Vortex Drop Shaft for Supercritical Flow

Giudice, Giuseppe Del; Gisonni, Corrado; Rasulo, Giacomo

doi:10.1007/978-3-540-89465-0_262

Cited by 8 publications

(13 citation statements)

References 8 publications

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“…The elaborations described in this paper are based on different experimental data [8,15,17,22,25,26]. All of them were collected by performing experiments in physical devices of vortex drop shafts in compliance with the standard layout of Figure 1.…”

Section: Physical Device Layoutmentioning

confidence: 99%

“…According to this scheme a rectangular inlet channel (subscript o) of width b conveys the approach flow in the inlet device. The approach flow was supercritical (F o = V o /(g•h o ) 0.5 > 1.00, with g as the gravity acceleration and V o and h o as the approach flow average velocity and depth, respectively, except for [15,25]. The inlet device consists in a tangential inlet or in a spiral inlet device, in which the approach flow is abruptly deviated towards the shaft and it assumes the typical helicoidal flow with a stable air core.…”

Section: Physical Device Layoutmentioning

confidence: 99%

“…In the end, an outlet tunnel (subscript u), with a circular or rectangular cross-section of diameter D u or width b u , respectively, exits the dissipation chamber. and depth, respectively, except for [15,25]. The inlet device consists in a tangential inlet or in a spiral inlet device, in which the approach flow is abruptly deviated towards the shaft and it assumes the typical helicoidal flow with a stable air core.…”

Section: Physical Device Layoutmentioning

confidence: 99%

“…A large set of measurements were collected during the experiments of [8,15,17,22,25,26]. Among all, the elaborations of the present study focus basically on the experimental measurements of: 1. the approach discharge Q entering the vortex drop shaft structure 2. the flow depths h along the inlet channel and the outlet tunnel 3. the pressures p registered on the bottom of the dissipation chamber Q was measured through inductive discharge devices [8,17], with a ±0.5% full scale (FS) accuracy, and with electromagnetic flowmeters of ±0.5% FS accuracy [22,26].…”

Section: Instrumentationmentioning

confidence: 99%

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Energy Head Dissipation and Flow Pressures in Vortex Drop Shafts

Crispino

Contestabile

Vicinanza

et al. 2021

Water

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Vortex drop shafts are special manholes designed to link sewer channels at different elevations. Significant energy head dissipation occurs across these structures, mainly due to vertical shaft wall friction and turbulence in the dissipation chamber at the toe of the shaft. In the present study two aspects, sometimes neglected in the standard hydraulic design, are considered, namely the energy head dissipation efficiency and the maximum pressure force in the dissipation chamber. Different physical model results derived from the pertinent literature are analyzed. It is demonstrated that the energy head dissipation efficiency is mostly related to the flow impact and turbulence occurring in the chamber. Similarly to the drop manholes, a relation derived from a simple theoretical model is proposed for the estimation of the energy head loss coefficient. The analysis of the pressures measured on the chamber bottom allows to provide a useful equation to estimate the pressure peak in the chamber as a function of the approach flow energy head.

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Section: Physical Device Layoutmentioning

confidence: 99%

Section: Physical Device Layoutmentioning

confidence: 99%

Section: Physical Device Layoutmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

See 2 more Smart Citations

Energy Head Dissipation and Flow Pressures in Vortex Drop Shafts

Crispino

Contestabile

Vicinanza

et al. 2021

Water

Self Cite

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“…Also, aided by an expanded knowledge on flow regimes in sewer junctions, and specifically on surcharged junction flows, the combined supercritical flows in these junctions have been studied by many researchers (Del Giudice et al 2000;Del Giudice & Hager 2001;Gargano & Hager 2002;Gisonni & Hager 2002;Zhao et al 2004Zhao et al , 2006Zhao et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effects of combining sewer junction characteristics on the hydraulic parameters of flow in fully surcharged condition

Motlagh

Nazemi

Sadraddini

et al. 2012

Water & Environment J

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In this study, the effects of different parameters on flow structure and flow hydraulics for combining sewer junction consisting of manhole and lateral inflow were investigated numerically. For this purpose, the effects of dimension variations, main and lateral pipe slope, angle and the joint position of lateral pipe beside manhole, manhole geometry, and the outflow rate of manhole on flow structure and energy loss coefficients were investigated. Results show that the rate of energy loss decreases by heightening the installation position of lateral pipe beside manhole. In addition, it was shown that the slope variations of main and lateral pipes and outflow rate do not affect the rate of energy loss.

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