Boundary Layers, Separation, and Drag - MIT OpenCourseWare
This section provides readings, class notes, videos seen during class, and problems with solutions for two lectures on boundary layers, separation, and drag.
• Flow around a body • Boundary layer develops freely without constraints from the geometry Internal Flows: • Flow inside a body • Boundary layer is unable to develop without eventually being constrained Eg. Cylinder flow Eg. Pipe flow Laminar Flow over a Flat Plate • Simplest external flow • We’ll solve this flow numerically ...
Applications of BL theory: aerodynamics (airplanes, rockets, projectiles), hydrodynamics (ships, submarines, torpedoes), transportation (automobiles, trucks, cycles), wind engineering (buildings, bridges, water towers), and ocean engineering (buoys, breakwaters, cables). 99% …
Hot Wire Anemometry is used to measure the velocity profile inside the boundary layer along the flat plate. A flap at the trailing edge of the flat plate is used to ensure that leading edge of the plate is at zero degree angle of attack. From the experiments it is concluded that the measured velocity profiles fit Blasius’ solution.
With these results, we can determine local boundary layer thickness, local wall shear stress, and total drag force for laminar flow over a flat plate. Air flows over a sharp edged flat plate with L = 1 m, a width of 3 m and U∞ = 2 m/s . For one side of the plate, find: δ(L), Cf (L), τw(L), CD, and FD.
Boundary Layer on a Flat Plate - University of Texas at Austin
The fluid flow outside the boundary layers remains effectively inviscid, whereas that inside the layers is modified by viscosity. It follows that the flow external to the layers is unaffected by the presence of the plate. Hence, the tangential velocity at the outer edge of the boundary layers is .
In a thin region near the surface of the object, called the boundary layer, viscous effects cannot be neglected, and are as important as inertia. The pressure variation can be calculated from the potential flow solution along the surface of the object, neglecting viscous effects altogether, and assumed to be impressed upon the boundary layer.
For two-dimensional, steady, incompressible flow with zero pressure gradient, the governing equations of motion (Eqs. 5.27) re-duce to [3] Equations 9.3 and 9.4, with boundary conditions Eq. 9.5 are a set of nonlinear, cou-pled, partial differential equations for the unknown velocity field u …
Flow patterns and pressure drop in the shell-and-plate
2020年8月1日 · Flow patterns and pressure drop of gas-water two-phase flow in a transparent circular plate with a corrugated sinusoidal shape are analyzed in detail. We also discuss the flow pattern transition mechanisms and propose two-phase friction pressure drop correlations based on the experiment results.
Basics of Orifice Plates - Instrumentation Tools - Inst Tools
Of all the pressure-based flow elements in existence, the most common is the orifice plate. This is simply a metal plate with a hole in the middle for fluid to flow through. Orifice plates are typically sandwiched between two flanges of a pipe joint, allowing for easy installation and removal:
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