure

2020 ◽  
Vol 60 (4) ◽  
pp. 682-690
Author(s):  
Fuhai Liu ◽  
Dongbai Sun ◽  
Rong Zhu ◽  
Shaoyan Hu
Keyword(s):  
Flow Field ◽  
Laval Nozzle ◽  
Nozzle Structure

scholarly journals Numerical Simulation of Flow Field in Air-Jet Loom Main Nozzle

2019 ◽  
Vol 19 (2) ◽  
pp. 181-190
Author(s):  
Shanshan He ◽  
Yi Qian ◽  
Wenliang Xue ◽  
Longdi Cheng
Keyword(s):  
Flow Field ◽  
Negative Pressure ◽  
Fluid Dynamic ◽  
Air Drag ◽  
Zone Length ◽  
Air Jet ◽  
Pressure Zone ◽  
Nozzle Exit Velocity ◽  
Air Jet Loom ◽  
Nozzle Structure

Abstract To improve airflow injection capacity of the main nozzle and decrease backflow phenomenon, a new main nozzle structure with two throats is designed. Negative pressure value and negative pressure zone length are first proposed evaluating the strength of backflow phenomenon. Commercial computational fluid dynamic (CFD) code “Fluent” is performed to simulate the flow field inside and outside the main nozzle. Exit velocity increases about 10 m/s in new main nozzle. Airflow core length of the new main nozzle is 35% higher than that of commonly used main nozzle. Smaller negative pressure value and shorter negative pressure zone length mean a weaker backflow phenomenon in the new main nozzle. Bigger air drag force indicates stronger weft insertion ability in the new main nozzle.

scholarly journals Air velocity distribution of the circumferentially arranged nozzle group

2018 ◽  
Vol 22 (4) ◽  
pp. 1589-1593 ◽  
Author(s):  
Chen-Yang Xu ◽  
Li-Li Wu ◽  
Ting Chen
Keyword(s):  
Flow Field ◽  
Velocity Distribution ◽  
Air Flow ◽  
Hot Wire ◽  
Air Velocity ◽  
Centrifugal Spinning

The air-flow field of the circumferentially arranged nozzle group is modeled and simulated. The air velocity distribution is measured using a hot wire anemometer. The results show that the simulated velocities coincide with the measured ones, confirming the effectiveness of the model. Larger rotating speeds can yield larger air velocities, indicating that introducing auxiliary air is favorable to the polymer drawing in the centrifugal spinning.

Effect of Shrouding Gas Temperature on Characteristics of a Supersonic Jet Flow Field with a Shrouding Laval Nozzle Structure

2018 ◽  
Vol 49 (4) ◽  
pp. 2050-2062 ◽  
Author(s):  
Fuhai Liu ◽  
Dongbai Sun ◽  
Rong Zhu ◽  
Yilin Li
Keyword(s):  
Flow Field ◽  
Laval Nozzle ◽  
Supersonic Jet ◽  
Jet Flow ◽  
Gas Temperature ◽  
Nozzle Structure

The Simulation Application for the Structure Design of the Etcher Nozzle

2012 ◽  
Vol 249-250 ◽  
pp. 372-377
Author(s):  
Lin Sheng
Keyword(s):  
Flow Field ◽  
Plasma Etching ◽  
Etching Rate ◽  
Flow Simulation ◽  
Structure Design ◽  
Structure Parameters ◽  
Simulation Technology ◽  
Field Situation ◽  
Nozzle Structure

With the higher and higher etching rate, the flow field situation of the plasma etching chamber became an important factor to design the etcher chamber structure. This paper studied the etcher nozzle structure in detail by using the flow simulation technology to analyze how to get uniform follow field on the surface of the etching wafer, and then this paper determined the structure parameters of the etcher nozzle.

Numerical Simulation Analysis of Oblique Impinging Jet Flow Field of Different Nozzle Structure

2015 ◽  
Vol 35 (s1) ◽  
pp. s122003
Author(s):  
罗银川 Luo Yinchuan ◽  
芈绍桂 Mi Shaogui ◽  
张蓉竹 Zhang Rongzhu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Simulation Analysis ◽  
Impinging Jet ◽  
Jet Flow ◽  
Nozzle Structure

The Structural Design of Nozzle in Outer Mixing Mode for Preparing Superfine Particles by SCF Technology

2011 ◽  
Vol 236-238 ◽  
pp. 1614-1618
Author(s):  
Yan Liu ◽  
Yan Peng Qu ◽  
Wei Qiang Wang
Keyword(s):  
Flow Field ◽  
Supercritical Fluids ◽  
Structural Design ◽  
Structural Characteristics ◽  
Micro Particles ◽  
Annular Gap ◽  
Fluent Software ◽  
Simulation Results ◽  
Application Fields ◽  
Nozzle Structure

Based on the creative design of nozzle structure, the application fields of the micro-particles production using supercritical fluids (SCF) can be further broaden. According to the analysis of the structural characteristics of the nozzles, a new kind of nozzle with a tunable annular gap is proposed in this research, which includes a cover, movable trays, unmovable trays, seal fittings and connecting components. By virtue of FLUENT software, the flow field of the nozzle in outer mixing mode with two passages is numerically simulated. The effects of the passing length of SCF before mixing and the height of conic convexity on the flow-field are analyzed. The simulation results show that the above length does adverse effect on enhancing mixing extent, however, the smaller height of convexity can help achieve better mixing level. Then the nozzle is redesigned in which a movable tray and an unmovable tray are removed. The improved nozzle has simple and reasonable structure and can do better work on improving gas-liquid mixing extent.

scholarly journals Analysis of Influence of Nozzle Structure on Flow Field in Pulverized Coal Gasifier

2020 ◽  
Vol 768 ◽  
pp. 042045
Author(s):  
Xianbo Gao ◽  
Xiaoguang Yang ◽  
Fei Guo ◽  
Wenbo Lv ◽  
Zhipeng Jiang ◽  
...  
Keyword(s):  
Flow Field ◽  
Pulverized Coal ◽  
Coal Gasifier ◽  
Nozzle Structure

scholarly journals Numerical and Experimental Research on Convergence Angle of Wet Sprayer Nozzle

2018 ◽  
Vol 4 (9) ◽  
pp. 1985 ◽  
Author(s):  
Chang Su ◽  
Yun-hai Cheng
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Flow Field ◽  
Distribution System ◽  
Volume Fraction ◽  
Internal Flow ◽  
Outlet Section ◽  
Validity And Reliability ◽  
Phase Volume Fraction ◽  
Nozzle Structure

Shotcrete is a popular support method in construction of both ground projects and underground projects, such as tunnels, subways, slopes and roadway, etc. However, at present researches on the influence of nozzle structure parameters on the performance of concrete injection are insufficient. This research focuses on the influence of various parameters of nozzle structure on the evenness and dust generating, and conducts a systematic study on the flow characteristics of the concrete in the nozzle of wet spraying machinery and the quality control law, through a comprehensive research method combining theoretical analysis, numerical simulation and field tests. On the basis of dynamic analysis of the internal flow field of the nozzle, the mathematical model and numerical model of the internal flow field of the nozzle are establishes. Then the simulation calculation of the flow field of the wet spray nozzle is conducted with the FLUENT® software. The fluid’s contour about velocity and phase volume fraction in the nozzle were obtained. On this basis this paper analyzed each phase’s volume fraction of the mixed fluid in the outlet section. The convergent section of the nozzle is tested in the spray concrete impact force distribution system. The results are in good correspondence with the results of theoretical analysis and numerical simulation, which verifies the validity and reliability of the conclusion of numerical simulation. This paper provides the basis for the optimization of nozzle structure, and the improvement of the sprayed concrete construction quality.

Exploring the Polymer Drawing of the Air Centrifugal Spinning

2020 ◽  
Vol 13 (3) ◽  
pp. 189-195
Author(s):  
Jia-Jia Liu ◽  
Ting Chen ◽  
Li-Li Wu
Keyword(s):  
Flow Field ◽  
Nozzle Exit ◽  
Field Model ◽  
Rotation Speed ◽  
Air Flow ◽  
Radius Vector ◽  
Air Velocity ◽  
Centrifugal Spinning ◽  
Simulation Results

Background and Objective: The air-flow field of the air centrifugal spinning is simulated and measured. The simulated air velocities coincide well with the measured ones, confirming the correctness of the air-flow field model. Methods: The polymer drawing in the air-flow field of the air centrifugal spinning is modeled and simulated. Effects of the rotation speed and initial air velocity on the diameter and radius vector of the threadline are investigated. Results: The air velocity is found to decrease with the increase of the distance away from the nozzle exit. Simulation results show that both larger rotation speed and higher initial air velocity can reduce the threadline diameter. Conclusion: The radius vector of the threadline increases rapidly with the increase of the initial air velocity, which is helpful to reduce the threadline diameter.

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