![1P1, 2013-14, Thermofluid Mechanics: examples paper 2](http://s1.studyres.com/store/data/017740796_1-3b5dcc09c8d37dd8c18c8ee01b2f32f7-300x300.png)
fluid-1
... In other words, which profile produces more frictional drag against the motion of the solid surface? ...
... In other words, which profile produces more frictional drag against the motion of the solid surface? ...
pr04Tsol
... lower viscosity is used, as viscosity increases when oil cools. In hot climates a more viscous oil is used. b. Rowing would not be possible, just as walking would not be possible if there were no friction. You would have a very limited reaction force, and not get very far. Like rowing, flying would ...
... lower viscosity is used, as viscosity increases when oil cools. In hot climates a more viscous oil is used. b. Rowing would not be possible, just as walking would not be possible if there were no friction. You would have a very limited reaction force, and not get very far. Like rowing, flying would ...
Presentation
... • Expansion waves are created by the interaction of multiple shock waves and convex corners • They cause a continuous change in the supersonic flow of the air. • Density, pressure and temperature ratios decrease through the expansion wave while the Mach number increases • Act like gradient index len ...
... • Expansion waves are created by the interaction of multiple shock waves and convex corners • They cause a continuous change in the supersonic flow of the air. • Density, pressure and temperature ratios decrease through the expansion wave while the Mach number increases • Act like gradient index len ...
sensors homework 3
... surroundings. Heat transfer depends on the flow velocity. The flow field information around the surface of an object could be divided into two components, that is, the normal pressure exerted on the surface and the shear stress along the surface. Both of the components are useful for inferring the f ...
... surroundings. Heat transfer depends on the flow velocity. The flow field information around the surface of an object could be divided into two components, that is, the normal pressure exerted on the surface and the shear stress along the surface. Both of the components are useful for inferring the f ...
Principles of Convection
... Classification of Fluid Flows 1) Viscous versus Inviscid Regions of Flow # When 2 fluid layers move relatively to each other, a friction force develops between them & the slower layer tries to slow down the faster layer. This internal resistance to flow is quantified by the fluid property viscosi ...
... Classification of Fluid Flows 1) Viscous versus Inviscid Regions of Flow # When 2 fluid layers move relatively to each other, a friction force develops between them & the slower layer tries to slow down the faster layer. This internal resistance to flow is quantified by the fluid property viscosi ...
3Feb05_lec
... Where D = depth and gD = speed (celerity) of the gravitational wave. Fr >1 occurs in fast and/or shallow flows; Fr <1 occurs in slow and/or deep flows) What is a gravity wave? Throw a stone into a standing body of water and watch the waves move out in concentric paths – this is a gravity wave; now t ...
... Where D = depth and gD = speed (celerity) of the gravitational wave. Fr >1 occurs in fast and/or shallow flows; Fr <1 occurs in slow and/or deep flows) What is a gravity wave? Throw a stone into a standing body of water and watch the waves move out in concentric paths – this is a gravity wave; now t ...
Determination of viscosity with Ostwald viscometer
... Let us consider two plates having the same area, laying parallel to each other: let the space between them be filled with a fluid (either gas or liquid). If the upper plate is dragged by a force F in the y direction, then it shall move with a constant vy velocity. So the plate will move with a const ...
... Let us consider two plates having the same area, laying parallel to each other: let the space between them be filled with a fluid (either gas or liquid). If the upper plate is dragged by a force F in the y direction, then it shall move with a constant vy velocity. So the plate will move with a const ...
turbulent flow - SNS Courseware
... 4. mgt 15. If the fluid has constant density then it is said to be ...
... 4. mgt 15. If the fluid has constant density then it is said to be ...
Sediment-induced stratification and density current in
... entrainment for a period of 4.5 h around high water and moved with an average velocity of 0.08 m/s in ebb direction, with a peak velocity of 0.12 m/s above the fluid mud surface, directly following flow reversal (III). This ebb directed density current is seen as the combined effect of the downstrea ...
... entrainment for a period of 4.5 h around high water and moved with an average velocity of 0.08 m/s in ebb direction, with a peak velocity of 0.12 m/s above the fluid mud surface, directly following flow reversal (III). This ebb directed density current is seen as the combined effect of the downstrea ...
Boundary layer
![](https://commons.wikimedia.org/wiki/Special:FilePath/Boundarylayer.png?width=300)
In physics and fluid mechanics, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. In the Earth's atmosphere, the atmospheric boundary layer is the air layer near the ground affected by diurnal heat, moisture or momentum transfer to or from the surface. On an aircraft wing the boundary layer is the part of the flow close to the wing, where viscous forces distort the surrounding non-viscous flow. See Reynolds number.Laminar boundary layers can be loosely classified according to their structure and the circumstances under which they are created. The thin shear layer which develops on an oscillating body is an example of a Stokes boundary layer, while the Blasius boundary layer refers to the well-known similarity solution near an attached flat plate held in an oncoming unidirectional flow. When a fluid rotates and viscous forces are balanced by the Coriolis effect (rather than convective inertia), an Ekman layer forms. In the theory of heat transfer, a thermal boundary layer occurs. A surface can have multiple types of boundary layer simultaneously.The viscous nature of airflow reduces the local velocities on a surface and is responsible for skin friction. The layer of air over the wing's surface that is slowed down or stopped by viscosity, is the boundary layer. There are two different types of boundary layer flow: laminar and turbulent.Laminar Boundary Layer FlowThe laminar boundary is a very smooth flow, while the turbulent boundary layer contains swirls or ""eddies."" The laminar flow creates less skin friction drag than the turbulent flow, but is less stable. Boundary layer flow over a wing surface begins as a smooth laminar flow. As the flow continues back from the leading edge, the laminar boundary layer increases in thickness.Turbulent Boundary Layer FlowAt some distance back from the leading edge, the smooth laminar flow breaks down and transitions to a turbulent flow. From a drag standpoint, it is advisable to have the transition from laminar to turbulent flow as far aft on the wing as possible, or have a large amount of the wing surface within the laminar portion of the boundary layer. The low energy laminar flow, however, tends to break down more suddenly than the turbulent layer.