A Brief Introduction to Fluid Mechanics, Fifth Edition by Donald F. Young, Bruce R. Munson, Theodore H. Okiishi, Wade

By Donald F. Young, Bruce R. Munson, Theodore H. Okiishi, Wade W. Huebsch

A short advent to Fluid Mechanics, fifth variation is designed to hide the normal subject matters in a easy fluid mechanics direction in a streamlined demeanour that meets the training wishes of today?s pupil higher than the dense, encyclopedic demeanour of conventional texts. This strategy is helping scholars attach the maths and conception to the actual global and sensible purposes and follow those connections to fixing difficulties. The textual content lucidly provides uncomplicated research suggestions and addresses functional issues and purposes, similar to pipe movement, open-channel stream, movement dimension, and drag and raise. It deals a powerful visible technique with photographs, illustrations, and movies integrated within the textual content, examples and homework difficulties to stress the sensible program of fluid mechanics ideas

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3) would rotate through an angle, ␦␤, so that tan ␦␤ Ϸ ␦␤ ϭ ␦a b Since ␦a ϭ U ␦t, it follows that ␦␤ ϭ U ␦t b Note that in this case, ␦␤ is a function not only of the force P (which governs U) but also of # time. 4 Linear variation of shearing stress with rate of shearing strain for common fluids. 6 NonNewtonian behavior F l u where the constant of proportionality is designated by the Greek symbol ␮ (mu) and is called the absolute viscosity, dynamic viscosity, or simply the viscosity of the fluid.

A quick check of the dimensions of the various terms in an equation is a useful practice and will often be helpful in eliminating errors—that is, as noted previously, all physically meaningful equations must be dimensionally homogeneous. We have briefly alluded to units in this example, and this important topic will be considered in more detail in the next section. 1 Systems of Units In addition to the qualitative description of the various quantities of interest, it is generally necessary to have a quantitative measure of any given quantity.

Viscosity is only mildly dependent on pressure, and the effect of pressure is usually neglected. However, as mentioned previously, and as illustrated in Appendix B (Figs. 2), viscosity is very sensitive to temperature. Quite often viscosity appears in fluid flow problems combined with the density in the form ␯ϭ ␮ ␳ This ratio is called the kinematic viscosity and is denoted with the Greek symbol ␯ (nu). The dimensions of kinematic viscosity are L2/T, and the BG units are ft2/s and SI units are m2/s.

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