Download Fluid mechanics by John F Douglas; et al PDF

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 strategy, treating fluid mechanics as a really cross-disciplinary topic.

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

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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.

Dimensions: ML−1T −2. 3 PASCAL’S LAW FOR PRESSURE AT A POINT By considering the equilibrium of a small fluid element in the form of a triangular prism surrounding a point in the fluid (Fig. 3), a relationship can be established between the pressures px in the x direction, py in the y direction and ps normal to any plane inclined at any angle θ to the horizontal at this point. 3 Equality of pressure in all directions at a point If the fluid is at rest, px will act at right angles to the plane ABFE, py at right angles to CDEF and ps at right angles to ABCD.

B) Variation of potential energy with separation 1. 2. 3. If two pieces of the same material are far apart, there is no detectable force exerted between them. Thus, the forces between molecules are negligible when widely separated and tend to zero as the separation tends towards infinity. Two pieces of the same material can be made to weld together if they are forced into very close contact. Under these conditions, the forces between the molecules are attractive when the separation is very small.

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