Study of Gas Velocity Distribution in Electrostatic Precipitators

In order to study the flue gas velocity distribution and pressure drop characteristics inside wet desulfurization Tower, experimental study has been carried out. Flow model is built with geometric scale of 1 / 12 , flue gas velocity ratio of 1 / 1 and different gas entrance angle as 12°and 7°. Experiment result shows that Spray liquid droplets made gas more evenly; The evenness of gas velocity distribution is very poor with very low gas load (<35%);The pressure drop in tower increases with increase of sprayer and increases with increase of gas load; The evenness of gas velocity distribution becomes poor and the pressure drop increases when gas inlet angle changes from 12°to 7°.

Download Full-text

Measurement of gas velocity distribution using a wire-mesh electrostatic probe

Sensors and Actuators A Physical ◽

10.1016/j.sna.2003.10.086 ◽

2004 ◽

Vol 112 (2-3) ◽

pp. 237-243 ◽

Cited By ~ 2

Author(s):

Ok Jin Joung ◽

Young Han Kim ◽

Si Pom Kim

Keyword(s):

Velocity Distribution ◽

Wire Mesh ◽

Gas Velocity ◽

Electrostatic Probe

Download Full-text

Gas velocity distribution in conical spouted beds with high‐density particles

The Canadian Journal of Chemical Engineering ◽

10.1002/cjce.24012 ◽

2021 ◽

Author(s):

Neslin Dogan ◽

Murat Koksal ◽

Gorkem Kulah

Keyword(s):

Velocity Distribution ◽

High Density ◽

Gas Velocity ◽

Spouted Beds

Download Full-text

Probability density function of granular-gas velocity distribution

Chinese Science Bulletin (Chinese Version) ◽

10.1360/972009-224 ◽

2009 ◽

Vol 54 (11) ◽

pp. 1483-1487 ◽

Cited By ~ 1

Author(s):

寅阊李 ◽

MeiYing &amp LI YinChang HOU

Keyword(s):

Probability Density Function ◽

Velocity Distribution ◽

Probability Density ◽

Density Function ◽

Gas Velocity ◽

Granular Gas

Download Full-text

Investigation of Internal Flow Velocity Distribution and Gas Loss of High-Speed Supercavitating Flows

Volume 2, Fora: Cavitation and Multiphase Flow; Advances in Fluids Engineering Education ◽

10.1115/fedsm2017-69468 ◽

2017 ◽

Author(s):

Wang Zou ◽

Lei-Ping Xue ◽

Wei-Wei Jin ◽

Xin-Tao Xiang

Keyword(s):

Velocity Distribution ◽

Cross Section ◽

High Speed ◽

Radial Direction ◽

Cavitation Number ◽

Gas Velocity ◽

Loss Mechanism ◽

Ventilated Supercavity ◽

Gas Loss ◽

Internal Velocity

Internal velocity distribution is an important content of flow structure and reveals the gas loss mechanism for supercavitating flows. Considering the three-phase momentum interactions and the water-vapor mass transport, the water-gas-vapor multi-fluid model is established to simulate ventilated supercavitating flows at high speed in the frame of the nonhomogeneous multiphase flows theory. Based on the model, the gas velocity field inside supercavity is studied. In the case of supercavitating flows around disk cavitator, two vortex cores are formed in the longitudinal plane under the actions of the adverse pressure gradient in the tail and the viscous friction on cavity surface, and are symmetrically distributed about the longitudinal axis. Most inner regions in the cavity cross section are occupied by circulation flows, where the velocity is in the opposite direction of incoming flows and decreases in the radial direction. When passing the vortex center, the velocity changes direction and increases in the radial direction. Part of gas departs to wake flows from the outermost regions close to the section boundary. The results confirm Spurk’s assumption for gas entrainment in detail. It is also found that the gas velocity distribution in the cross section through vortex cores does not depend on cavitation number. Supercavitating vehicle has the similar internal velocity distribution and gas loss mechanism. Due to the added viscous effect of the enveloped body, there are multiple axisymmetrical distributed vortices inside the cavity. The relative distance between the vortex core and the cavity wall increases downstream. Computations of ventilated supercavitating flows at different Reynolds numbers show that the gas leakage is decreasing with increasing Reynolds number for a given cavitation number. This study deepens the understanding of gas loss for ventilated supercavity at high speed, and lays a foundation for further refinement of the dynamic model of the maneuvering ventilated supercavity and the control of ventilated supercavitating flows.

Download Full-text

Numerical Simulation for Gas Supply Line Design in Manufacturing Process of Silicon Solar Cells Based on Steady State Fluid Dynamics

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.252.331 ◽

2012 ◽

Vol 252 ◽

pp. 331-336

Author(s):

Rong Lian Chen ◽

Song Hao Wang ◽

Yi Sun ◽

Yun Jiang Dong

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Solar Cells ◽

Steady State ◽

Laminar Flow ◽

Velocity Distribution ◽

Silicon Solar Cells ◽

Gas Velocity ◽

Line Design ◽

Gas Supply

This paper presents the numerical analysis of the velocity distribution in for a Fully Automatic Horizontal Diffusion Furnace for manufacturing Silicon Solar Cells. Diffusion and convection usually are interconnected in physics world, while convection is directly connected with flow velocity. Therefore, in a diffusion oven, the velocity of the gas(es) surrounding the wafer zone would play an important role in the quality of the process. A more uniform laminar flow surrounding the area, should in fact results in more consistent wafer quality. Therefore, the focus of the study is to compare the velocity field in the neighboring area, for different arrangement of gas intake. Numerical simulation has been conducted to provide guidance of designing the gas supply tube and the nozzles. Three dimensional, Steady State Fluid Dynamics analyses have been made. From the results of the simulation, the supply gas velocity distribution is very sensitive to the parameters. Gas supply line design with variable nozzle diameters form 2.0 to 3.5 provides the better gas velocity distribution, ensuring fresh gas to the wafer zone with gentle laminar flow in this study.

Download Full-text