Precision Water Distribution Control of New Type Sewage Distributor

2012 ◽  
Vol 155-156 ◽  
pp. 1015-1019
Author(s):  
Yi Shu Hao ◽  
Kai Shun Ji ◽  
Zong Yue Liu
Keyword(s):  
Pid Controller ◽  
Water Distribution ◽  
Sewage Treatment ◽  
Flow Distribution ◽  
Uniform Flow ◽  
Controlled System ◽  
Uniform Flow Distribution ◽  
Stepper Motors ◽  
New Type ◽  
Novel Method

This paper focuses on the issues of uniform flow distribution control for sewage treatment devices. A novel method for uniform flow distribution was proposed, in which a new type sewage distributor employing two phrase stepper motors is integrated to replace the conventional one. The model of permanent magnet stepper motor is mainly discussed. A proportional-integral-derivative (PID) controller is designed for this new type distributor. The performance of general controlled system is simulated, compared by tuning the parameters. And the control system is evaluated in practical use.

scholarly journals Modeling of flow uniformity by installing inlet distributor within the inflow part of a pressurized module using computational fluid dynamics

2020 ◽  
Vol 25 (6) ◽  
pp. 969-976
Author(s):  
Changkyoo Choi ◽  
Chulmin Lee ◽  
In S. Kim
Keyword(s):  
Water Distribution ◽  
Flow Distribution ◽  
Uniform Flow ◽  
Membrane Module ◽  
Energy Utilization ◽  
Cross Sectional ◽  
Uniformity Coefficient ◽  
Fluid Behavior ◽  
Uniform Flow Distribution ◽  
Velocity Pressure

Uniform flow distribution is a significant parameter for designing pressurized membrane modules because non-uniform flow distribution can cause serious local flux and fouling problems within a module. Thus, this study investigated the fluid behavior with regards to the evenness of water distribution using newly designed inlet distributors in the inflow part of a pressurized membrane module. From the results of velocity and pressure at the cross-sectional and outlet planes, we confirmed that a conventional membrane module with no distributor (non-distributor) had fluid that was concentrated at the central part. Case 1, which had a cross-shaped distributor, reduced the central concentration tendency, and Case 2, which had a round-shaped distributor, displayed a relatively uniform flow based on the velocity, pressure, flux, and standard deviation data. Here, the non-uniformity coefficient (<i>N</i>) and energy utilization (<i>η</i>) for Cases 1 and 2 showed a lower non-uniformity coefficient (0.030 and 0.017, respectively) than for the Non-distributor (0.039). The energy utilization of Cases 1 and 2 were higher (1.35e-0.5 and 1.46e-05) than the Non-distributor (1.64e-05). Overall, we confirmed that the inlet distributors led to increased evenness of flow distribution within an inflow part.

Analysis of non-uniform flow distribution in parallel micro-channels

2019 ◽  
Vol 33 (8) ◽  
pp. 3859-3864 ◽  
Author(s):  
Jungchul Kim ◽  
Jeong Heon Shin ◽  
Sangho Sohn ◽  
Seok Ho Yoon
Keyword(s):  
Flow Distribution ◽  
Uniform Flow ◽  
Micro Channels ◽  
Uniform Flow Distribution

Effect of Non Uniform Flow Distribution on Single Phase Heat Transfer in Parallel Microchannels

2007 ◽  
Author(s):  
Akhilesh V. Bapat ◽  
Satish G. Kandlikar
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Single Phase ◽  
Flow Distribution ◽  
Uniform Flow ◽  
Hydrodynamic Performance ◽  
Flow Area ◽  
Cross Sectional ◽  
Uniform Flow Distribution ◽  
Parallel Microchannels

The continuum assumption has been widely accepted for single phase liquid flows in microchannels. There are however a number of publications which indicate considerable deviation in thermal and hydrodynamic performance during laminar flow in microchannels. In the present work, experiments have been performed on six parallel microchannels with varying cross-sectional dimensions. A careful assessment of friction factor and heat transfer in is carried out by properly accounting for flow area variations and the accompanying non-uniform flow distribution in individual channels. These factors seem to be responsible for the discrepancy in predicting friction factor and heat transfer using conventional theory.

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