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Showing 1 to 11 of 11 for “"bubble-plume"”.
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Hypolimnetic Oxygenation: Coupling Bubble-Plume and Reservoir Models
… Using fundamental principles, a discrete-bubble model was first developed to predict plume dynamics and gas transfer for a circular bubble-plume diffuser. This approach has subsequently been validated in a large vertical tank and applied successfully at full-scale to an airlift aerator as …
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Characterization of Flow Turbulence Induced by a Bubble-Plume in Large-Scale Experiments
… used to conduct a preliminary design of coarse-bubble diffuser for reservoir mixing and to validate numerical models of bubble-plume systems used in the design of the combined-sewer-overflow reservoirs.
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Controlling Dissolved Oxygen, Iron and Manganese in Water-Supply Reservoirs using Hypolimnetic Oxygenation
Hypolimnetic oxygenation systems, such as linear bubble-plume diffusers, are used to improve raw water quality. Linear bubble-plume diffusers were installed in Spring Hollow Reservoir (SHR) and Carvins Cove Reservoir (CCR). Diffusers induce mixing that aids distribution of oxygen throughout the …
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Predicting induced sediment oxygen flux in oxygenated lakes and reservoirs
Bubble plume oxygenation systems are commonly used to mitigate anoxia and its deleterious effects on water quality in thermally stratified lakes and reservoirs. Following installation, increases in sediment oxygen flux (JO2) are typically observed during oxygenation and are positively correlated …
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Predicting Oxygen Transfer in Hypolimnetic Oxygenation Devices
… purpose of this research was to apply a discrete-bubble model to predict the performance of several hypolimnetic oxygenators. The model is used to predict the oxygen transfer rate in a hypolimnetic oxygenator based on the initial bubble size formed at the diffuser. The discrete-bubble model is …
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Sediment Oxygen Demand Kinetics
… water supply reservoir for Roanoke, Virginia. A bubble-plume diffuser is used in Carvin's Cove to replenish oxygen consumed while the reservoir is thermally stratified. The applicability of zero-order, first-order, and Monod kinetics to describe transient and steady state SOD was modeled using …
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Diffuser Operations at Spring Hollow Reservoir
… months. During 1997 Roanoke County purchased a bubble-plume diffuser from Tennessee Valley Authority (TVA) to oxygenate the hypolimnion to maintain long-term water quality. Spring Hollow currently operates the diffuser, with compressed air, during late summer months when DO levels in the …
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Investigating the Effects of Sparger Design in Column Photobioreactors
… parameters in these photobioreactors. The gas bubbles and the water-based media within the photobioreactor are modeled using the Lagrangian-Eulerian approach. A low Reynolds k-Epsilon turbulence model is used to predict near-wall flow patterns. Average bubbles drag coefficient and average …
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A computer model for circular and linear bubble plumes
… of this research were to implement the circular plume model developed by Wuest et al. (1992) and to develop and verify a linear plume model based on the circular model. The linear model developed is the first that models a bubble plume generated by a linear source in thermally stratified water …
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Two-Dimensional Lake and Reservoir Modeling: Natural and Plume-Induced Mixing Mechanisms
… inflows. Hypolimnetic oxygenation using bubble-plumes also leads to enhanced mixing. Whether natural or plume-induced, increased mixing will alter the waterbody properties. Conversely, the density structure affects the behavior of plumes as well as inflowing and outflowing water. For …
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Spray Aerosols From Saltwater to Freshwater Breaking Waves
… analogue tank revealed that the subsurface bubble plume in saltwater is characterized by more submillimeter bubbles than that in freshwater, and hence, saltwater surface foams were more persistent and were comprised of more submillimeter surface bubbles. Consequently, the average number …