Head Loss Reduction in Surcharged Four-Way Junction Manholes

Kim, Jung Soo; Jo, Jun Beom; Yoon, Sei Eui

doi:10.3390/w10121741

Cited by 13 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the complex nature of flow is affected by an almost infinite variety of geometrical and hydraulic factors [14]. Some critical factors are the inflow rate, the shape of a manhole, surcharge condition, connecting pipe size, angle of connection, and manhole diameter ratios, among others [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Determination of Head Loss Coefficients of Two-Way Surcharged Manholes

Dündar,

Özölçer,

Doğan

2023

Water

View full text Add to dashboard Cite

The loss coefficient is one of the most critical parameters in computing the hydraulic grade line of sewer systems. The head loss coefficient of a manhole is dependent on various hydraulic and structural characteristics, such as manhole mold, connection angle, and the ratio of manhole diameter to pipe diameter. Three different manhole molds, flat, half-bench, and full-bench, and connection angles of 180°, 90°, and 135° are investigated, where the manhole diameter to pipe diameter ratio is 5.3. This paper presents the results of experimental and numerical investigations focused on determining the loss coefficient for two-way straight-through and angled manholes. The flow structure inside the chimney is the significant parameter for the magnitude of the energy loss coefficient. The head loss coefficient is almost constant under the surcharged flow conditions for all kinds of manholes. In terms of head loss coefficients, half-channel manholes do not have a significant advantage over flat-bottomed manholes in the cases of 135° and 90° flow inputs. The full-bench bottom manhole head loss coefficient is the smallest. The computational fluid dynamic modeling results agree with the experimental studies.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Determination of Head Loss Coefficients of Two-Way Surcharged Manholes

Dündar,

Özölçer,

Doğan

2023

Water

View full text Add to dashboard Cite

show abstract

“…Urban drainage systems are usually designed for stormwater events with a return period of 2-10 years, which usually consist of combined surface and underground infrastructures. The hydraulic performance of drainage structures such as street inlets, manholes and drop shafts, as well as sewer pipes, can affect the overall conveyance efficiency of the whole storm drainage system and also affect the flood inundation extent of streets and roadways during stormwater events (Chanson, 2004;Djordjević et al, 2005;León et al, 2010;Leandro and Martins, 2016;Kim et al, 2018). A detailed numerical model study of an urban flood occurring in a campus indicated that about 70% of the total stormwater volume was released from various street inlets into the underground drainage system (Liu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A unified formula for discharge capacity of street inlets for urban flood management

Xia

Dong

Ahmadian

et al. 2022

Journal of Hydrology

View full text Add to dashboard Cite

“…Results show that various parameters affect the hydraulic performance of the drop manhole. Kim et al (2018) used a physical model to derive efficient benching designs that can reduce head loss. Results indicate that the installation of full rectangular benching reduced the head loss coefficients and can be installed to improve the drainage capacity of urban stormwater conduit facilities.…”

Section: Introductionmentioning

confidence: 99%

Physical modelling of energy losses at surcharged three-way junction manholes in drainage system

Xia

Deng

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

Motivated by the observation that vortex flow structure was evident in the energy loss at the surcharged junction manhole due to changes of hydraulic and geometrical parameters, a physical model was used to calculate energy loss coefficients and investigate the relationship between flow structure and energy loss at the surcharged three-way junction manhole. The effects of the flow discharge ratio, the connected angle between two inflow pipes, the manhole geometry, and the downstream water depth on the energy loss were analyzed based on the quantified energy loss coefficients and the identified flow structure. Moreover, two empirical formulae for head loss coefficients were validated by the experimental data. Results indicate that the effect of flow discharge ratio and connected angle are significant, while the effect of downstream water depth is not obvious. With the increase of the lateral inflow discharge, the flow velocity distribution and vortex structure are both enhanced. It is also found that a circular manhole can reduce local energy loss when compared to a square manhole. In addition, the tested empirical formulae can reproduce the trend of total head loss coefficient.

show abstract

Head Loss Reduction in Surcharged Four-Way Junction Manholes

Cited by 13 publications

References 17 publications

Experimental and Numerical Determination of Head Loss Coefficients of Two-Way Surcharged Manholes

Experimental and Numerical Determination of Head Loss Coefficients of Two-Way Surcharged Manholes

A unified formula for discharge capacity of street inlets for urban flood management

Physical modelling of energy losses at surcharged three-way junction manholes in drainage system

Contact Info

Product

Resources

About