An investigation of flow characteristics in slope siphon drains

Cai, Yue-liang; Sun, Honglei; Shang, Yongjia; Xiong, Xiaoliang

doi:10.1631/jzus.a1300178

Cited by 28 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modifications were also made to the diameter of the siphon pipe. With a wider pipe's diameter, the volume of flowing gas could be assumed to get higher as described by Cai et al [23]. However, when surpassing its critical point, the velocity of flowing energy and materials has been believed to be gradually decreasedwhich might be followed by lowering transfer of the byproducts.One major gas product of the fermentation is CO2 that is dissolved in the aqueous suspension forming a possible anionic species, HCO3 -.…”

Section: Resultsmentioning

confidence: 99%

Maintaining Favourable Fermentation Conditions in Sargassum Liquid Fertilizer Production using Siphon in A Two-Containers System Resulting in Acceptable Levels of Heavy Metals

Nurhayati¹,

Asmara²,

Huslina³

2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

A U-shapedsiphon was used to connect two 600 mL disposed of mineral water-plastic bottles called container A and B. Container A served as a decomposer drum for mixingSargassum porridge, EM4 (effective microorganisms 4), organic nutrients, and water to allow an anaerobic fermentation to occur within 25 days.B was an aeration drum containing an acceptable volume of freshwater. Between these two containers, the siphon was set to bridge the air between containers above the suspension. There were 14 different configurations including a siphon with three different diameters (0.5, 1, 1.5 cm), four different lengths (16, 18, 20, 22 cm), and three different connections (connected to aeration drum, opened to air, closed). The last two configurations did not need the siphon. During the fermentation process, gas and heat were perceptibly released inone way-flowing from A to B and creating bubblesin Bleading to a maintained condition of the fermentation. As the one of main challenging aspects in the production of sargassum liquid fertilizer (SFL) is the considerable number of heavy metals, therefore, we measured some transition metals levels extracted in the filtrate post-25 days to estimate the safety level of the product compared to those mentioned in the Regulation of the Indonesian Ministry of Agriculture (Permentan70/SR/140/10/2011). All data excluding sample S4 were below the limit, except Cd level, whereby two configurations gave the least values of potentially toxic elements, which might be linked to the role of the siphon in giving a favourable condition for preventing the release of the heavy metals trapped in the cell walls.

show abstract

Section: Resultsmentioning

confidence: 99%

Maintaining Favourable Fermentation Conditions in Sargassum Liquid Fertilizer Production using Siphon in A Two-Containers System Resulting in Acceptable Levels of Heavy Metals

Nurhayati¹,

Asmara²,

Huslina³

2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Deep slope groundwater drainage requires a high-lift siphon, which makes the top area of the siphon hoses a near-vacuum (Cai et al, 2014). The negative pressure condition in this area determines whether the siphon system ( Fig.…”

Section: Air Accumulation In Long-term Motionless Siphon Hosesmentioning

confidence: 99%

“…Cai et al (2014) showed that in small diameter siphon hoses (e.g., diameter d<4.0 mm) the bubbles can occupy the entire section of the siphon hoses (Fig. 3b) and make the siphon flow stop.…”

Section: Air Accumulation In Long-term Motionless Siphon Hosesmentioning

confidence: 99%

See 1 more Smart Citation

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

Cai

Sun

Shang

et al. 2015

J. Zhejiang Univ. Sci. A

Self Cite

View full text Add to dashboard Cite

Abstract: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.

show abstract

“…However, the siphon drainage at high lift will be interrupted due to air accumulation. Cai et al [20] found that small-diameter siphon pipes could solve this problem, allowing the siphon to work effectively for a long time. These small-diameter siphon pipes have been successfully applied in slope drainage engineering.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Affecting Vacuum Formation and Drainage in the Siphon-Vacuum Drainage Method for Marine Reclamation

Shu,

Wang,

Chen

et al. 2024

JMSE

View full text Add to dashboard Cite

Traditional drainage methods for marine reclamation typically consume large amounts of energy and have a negative environmental impact. The siphon-vacuum drainage method (SVD) automatically forms a vacuum and drains using less energy. It has significant potential for research and application. In this study, a theoretical model is used to calculate the vacuum formation process and drainage rate. Qualitative analysis and global sensitivity analysis were conducted to investigate the effect of various factors in the SVD on vacuum formation and drainage. The qualitative analysis suggests that modifying the length and diameter of the siphon pipe and the thickness of the sealing soil column to increase the siphon rate can improve the vacuum degree and drainage efficiency. Sobol global sensitivity analysis reveals that the sealing soil column thickness is the main factor affecting the vacuum, with a first-order sensitivity index accounting for up to 79.48%. The impact of cylinder diameter and the local resistance coefficient (0.43%) can be almost neglected. A fitting equation for estimating the maximum achievable vacuum is provided. Calculations show that the vacuum formed by the SVD can reach over 80 kPa. This work can help optimize SVD design and advance environmentally friendly marine reclamation projects.

show abstract

An investigation of flow characteristics in slope siphon drains

Cited by 28 publications

References 17 publications

Maintaining Favourable Fermentation Conditions in Sargassum Liquid Fertilizer Production using Siphon in A Two-Containers System Resulting in Acceptable Levels of Heavy Metals

Maintaining Favourable Fermentation Conditions in Sargassum Liquid Fertilizer Production using Siphon in A Two-Containers System Resulting in Acceptable Levels of Heavy Metals

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

Analysis of Factors Affecting Vacuum Formation and Drainage in the Siphon-Vacuum Drainage Method for Marine Reclamation

Contact Info

Product

Resources

About