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

A quick advent to Fluid Mechanics, fifth variation is designed to hide the normal issues in a easy fluid mechanics direction in a streamlined demeanour that meets the training wishes of today?s scholar larger than the dense, encyclopedic demeanour of conventional texts. This procedure 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 offers easy research concepts and addresses functional matters and functions, corresponding to pipe circulation, open-channel movement, circulation size, and drag and raise. It deals a robust visible strategy 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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7 Compressibility of Fluids 19 SOLUTION For an isentropic compression pf pi ϭ k k ␳i ␳f where the subscripts i and f refer to initial and final states, respectively. Since we are interested in the final pressure, pf , it follows that ␳f k pf ϭ a b pi ␳i As the volume, V, is reduced by one-half, the density must double, since the mass, m ϭ ␳ V, of the gas remains constant. 8 psi 1abs2 (Ans) COMMENT By repeating the calculations for various values of the ratio of the final volume to the initial volume, Vf րVi, the results shown in Fig.

7. 6 15 Viscosity at these tables reveals the wide variation in viscosity among fluids. 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.

This is illustrated by the figure in the margin. Thus, the density of mercury can thus be readily calculated in either BG or SI units through the use of Eq. 6 ϫ 103 kg/m3 It is clear that density, specific weight, and specific gravity are all interrelated, and from a knowledge of any one of the three the others can be calculated. 5 Ideal Gas Law 11 TA B L E 1 . ) TA B L E 1 . 7 0 (gage) (abs) p, psi where p is the absolute pressure, ␳ the density, T the absolute temperature,1 and R is a gas constant.

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