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Flow Resistance Equations
Published in Ahlam I. Shalaby, Fluid Mechanics for Civil and Environmental Engineers, 2018
The results sought in a given flow analysis will depend upon whether the flow is internal or external. In an internal flow, energy or work is used to move/force the fluid through a conduit. Thus, one is interested in the determination of the forces (reaction forces, pressure drops, flow depths), energy or head losses, and cavitation where energy is dissipated. In pipe flow, the conduit is completely filled with fluid and the flow is mainly a result of invoking a pressure difference (pressure drop, Δp). However, in open channel flow, the conduit is only partially filled with fluid and the flow is a result of invoking only gravity. In an external flow, energy or work is used to move a submerged body through the fluid, where the fluid is forced to flow over the surface of the body. Thus, one is interested in the determination of the flow pattern around the body, the lift, the drag (resistance to motion) on the body, and the patterns of viscous action in the fluid as it passes around the body.
Fluid Mechanics
Published in Jiro Nagatomi, Eno Essien Ebong, Mechanobiology Handbook, 2018
Tiffany Camp, Richard Figliola
Pipe flow is the general term used to describe flow in closed conduit. The implication is not that all pipes have round cross sections. This topic involves flow through piping, whether it be water in pipes, air through duct work, or natural gas in pipe work supplying a home. The understanding of pumping systems is commonly included in the study of pipe flow.
ANSYS: Finite Element Analysis
Published in Paul W. Ross, The Handbook of Software for Engineers and Scientists, 2018
Pipe Flow. Pipe flow analysis is used to determine pressures, velocities, and heat-exchange characteristics of a fluid in a closed system, such as a water supply piping network. It is applicable for any system with a constant flow rate of an incompressible fluid.
Closure to “Influence of erosion on piping in terms of field conditions” by GIJS HOFFMANS, J. Hydraulic Res. 59(3), 512–522. 2020. https://doi.org/10.1080/00221686.2020.1786741
Published in Journal of Hydraulic Research, 2023
DgFlow fulfils the fundamental groundwater flow and pipe flow equations. Moreover, the wall shear stresses equal their critical values. However, there are indications that DgFlow lacks the fundamentals of fluid mechanics as well as morphodynamics, especially for river dikes and large dams. Therefore, we discuss (1) transitional pipe flow, (2) scaling effects, (3) boundary conditions, (4) cover layer, (5) critical pipe velocity, (6) gradation and (7) suffusion. Then, we discuss 2D and 3D groundwater modelling; last, conclusions and recommendations are drawn.
Numerical analysis of the hydraulic transient in a closed pipe in presence of a bypass valve
Published in ISH Journal of Hydraulic Engineering, 2020
For large water supply systems, transient analysis of pipe flow is often more important than the analysis of steady-state operating conditions, usually considered for system design, because it helps in considering the effects of additional loads due to rapid valve closures (Wood 2005; Nerella and Rathnam 2015).