Minimum Air Gap between Drinking Water Outlet and Surface of Sewage

Abstract:

To prevent the contaminated water from flowing back into the potable water supply, Particle Image Velocimetry (PIV) was employed to measure the variation of flow field and study the relation between the minimum air gap h and the water outlet diameter d concretely. The theoretical analysis and the experimental results show that the h/d is not vary linearly as required in ‘Code for Design of Building Water Supply and Sewerage’ but exponentially.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 1940-1944
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.1940
• Online since: January 2012
• Authors: Yun Xia Zhang, San Xiang Sun, Li Yun Zeng
• Keywords: Drinking Wate, Minimum Air Gap, Particle Image Velocimetry (PIV)

References

[1] China Engineering Construction Standardization Association, Code for Design of Building Water Supply and Sewerage, Beijing: China Architecture & Building Press, 2003. (in Chinese).

[2] Hardy P G and Richter H J, Pressure Transient and Two-Phase Swelling due to Top Break, Nucl Eng Design, vol. 95, pp.207-220, (1986).

DOI: 10.1016/0029-5493(86)90048-8

[3] Xu J L, ChenTK, Yang LW and Song JY, Liquids entrainment in the mall break from the top of horizontal pipe, Engineering of Nuclear Power, vol. 16, pp.246-251, 1995. (in Chinese).

[4] Dandy, FlowManager software and Introduction to PIV Instrumentation, Denmark: Dantec Dynamics A/S, (1994).

[5] L. M. Hopkins, J.T. Kelly, A.S. Wexler and A.K. Prasad, Particle image velocimetry measurements in complex geometries, Experiments in Fluids, vol. 29, pp.91-95, (2000).

DOI: 10.1007/s003480050430

[6] S. T. Wereley and C.D. Meinhart, Second-order accurate particle image velocimetry, Experiments in Fluids, vol. 31, pp.258-268, (2001).

DOI: 10.1007/s003480100281

[7] Y.D. Choi, K. Nishino, J. Kurokawa and J. Matsui, PIV measurement of internal flow characteristics of very low specific speed semi-open impeller, Experiments in Fluids, vol. 37, pp.617-630, (2004).

DOI: 10.1007/s00348-004-0838-7

[8] Fujiwara,Y. Danmoto, K. Hishida and M. Maeda, Bubble deformation and flow structure measured by double shadow images and PIV/LIF, Experiments in Fluids, vol. 36, pp.157-165, (2004).

DOI: 10.1007/s00348-003-0691-0

[9] Zhang Y X, Sun S X and Zhu K, Experimental analysis on the pollution by dringking water back flow, Energy and Environment, vol. 6, p.9, 2009. (in Chinese).

[10] Wang Z Z, Building Water and Wastewater Engineering, Beijing: China Architecture & Building Press, 2005. (in Chinese).

[11] Beijing specified value of Nuclear Engineering, Design Manual for Building Water Supply and Drainage (2nd edition), Beijing: China Architecture & Building Press, 2004. (in Chinese).

[12] Zhao M, Study on hydraulic safety and water quality safety for transmission and distribution system, Dissertation for the Doctoral Degree, Harbin: Harbin Institute of Technology, 2008. (in Chinese).

[13] W. Steicher, Minimizing the risk of water hammer and other problems at the begging of stagnation of solar thermal plants, Solarenergy, vol. 69, p.187~196, (2000).

[14] M. Edwards, Controlling Corrosion in Drinking Water Distribution Systems: a Grand Challenge for the 21st Century , Water Science and Technology, vol. 49, p.1~8, (2004).

DOI: 10.2166/wst.2004.0073