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CLC number: TU42

On-line Access: 2015-09-03

Received: 2014-12-13

Revision Accepted: 2015-06-08

Crosschecked: 2015-08-22

Cited: 2

Clicked: 4233

Citations:  Bibtex RefMan EndNote GB/T7714


Yue-liang Cai


Hong-yue Sun


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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.9 P.760-768


Air accumulation in high-lift siphon hoses under the influence of air dissolution and diffusion

Author(s):  Yue-liang Cai, Hong-yue Sun, Yue-quan Shang, Zhi-jun Wu

Affiliation(s):  1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   shy@zju.edu.cn

Key Words:  Slope, Siphon drainage, Motionless flow during dry season, Air accumulation, Air diffusion, Temperature

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Yue-liang Cai, Hong-yue Sun, Yue-quan Shang, Zhi-jun Wu. Air accumulation in high-lift siphon hoses under the influence of air dissolution and diffusion[J]. Journal of Zhejiang University Science A, 2015, 16(9): 760-768.

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publisher="Zhejiang University Press & Springer",

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%A Yue-liang Cai
%A Hong-yue Sun
%A Yue-quan Shang
%A Zhi-jun Wu
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1400358

T1 - Air accumulation in high-lift siphon hoses under the influence of air dissolution and diffusion
A1 - Yue-liang Cai
A1 - Hong-yue Sun
A1 - Yue-quan Shang
A1 - Zhi-jun Wu
J0 - Journal of Zhejiang University Science A
VL - 16
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SP - 760
EP - 768
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1400358

In this study, air accumulation at the top of a long-term-high-lift motionless siphon hose due to air dissolution and diffusion is studied. Many factors can induce air accumulation in siphon hoses during dry seasons. In this study, effects of the unavoidable factors, such as air diffusion and dissolved-air release, are investigated. Based on experimental observations and theoretical analysis, the following results are obtained: (1) pressure decrease in high-lift siphon hoses will cause release of supersaturated air and induce a maximum 1.5 m long air column at the top of the siphon hose; (2) temperature increase will cause a maximum 0.55 m long air column; (3) air diffusion from water will lead to a less than 0.01 mm increment of the air column per day, which is considered to be negligible compared with that induced by air release due to pressure and temperature variations. Results indicate that high-lift siphon drainage can also be effectively used in arid districts. During siphon drainage design, at least 2.05 m long space to the safety level should be left for underground water rise, or the outlet should be kept 4.1 m lower than the inlet to guarantee that the released air will be gathered in the descending hoses.

this paper is a useful contribution to the literature on the practical applications of the siphon.


结论:1. 溶于水的空气因压力降低而析出、管端空气溶入扩散到虹吸管顶部及温度变化引起空气析出等现象是无法避免的;其中,原有空气的析出及温度变化引起的空气累积是主要因素;2. 边坡虹吸排水设计时进水端口距控制水位至少应预留2.05 m的地下水位上升余量,或者保持出水口的高程比进水口高程低4.1 m来保证析出空气段处于下水管中。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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