By Yunus A. Cengel, John M. Cimbala
Fluid Mechanics: basics and purposes communicates without delay with tomorrow's engineers in an easy but designated demeanour. The textual content covers the elemental ideas and equations of fluid mechanics within the context of various and various real-world engineering examples. The textual content is helping scholars strengthen an intuitive realizing of fluid mechanics via emphasizing the physics, and by means of offering beautiful figures, a number of pictures and visible aids to enhance the physics.
Read or Download Fluid Mechanics: Fundamentals and Applications (McGraw-Hill Series in Mechanical Engineering) PDF
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Additional info for Fluid Mechanics: Fundamentals and Applications (McGraw-Hill Series in Mechanical Engineering)
Sample text
The systematic efforts to develop a universally acceptable system of units dates back to 1790 when the French National Assembly charged the French Academy of Sciences to come up with such a unit system. An early version of the metric system was soon developed in France, but it did not find universal acceptance until 1875 when The Metric Convention Treaty was prepared and signed by 17 nations, including the United States. In this international treaty, meter and gram were established as the metric units for length and mass, respectively, and a General Conference of Weights and Measures (CGPM) was established that was to meet every six years.
Students are encouraged to always use unity conversion ratios such as those given here when converting units. 174 lbm · ft/lbf · s2 ϭ kg · m/N · s2 ϭ 1 into equations in order to force units to match. This practice leads to unnecessary confusion and is strongly discouraged by the present authors. We recommend that students instead use unity conversion ratios. 00 lbf on earth (Fig. 1–33). lbm FIGURE 1–33 A mass of 1 lbm weighs 1 lbf on earth. 00 lbm is subjected to standard earth gravity. Its weight in lbf is to be determined.
However, the fluid properties vary with time in a periodic manner, and the flow through these devices can still be analyzed as a steady-flow process by using time-averaged values for the properties. Some fascinating visualizations of fluid flow are provided in the book An Album of Fluid Motion by Milton Van Dyke (1982). A nice illustration of an unsteady-flow field is shown in Fig. 1–19, taken from Van Dyke’s book. Figure 1–19a is an instantaneous snapshot from a high-speed motion picture; it reveals large, alternating, swirling, turbulent eddies that are shed into the periodically oscillating wake from the blunt base of the object.