XIAYan-hui,WANGWen-hai,GONGYong-wei,et al.Terminal Velocity of Vertical Drainage Pipe Based on Impact Force Measurement[J].China Water & Wastewater,2023,39(15):122-126.
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Terminal Velocity of Vertical Drainage Pipe Based on Impact Force Measurement

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第15期 Page: 122-126 Column: Date of publication: 2023-08-01
Author(s):
XIA　Yan-hui1; 2;  WANG　Wen-hai1; 3;  GONG　Yong-wei1; 3;  XIE　Peng1;  ZHAO　Zi-xuan1
（1. Key Laboratory of Urban Stormwater System and Water Environment ， Beijing University of Civil Engineering and Architecture， Beijing 100044， China； 2. Lianhe Equator Environmental Impact Assessment Co. Ltd.， Tianjin 300042， China； 3. Beijing Advanced Innovation Center for Future Urban Design， Beijing 100044， China）
Keywords:
vertical drainage pipe;  terminal velocity;  impact force;  momentum equation
Abstract:
This paper proposed a method based on impact force measurement to measure whether there was a terminal velocity of water flow in building vertical drainage pipe. The force of water impacting on the plate was converted into voltage signal collection through a weighing transmitter and a weight sensor, and then the impact force was converted into the falling velocity of water according to the fluid momentum equation. After exceeding a certain height, the flow velocity at the lower end of the vertical drainage pipe had little relation with the height of the pipe. The conclusion that the terminal flow velocity existed in the vertical drainage pipe and was positively correlated with the flow rate was verified. The quadratic function relation between flow velocity and flow rate was fitted, and the correlation coefficient R2 was 0.946 7. The reliability of this method was preliminarily verified, which could provide theoretical support for the design of building vertical drainage pipe and related measurement.
Last Update: 2023-08-01