Crossing Turbulent Boundaries: Interfacial Flux in Environmental Flows

Grant, Stanley B.; Marušić, Ivan

doi:10.1021/es201778s

Cited by 48 publications

(61 citation statements)

References 49 publications

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“…As such, insights into the coherent structures that influence transport provide new ways of looking at each of these phenomena (Nezu 2005, Nikora et al 2007, Nikora 2010, Grant and Marusic 2011.…”

Section: Coherent Structures and Hydraulic Phenomenamentioning

confidence: 99%

Coherent structures in flow over hydraulic engineering surfaces

Adrian

Marušić

2012

Journal of Hydraulic Research

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112

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Wall-bounded turbulence manifests itself in a broad range of applications, not least in hydraulic systems. Here, we briefly review the significant advances over the past few decades in the fundamental study of wall turbulence over smooth and rough surfaces, with an emphasis on coherent structures and their role at high Reynolds numbers. We attempt to relate these findings to parallel efforts in the hydraulic engineering community and discuss the implications of coherent structures in important hydraulic phenomena.

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Section: Coherent Structures and Hydraulic Phenomenamentioning

confidence: 99%

Coherent structures in flow over hydraulic engineering surfaces

Adrian

Marušić

2012

Journal of Hydraulic Research

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112

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“…Adding hydrophilic HPC into PAN casting solutions could change the permeability properties of HPC/PAN blend membranes. The permeability properties of blend membranes prepared from 20wt% of HPC in casting solutions at 30±2 0 C and 65% of humidity, and 60s of atmosphere exposing time in 1/1(v/v) of glycerol/water aqueous solution as coagulation bath could reach optimum harmony, water flux was 372 L·h-1·m -2 , and it was enough to filter particles and bacteria in water [15][16]. Casting temperature and coagulation bath temperature were two important factors to determine the final permeability properties of blend membranes, the image of HPC/PAN blend membrane was obviously affected by them.…”

Section: Discussionmentioning

confidence: 99%

“…2. From the results listed in Table 5, combination properties of blend membrane coagulated in 1/1 (v/v) glycerol/water aqueous solution were best, 372 L·h-1·m -2 water flux was most appropriate for filter particles and bacteria in water [15,16], the value too big the filter effect but was worse. With glycerol content increased, HPC's solidification velocity relative increased, but PAN's solidification velocity was not according with it, the resulting membrane structure became uneven imaged in Fig.…”

Section: The Effects Of Coagulation Bath Composition On Permeability mentioning

confidence: 99%

Permeability characterization of hydroxypropylcellulose/ polyacrylonitrile blend membranes

Gong

2013

E-Polymers

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A series of blend membranes were prepared by immersion precipitation phase inversion method using hydroxypropylcellulose and polyacrylonitrile as raw materials. The effects of casting conditions on membrane's characterization were studied. The properties of resulting blend membranes were that water flux decreased from 489 L·h -1 ·m -2 to 312 L·h -1 ·m -2 ; retention rate increased from 80.1% to 91.8%; and corresponding porosity presented increasing trend but changed little within the range of casting solution concentrations from 10 wt % to 16 wt %. The greater the mass fraction of HPC in casting solution, the greater the water flux of blend membranes. Prolonging the atmosphere exposing time, water flux increased from 268 L·h -1 ·m -2 about 20s to 372 L·h -1 ·m -2 about 60 s, then decreased to 340 L·h -1 ·m -2 about 75s. In addition, retention rate decreased from 91.2% to 81.3%. Porosity tend to decrease but changed a little. With the coagulation bath temperature rising, water flux of blend membranes increased from 306 L·h -1 ·m -2 about 20 0 C to 429 L·h -1 ·m -2 about 35 0 C, and corresponding retention rate decreased from 87.9% to 82.5%, porosity decreased from 80.23% to 68.26%.

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“…In real streams, velocities are widely distributed and models using a single velocity that account for only a portion of the main-channel flow are not adequate. These models have been extended to include information about velocity distributions in various ways, such as memory kernels (Marion et al 2008) or additional storage zones that incorporate additional time scales (Choi et al 2000, Grant and Marusic 2011, Hensley and Cohen 2012.…”

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confidence: 99%

Effects of benthic and hyporheic reactive transport on breakthrough curves

Aubeneau

Drummond²,

Schumer

et al. 2015

Freshwater Science

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In streams and rivers, the benthic and hyporheic regions harbor the microbes that process many stream-borne constituents, including O 2 , nutrients, C, and contaminants. The full distribution of transport time scales in these highly reactive regions must be understood because solute delivery and extended storage in these metabolically active zones control the opportunity for biogeochemical processing. The most commonly used transport models cannot capture these effects. We present a stochastic model for conservative and reactive solute transport in rivers based on continuous-time random-walk theory, which is capable of distinguishing and capturing processes not described by classical approaches. The model includes surface and subsurface storage zones with arbitrary residence-time distributions. We used this model to evaluate the effects of sorption and biological uptake on downstream solute transport. Linear or mildly nonlinear sorption in storage delays downstream transport without changing the fundamental shape of the breakthrough curves (BTCs). Highly nonlinear sorption isotherms can induce power-law tailing in stream BTCs. Model simulations show that sorption of commonly used solute tracers is not sufficient to explain the power-law tailing that has been observed in field tracer-injection studies, and instead, such tailing most probably reflects broad distributions of hyporheic exchange time scales. First-order biological uptake causes an exponential decline in instream tracer concentrations at the time scale of the uptake kinetics, thereby tempering power-law BTCs. The model can be used to calculate reach-scale reaction-rate coefficients in surface and subsurface storage from observed BTCs of co-injected conservative and reactive solutes, providing new capability to determine reactionrate coefficients in storage zones with broad residence-time distributions.

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Crossing Turbulent Boundaries: Interfacial Flux in Environmental Flows

Cited by 48 publications

References 49 publications

Coherent structures in flow over hydraulic engineering surfaces

Coherent structures in flow over hydraulic engineering surfaces

Permeability characterization of hydroxypropylcellulose/ polyacrylonitrile blend membranes

Effects of benthic and hyporheic reactive transport on breakthrough curves

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