Aeronautical Engineering

Fluid mechanics by John F Douglas; et al

By John F Douglas; et al

This paintings comprehensively covers the statics and dynamics of beverages and gases. Broad-based, it takes an applications-led process, treating fluid mechanics as a very cross-disciplinary topic.

summary: This paintings comprehensively covers the statics and dynamics of drinks and gases. Broad-based, it takes an applications-led technique, treating fluid mechanics as a really cross-disciplinary subject

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46 × 10 −5 m2 s−1. 10 CAUSES OF VISCOSITY IN GASES When a gas flows over a solid boundary, the velocity of flow in the x direction, parallel to the boundary, will change with the distance y, measured perpendicular to the boundary. In Fig. 6, the velocity in the x direction is vx at a distance y from the boundary and vx + δ vx at a distance y + δ y. As the molecules of gas are not rigidly constrained, and cohesive forces are small, there will be a continuous interchange of molecules between adjacent layers which are travelling at different velocities.

9. e. it is used to mean volume per unit mass. 9 VISCOSITY A fluid at rest cannot resist shearing forces, and, if such forces act on a fluid which is in contact with a solid boundary (Fig. 2), the fluid will flow over the boundary in such a way that the particles immediately in contact with the boundary have the same velocity as the boundary, while successive layers of fluid parallel to the boundary move with increasing velocities. Shear stresses opposing the relative motion of these layers are set up, their magnitude depending on the velocity gradient from layer to layer.

G. colloidal solutions, clay, milk, cement). g. quicksand). g. thixotropic jelly paints). Rheopectic materials, for which the dynamic viscosity increases with the time for which shearing forces are applied. Viscoelastic materials, which behave in a manner similar to Newtonian fluids under time-invariant conditions but, if the shear stress changes suddenly, behave as if plastic. The above is a classification of actual fluids. In analyzing some of the problems arising in fluid mechanics we shall have cause to consider the behaviour of an ideal fluid, which is assumed to have no viscosity.

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