Turbulence-Based Models for Gas Transfer Analysis with Channel Shape Factor Influence

Gualtieri, Carlo; Gualtieri, Paola

doi:10.1023/b:efmc.0000024221.82818.70

Cited by 25 publications

(26 citation statements)

References 13 publications

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“…Jä hne et al, 1989;Asher and Pankow, 1991;Chu and Jirka, 1992;Moog and Jirka, 1999;Herlina and Jirka, 2004) and comparable to other model results (e.g. Gualtieri and Gualtieri, 2004). While such estimates were already known in the 1960s (with 0.004 < L < 0.04 cm, see Metzger and Dobbins, 1967), there was a dearth of data regarding the average frequency of replacement of the liquid film r. More recent experimental values for r validate the highest renewal rates of the liquid film (e.g.…”

Section: 1supporting

confidence: 80%

“…an increase at the geometric rate of 2.41% per C (Kilpatrick et al, 1989;Bott, 2007, p. 671;Stenstrom, 2007), no doubt based on the meticulous bottle experiments of Elmore and West (1961) but also most likely because some prominent theoretical models for free water surface confirmed those experimental results (e.g. King, 1966;Lamont and Scott, 1970;Wilson and Macleod, 1974;Gualtieri and Gualtieri, 2004). Other constant values for q have been used, generally based on older experiments, probably unaware of the sharp criticisms by e.g.…”

Section: 4mentioning

confidence: 95%

“…Calibrated with gaseliquid systems in falling thin films Films theory Gualtieri and Gualtieri (2004) …”

Section: Dobbins Modelmentioning

confidence: 99%

“…A turbulent thin film (Prasher and Fricke, 1974) was also selected as a contrast to the eddy models. And finally, the films model of Gualtieri and Gualtieri (2004) was selected as it was calibrated for the USGS river aeration data (the most comprehensive and accurate river dataset available until Raymond et al, 2012). The temperature dependence of K L in Gualtieri and Gualtieri films model may not rest on the calibrated model with R gÀt ¼ 0.75, since it prevents R gÀt to vary with temperature via the viscosity of water as apparent in Eq.…”

Section: Other Theoretical Modelsmentioning

confidence: 99%

“…The thickness of the velocity boundary layer d v is also temperature dependent relative to the diffusive or concentration boundary layer d c as follows (Eq (2) in Gualtieri and Gualtieri, 2004):…”

Section: Continuous Surface Watermentioning

confidence: 99%

See 4 more Smart Citations

Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Demars

Manson

2013

Water Research

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Section: 1supporting

confidence: 80%

Section: 4mentioning

confidence: 95%

“…Calibrated with gaseliquid systems in falling thin films Films theory Gualtieri and Gualtieri (2004) …”

Section: Dobbins Modelmentioning

confidence: 99%

Section: Other Theoretical Modelsmentioning

confidence: 99%

Section: Continuous Surface Watermentioning

confidence: 99%

See 3 more Smart Citations

Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Demars

Manson

2013

Water Research

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Humic substances reduce the oxygen mass transfer in the air–water interface

et al. 2020

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The aim of this study was to investigate the influence of humic substances (HS) on volumetric oxygen-transfer coefficient (K L a) under different turbulence intensities at the air-water interface. The experiments were carried out in an oscillating grid tank which provided three levels of turbulence intensities (Reynolds numbers of 5,116, 10,316, and 15,433). For each turbulence level, 15 different HS concentrations were tested and the K L a was estimated. The results showed that, regardless of the turbulence level in the tank, HS reduces K L a. The maximum reduction was 17%. The barrier effect, produced by the occupation of HS molecules at the interface, was the main phenomenon responsible for the reduction in the oxygen transfer. A relationship between the oxygen transfer velocity and turbulent kinetic energy showed that in the presence of HS, the air-water interface behaves like an immobile surface, reducing the oxygen diffusion and surface renewal.gas-water interface, grid-stirred tank, humic substances, oxygen mass transfer, reaeration

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Two‐phase flow simulation of supersaturated total dissolved gas in the plunge pool of a high dam

Zhang

et al. 2016

Env Prog and Sustain Energy

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Total dissolved gas (TDG) supersaturation can cause potentially fatal Gas Bubble Disease (GBD) in fish and is recognized for its severe environmental impact for high‐dam operation conditions. The generation of supersaturated TDG in high‐head hydropower project is substantially different from middle‐ or low‐head projects that have been previously studied. Although the mechanics of TDG generation in a plunge pool are clearly three‐dimensional (3D), there are great challenges and difficulties of the 3D simulation for high‐dam projects. Toward this end, a two‐dimensional (2D) model of two‐phase flow in high‐dam plunge pool is developed with established computational fluid dynamics (CFD) software. New simulation modules are developed to account for a normal distribution of bubble sizes, which allows the TDG mass transfer from bubbles and across the free surface to include bubble size nonlinearities that were previously neglected. The model is calibrated based on observations from a high‐dam hydropower project with a ski‐jump spillway and deep plunge pool. Characteristics of simulated hydrodynamics, air‐bubble distribution, and TDG distribution downstream of the high dam were analyzed. Results showed that the model achieved satisfactory calibrated simulation of dissolved gas behavior and the assumption of a bubble normal distribution could properly reflect the bubble transfer process. Residence time in the plunge pool appeared to be a key factor determining maximum modeled TDG supersaturation levels. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1139–1148, 2016

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Turbulence-Based Models for Gas Transfer Analysis with Channel Shape Factor Influence

Cited by 25 publications

References 13 publications

Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Humic substances reduce the oxygen mass transfer in the air–water interface

Two‐phase flow simulation of supersaturated total dissolved gas in the plunge pool of a high dam

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