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Showing 1 to 20 of 68 for “"flow resistance"”.
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Flow resistance corrections for physical models using unit flowrates
Flow resistance is an essential aspect of evaluating flow behavior in open-channel hydraulic models. Flow resistance in open channels is commonly characterized by Manning's resistance equation, where a value of Manning's roughness coefficient n, indicates the magnitude of flow resistance. Physical …
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Surface water flow resistance due to emergent wetland vegetation
… Dense wetland vegetation affects surface water flow rates by increasing flow resistance. Prior research represented the vegetation as individual stems; however, many wetland species grow in clumps. Therefore, the objectives of this study were to investigate the effect of clumping vegetation on …
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Flow Interaction Between Turbomachine Blade Row and Flow Resistance Medium
… The importance of this research is that the flow interaction effect occurs in every scenario that requires system compactness. </p><p>Firstly, a combined experimental and 3-D computational study on an off-the-shelf server cooling fan is performed, showing that the fan performance has little …
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Turbulence structure and flow resistance in oscillatory boundary layer flows
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-12-01
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Characterizing ash properties and effects on Diesel Particulate Filter flow resistance
… and ash particles creates an increase in the flow resistance of the filter which creates more backpressure on the engine and results in a decrease in fuel economy. Over the life of the filter, the ash particles become a significant portion of particulate matter in the filter and the resulting …
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Characterizing flow resistance in high gradient mountain streams, Fraser Experimental Forest, Colorado
… mountain streams dissipate energy when water flows over poorly sorted grains in the bed and banks and over bedforms such as steps and pools, creating a constant alternation between supercritical and subcritical flow and causing energy dissipation through hydraulic jumps. Mountain streams (bed …
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Synergistic effects of lubricant additive chemistry on ash properties impacting diesel particulate filter flow resistance and catalyst performance
… accumulates over time leading to increased flow restriction thus a pressure drop across the filter. An increased pressure drop negatively affects the engine performance & fuel economy leading to the need for filter removal and cleaning. The adverse effects of ash accumulation on DPF …
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
The presence of vegetation in open channel flow has a significant influence on flow resistance, turbulence structures and sediment transport. This study will evaluate flow resistance and scale velocity profile in depth limited flow conditions, specifically investigating the impact of vegetation on …
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
The presence of vegetation in open channel flow has a significant influence on flow resistance, turbulence structures and sediment transport. This study will evaluate flow resistance and scale velocity profile in depth limited flow conditions, specifically investigating the impact of vegetation on …
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Analytical and Numerical Models for Velocity Profile in Vegetated Open-Channel Flows
The presence of vegetation in open channel flow has a significant influence on flow resistance, turbulence structures and sediment transport. This study will evaluate flow resistance and scale velocity profile in depth limited flow conditions, specifically investigating the impact of vegetation on …
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Building Envelope Wind Pressure Manipulation for Application in Streamlined High-Rise Buildings
… indicates that the use of externally mounted flow-resistance devices is an effective method of manipulating the wind pressure distribution. It is demonstrated that this technique is well suited for application to buildings of streamlined cross-section (e.g. elliptical planform). Next, a 3-D …
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Experimental Investigation of Liquid and Particle -Laden Flows in Microtubes
Since flow blockages are the ultimate form of increased flow resistance, the research emphasis is focused on the mechanisms that lead to blockage. Different blockage mechanisms are observed in different regimes defined by the ratio of particle diameter to tube diameter. For example, for 0.33 D < dp …
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The hydraulic and hydrological performance of large wood accumulation in a low-order forest stream
… been removed from rivers in order to reduce flow resistance and increase channel conveyance. However, recently there has been an appreciation of the role of large wood accumulations in creating important aquatic habitat, increasing geomorphic diversity, re-connecting river channels to their …
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Interaction among vegetation and morphology in channelized rivers
… on riverbed and embankments influences flow structure and consequently flow resistance, sediment transport, morphology, and ecology. These influences would lead to a hydraulic diversity, which is a key ingredient of physical habitat in streams. According to this fact, vegetation is …
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Modeling Low Flow Hydraulics in Alluvial Channels (pools-Riffles, Open)
The investigation of the flow condition has become important in recent years as a means of determining critical levels of water pollution, aquatic habitat and instream flow needs. To assess these critical conditions, it is necessary to predict the hydraulic response of a river system to a given low …
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An experimental investigation of instability in turbulent-flow freezing
… of a fully developed turbulent internal flow due to external cooling of the tube wall was conducted. A region of unstable freezing behavior was located and bounded in terms of initial Reynolds number and a nondimensional temperature parameter for the given system. This region was observed …
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Application of cepstral signal processing techniques and a guard tube to the in-situ measurement of the normal incidence sound absorption coefficient
… wave absorption for a decrease in the specific flow resistance of the material. Measurements with the Guard Tube were then conducted on selected homogenous materials. Owing to the non-availability of porous asphalt surfaces and bored core specimens, the investigation was limited to more common …
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An experimental study of nanobubbles on hydrophobic surfaces
… of microfluidic systems, miniaturization of flow devices has become a real challenge. Microchannels, however, are characterized by a large surface area-to-volume ratio so that surface properties strongly affect flow resistance in sub-micrometer devices. Recent studies in the literature have …
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Investigation of heat transfer in metal-foam tubes
… the performance of forced convection and flow boiling heat transfer in metal-foam tubes has been investigated experimentally and theoretically. Compared to those of plain tubes, the research results reveal that the use of metal foam can significantly enhance heat transfer capabilities due …
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