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Showing 1 to 20 of 24 for “"hydraulic resistance"”.
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Hydraulic Resistance due to Emergent Wetland Vegetation
Models to estimate hydraulic resistance due to vegetation in emergent wetlands are crucial to wetland design and management. Hydraulic models that consider vegetation rely on an accurate determination of a resistance parameter such as a friction factor or a bulk drag coefficient. At low Reynolds …
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Acoustic monitoring of hydraulic resistance in partially full pipes.
Hydraulic losses in sewer pipes are caused by wall roughness, blockages and in-pipe sedimentation. Hydraulic resistance is a key parameter that is used to account for the hydraulic energy losses and predict the sewer system propensity to flood. Unfortunately, there are no objective methods to …
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Evaluation of Linear and Nonlinear Concepts of Hydraulic Resistance in Alluvial Channels
In view of the state-of-the-art of research on hydraulic resistance in alluvial channels, a new set of equations has been proposed for the determination of the hydraulic resistance coefficient for alluvial channels with steady, reachwise uniform flow in equilibrium sediment transport. An analytical …
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The Formation, Propagation and Stability of Self-Sustained Detonation Waves in Gaseous Mixtures, Condensed-Phase Explosives and Media With Hydraulic Resistance
… propagation of a detonation though media with hydraulic resistance. In the framework of the model three-step reaction we demonstrate multiplicity of the detonation regimes. We construct detonation speed versus friction curves for super-detonation, choking detonation, and shockless subsonic …
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Development of a Hollow-Core Fiberoptic Microneedle Device for the Treatment of Invasive Bladder Cancer
The hydraulic resistance characterization manuscript chronicles the early development of the hollow-core fiberoptic microneedle device (FMD). The study determined that for straight tubing with an inner bore of 150 ?m and a length greater than 50 mm long, Poiseuille's Law was shown to be accurate …
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Design Theory for Channel-less, Low-Pressure, Pressure-Compensating Drip Emitters
… to being low-pressure by removing the smallest hydraulic feature of conventional emitters, the channel. The designs proposed are ‘channel-less’ and replace the pressure-varying hydraulic resistance of the channel with hydraulic resistance stemming from offsetting the outlet of the emitter away …
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Overland flow on disturbed soil
… rainfall; surface roughness storage and hydraulic resistance of overland flow. Experimental plots, with four types of tillage implemented roughness, were equipped with piezometer sets buried under the surface to measure hydrostatic pressure and a system of flow tracers composed of …
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A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes
… types are examined experimentally: increased hydraulic resistance of the mixed cake layer structure, hindered foulant diffusion due to interactions between solute concentration polarization (CP) layers, and changes in colloid surface properties due to organic adsorption. Additionally, a …
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Branch junction constriction and hydraulic limitation in two species in the Cape Proteaceae : a mechanism explaining the trade-off between longevity and degree of ramification in the Cape Proteaceae
The purpose of this study was to establish if hydraulic limitation and branch junction constriction explain the trade-off between longevity and increased ramification in species of the Cape Proteaceae. This was done by establishing if branch nodes are regions of greater resistance to xylem sap flow …
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3D-Printed, Internally Fed Electrospray Thruster
… a cleanroom so far, primarily due to their high hydraulic resistance requirement. In this study, this problem was approached in two ways to 3D print the internally fed electrospray thruster. The first approach was optimizing the channel design, considering 3D printing resolution and electrospray …
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Hydrodynamics of aqueous humor outflow
… pressure caused by a pathologic increase in the resistance to aqueous humor outflow from the eye. Currently, the physiological and ultrastructural bases for the generation of aqueous humor outflow resistance remain unclear in both the normal and glaucomatous eye, although experimental evidence …
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Venous haemodynamic and cerebrospinal fluid anomalies associated with multiple sclerosis
… diagnosed with CCSVI, exhibit greatly increased hydraulic resistance of the cerebral venous drainage system; (ii) MS patients experience loss of the small cerebral veins; (iii) MS patients exhibit reduced CSF bulk flow, consistent with mild venous hypertension; (iv) MS patients exhibit increased …
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Fouling mechanisms in the membrane filtration of single and binary protein solutions
… flux is accompanied by rapid increases in hydraulic resistance and the membrane wall concentration. Pore blockage and narrowing occurred at somewhat higher fluxes as indicated by increases in the observed rejection. Fouling was not influenced greatly by the addition of electrolytes for …
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Analytical and experimental studies of plant-flow interaction at multiple scales
… vegetation is often the largest source of hydraulic resistance. Based on a simple momentum balance, we show that the resistance produced by vegetation depends primarily on the fraction of the channel cross-section blocked by vegetation. For the same blockage, the specific distribution of …
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Feedbacks between flow, vegetation, deposition, and the implications for landscape development
… was solved using a porous media formulation for hydraulic resistance, and the velocity in wake regions was adjusted to match the wake structure measured in the laboratory study. Vegetation growth was added based on a probabilistic growth function linked to the velocity field. The simulations …
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Electrochemical Pretreatment for Microfiltration of Surface Water: Mechanisms of Fouling and Its Control
… of colloidal foulants (higher total filtration resistance) and creating larger and more porous flocs (decreasing specific cake resistance). Cathodic production of hydrogen bubbles induced floc flotation over relatively long durations of electrolysis. Such electrochemically assisted flotation - …
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Impact of Percutaneous Transluminal Intervention on Vascular Hypoxia and the Role of Micro-calcifications on Atherosclerotic Plaque Rupture
… the most experience major fold-increases in hydraulic resistance, which could lead to vascular hypoxia, followed by NH. We demonstrated that the presence of one spherical µCalc in the cap tissue is the most influential factor of plaque vulnerability together with the cap thickness. The …
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River - Riparian Vegetation Interactions
… of view vegetation merely affects the roughness, hydraulic resistance, and bank erodibility in the same manner as any a-biotic element with the same mechanical and morphological characteristics. The active role is due to the biotic changes intrinsic to living vegetation. From this point of view, …
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The role of the apoplastic transport barriers for radial water and ion uptake in rice (Oryza sativa L.) and corn (Zea mays L.) roots
For rice, the overall radial hydraulic conductivity (Lpr) was lower than those of other cereal roots. The stele/endodermis, aerenchyma, and the outer part of roots (OPR) arrange in series and their resistances to the overall radial water flow are additive. However, the hydraulic resistance of the …
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