On the Effect of Solid Sphericity on the Tangential Velocity in a Cyclone Separator

2021 ◽  
pp. 1-16
Author(s):  
Kamel A. Elshorbagy ◽  
Yasser El Ashry ◽  
Amr M. Abdelrazek
Keyword(s):  
Tangential Velocity ◽  
Cyclone Separator

Fluid Field Analysis for Cyclone Separator Used on Grain Cleaning

2012 ◽  
Vol 605-607 ◽  
pp. 1369-1371
Author(s):  
Ling Xin Geng ◽  
Li Jian Zhang ◽  
Qing Xiang Shi
Keyword(s):  
Radial Velocity ◽  
Axial Velocity ◽  
Tangential Velocity ◽  
Laser Doppler ◽  
Field Analysis ◽  
Laser Doppler Velocimeter ◽  
Structure Parameters ◽  
Cyclone Separator ◽  
Gas Velocity ◽  
Fluid Field

Gas velocity in cyclone separator is measured by testing with laser Doppler velocimeter in this paper. The measuring results indicates that tangential velocity, axial velocity, radial velocity of air distribute following some certain rules, reasonable selected structure parameters can improve separating efficiency

Theoretical Modeling of the Oil–Gas Cyclone Separator in Oil–Injected Compressor Systems

2012 ◽  
Author(s):  
Xiang Gao ◽  
Yaopeng Zhao ◽  
Jianmei Feng ◽  
Yunfeng Chang ◽  
Xueyuan Peng
Keyword(s):  
Gas Flow ◽  
Droplet Diameter ◽  
Tangential Velocity ◽  
Cyclone Separator ◽  
Droplet Motion ◽  
Oil Droplet ◽  
Flow Equations ◽  
Proposed Model ◽  
Rsm Model ◽  
Oil Gas

This paper presented a simplified theoretical model of gas flow and particle motion in cyclone separator in oil-injected compressor based on the vortex flow equations. The tangential velocity distributions in cyclone separator for the top area and the bottom area have both been deduced by defining a pressure energy coefficient and the minimum oil droplet diameter been completely separated has been determined for variable separators. The separation efficiencies of different diameter oil droplets calculated by proposed model were compared with numerical simulation results using RSM model in gas flow field and DPM in oil droplet motion and the results were acceptable.

Studies on Separation Efficiency and Energy Conservation Through Novel Finned Cyclone Separator

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Mahesh Dasar ◽  
Ranjit S. Patil
Keyword(s):  
Heat Exchanger ◽  
Energy Conservation ◽  
Cross Section ◽  
Separation Efficiency ◽  
Collection Efficiency ◽  
Rectangular Cross Section ◽  
Fluid Dynamic ◽  
Scale Up ◽  
Tangential Velocity ◽  
Cyclone Separator

Abstract In the present study, cylindrical portion of conventional (nonfinned) cyclone separator was reshaped by fixing triangular, semicircular, and rectangular cross section helical fins in order to make it as water wall having fin size 7 mm with fin pitch of 40 mm to improve its separation efficiency and to utilize the cyclone separator as heat exchanger. Fluid dynamic characteristics like axial velocity, tangential velocity, pressure drops were studied by varying the fin geometry (triangular/semicircular/rectangular). For the particles' size less than 3 μm, proposed cyclone separator with triangular helical fin was giving comparatively improved collection efficiency than other selected cyclone separators. Improvement in the collection efficiency of triangular fin-based cyclone separators was perceived from 5% to 10% over the conventional cyclone separator. Hence, helical fins with triangular in cross section were selected further for heat transfer and scale-up studies. It was observed that for the small barrel wall height (h = 400 mm) water temperature was enhanced by 4 °C, and with scale-up (making h = 800 mm) it was increased considerably around 15 °C. Thus based on improved separation efficiency to capture very-fine particulate matter (PM 2.5, which otherwise causes serious health issues) and considerable temperature gain of water noted at lab level scale-up study, triangular helical fins may be to fixed on the inner surface of barrel wall of conventional (nonfinned) cyclone separators in order to use them as heat exchanger for energy conservation in industrial applications.

Numerical simulation of the particle-wall collision strength and swirling effect on the performance of the axial flow cyclone separator

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yanqin Mao ◽  
Wenhao Pu ◽  
Liang Cai ◽  
Chaojie Li ◽  
Xiaoyue Wang ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Tangential Velocity ◽  
Small Diameter ◽  
Axial Flow ◽  
Separation Performance ◽  
Exhaust Pipe ◽  
Normal Velocity ◽  
Cyclone Separator ◽  
Inlet Velocity ◽  
Wall Collision

Abstract The axial cyclone separator has simple structure, operates to reducing dust concentration in grain storehouses, and features low production cost, and convenient installation. Aiming to obtain the separation characteristics of an axial flow guide separator, the particle wall collision and the performance of multi-tubes were simulated with Fluent. The renormalization group (RNG) k − ε model was used to study the turbulent modeling and the user define function (UDF) was used to calculate the particle-wall collision. The simulation and experimental results were compared to verify the computation model. The results showed that the basic feature of the flow pattern remains stable and the separation efficiency of 800 kg/m3 particles is higher than 2650 kg/m3 particles when the inlet velocity increases from 2 to 5 m/s. When the inlet velocity was 5 m/s, the normal velocity restitution ratio had a significant effect on the efficiency, the separation efficiency of 167 μm particles changed from 76.74 to 97.93% and a smaller normal velocity restitution ratio had a higher the efficiency. In comparison, the efficiency remained unchanged when changing the tangential velocity restitution ratio. Furthermore, the effects of three target wall materials on the separation efficiency were investigated. And the simulated efficiency the of 296 μm particle of 2024 aluminum, 410 stainless steel and Ga1–4V titanium were 82.15, 79.52 and 77.53% respectively. Besides, effects of tube diameter on performances of cyclone separator were discussed and high intense collisions between particles and walls may occur in a small diameter of cyclone tube, causing deteriorated separation performance. Moreover, with the addition of the dust chamber, the efficiency of cyclone used in combination is slightly improved since the vortex in the exhaust pipe has been finely changed.

CHARACTERIZATION OF PRESSURE DROP AND VELOCITY FIELD IN A GAS-LIQUID CYCLONE SEPARATOR

2017 ◽  
Author(s):  
Juliana Loureiro ◽  
Atila Pantaleão Silva Freire ◽  
Gustavo Eduardo Oviedo Celis
Keyword(s):  
Velocity Field ◽  
Pressure Drop ◽  
Cyclone Separator

Calibration of a cyclone separator for atmospheric sampling

1987 ◽  
Vol 65 ◽  
pp. 261-266 ◽  
Author(s):  
Seshasayi Dharmavaram ◽  
Philip K. Hopke
Keyword(s):  
Cyclone Separator ◽  
Atmospheric Sampling

scholarly journals Kinematics of Disk Stars in the Solar Neighbourhood

1998 ◽  
Vol 11 (1) ◽  
pp. 574-574
Author(s):  
A.E. Gómez ◽  
S. Grenier ◽  
S. Udry ◽  
M. Haywood ◽  
V. Sabas ◽  
...  
Keyword(s):  
Dispersion Relation ◽  
Radial Velocity ◽  
Velocity Dispersion ◽  
Tangential Velocity ◽  
Thin Disk ◽  
The Other ◽  
Proper Motions ◽  
Velocity Data ◽  
Kinematic Data ◽  
Radial Velocity Data

Using Hipparcos parallaxes and proper motions together with radial velocity data and individual ages estimated from isochones, the velocity ellipsoid has been determined as a function of age. On the basis of the available kinematic data two different samples were considered: a first one (7789 stars) for which only tangential velocities were calculated and a second one containing 3104 stars with available U, V and W velocity components and total velocities ≤ 65 km.s-1. The main conclusions are: -Mixing is not complete at about 0.8-1 Gyr. -The shape of the velocity ellipsoid changes with time getting rounder from σu/σv/σ-w = 1/0.63/0.42 ± 0.04 at about 1 Gyr to1/0.7/0.62 ±0.04 at 4-5 Gyr. -The age-velocity-dispersion relation (from the sample with kinematical selection) rises to a maximum, thereafter remaining roughly constant; there is no dynamically significant evolution of the disk after about 4-5 Gyr. -Among the stars with solar metallicities and log(age) > 9.8 two groups are identified: one has typical thin disk characteristics, the other is older than 10 Gyr and lags the LSR at about 40 km.s-1 . -The variation of the tangential velocity with age(without selection on the tangential velocity) shows a discontinuity at about 10 Gyr, which may be attributed to stars typically of the thick disk populations for ages > 10 Gyr.

Sign in / Sign up

Export Citation Format

Share Document