Results 231 to 240 of about 4,208,553 (288)
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Adaptation to natural flow regimes
Trends in Ecology & Evolution, 2004Floods and droughts are important features of most running water ecosystems, but the alteration of natural flow regimes by recent human activities, such as dam building, raises questions related to both evolution and conservation. Among organisms inhabiting running waters, what adaptations exist for surviving floods and droughts?
David A, Lytle, N Leroy, Poff
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A new flow regime in a Taylor–Couette flow
Physics of Fluids, 1998In this Brief Communication, we report a new finding on a Taylor–Couette flow in which the outer cylinder is stationary and the inner cylinder is accelerated linearly from rest to a desired speed. The results show that when the acceleration (dRe/dt) is higher than a critical value of about 2.2 s−1, there exists a new flow regime in which the flow ...
Lim, T.T., Chew, Y.T., Xiao, Q.
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The flow regimes and the pressure-flow relationship in the canine urethra
Neurourology and Urodynamics, 1999Classical fluid dynamics predicts that the pressure difference Deltap between any two points along a fully developed, viscous flow stream is linearly proportional to the flow rate Q (the Poiseuille relation). However, the passive urethral resistance relationship (PURR) widely used in modern urodynamics describes the pressure difference Deltap between ...
H S, Lecamwasam +3 more
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Sedimentology, 1977
ABSTRACTThe Bingham model has been suggested for the rheological behaviour of debris flow. Velocity plotted against yield strength uniquely defines turbulent and laminar flow in published experimental data on flow of Bingham materials. These regimes are not defined by a unique value of the Bingham number even though it includes both of the critical ...
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ABSTRACTThe Bingham model has been suggested for the rheological behaviour of debris flow. Velocity plotted against yield strength uniquely defines turbulent and laminar flow in published experimental data on flow of Bingham materials. These regimes are not defined by a unique value of the Bingham number even though it includes both of the critical ...
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Time Flow in a Noncommutative Regime
International Journal of Theoretical Physics, 2006zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Flow Regime Transition Criteria
2007This chapter presents a review of the existing methods for identification of flow patterns in two-phase flow in pools, adiabatic and nonadiabatic channels, rod bundles and porous structures. An attempt is made to extend this information to be applicable in three-phase flow modeling. In addition the influence of the dynamic fragmentation and coalescence
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Journal of Fluid Mechanics, 1982
Analysis of a considerable body of new data, based upon flow-visualization experiments, reveals a simple criterion for the occurrence of vortex breakdown at a fixed location in a tube: Re B ∼ Ω-3R−1, where Ω is the circulation number, R the ratio of the radial to tangential velocities in the inflow region, and Re B the pipe ...
M. P. Escudier, N. Zehnder
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Analysis of a considerable body of new data, based upon flow-visualization experiments, reveals a simple criterion for the occurrence of vortex breakdown at a fixed location in a tube: Re B ∼ Ω-3R−1, where Ω is the circulation number, R the ratio of the radial to tangential velocities in the inflow region, and Re B the pipe ...
M. P. Escudier, N. Zehnder
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Journal of Waterway, Port, Coastal, and Ocean Engineering, 1985
A regime of flow is defined as the transition from laminar to turbulent flow which is an inception of turbulence in the flow field. Knowledge of flow regime provides useful information for quantitative description of flow and its analysis. It also serves as the lower limit of sediment transport.
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A regime of flow is defined as the transition from laminar to turbulent flow which is an inception of turbulence in the flow field. Knowledge of flow regime provides useful information for quantitative description of flow and its analysis. It also serves as the lower limit of sediment transport.
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