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Extra resources for A First Course in Fluid Mechanics for Engineers

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This reduces the number of variables to consider in a given problem. com 54 A first course in Fluid Mechanics for Engineers Basics of Fluid Flow 4 Basics of Fluid Flow Introduction In the previous lecture on fluid statics we have discussed the fluid at rest. In this section we discuss about fluid flow and some concepts associated with flowing fluids. Given that the gasses are incompressible, the concepts discussed here apply to both liquids and gasses. Characteristics of flowing fluid have generated lot of interest over time.

One unit can be converted to another using conversion factors. To remove the ambiguity of various unit systems most of the countries now have adopted the International System of Units or SI system (the term SI originate from the French Système international d›unités). The SI system defines units for 7 primary physical quantities. It also uses the base of ten in measurements rather than odd numbers relating larger measuring unit to smaller units. 1. 1). Most commonly used dimensions are length [L], Mass [M], and time [T] and is referred to as MKS (meter-kilogram-seconds) system.

Mass having the dimension M and the acceleration LT-2, the product gives MLT-2 the units as same as the left hand side. This balance of dimensions in derived equations is known as the principle of dimensional homogeneity. All the equations derived using first principles of physics and mechanics have this agreement in dimensions. If the equations have additive terms all the terms must have same dimensions. For example consider simple equation of motion that gives the distance a body would travel in time t starting at a distance s0 and travelling at a velocity v with an acceleration a.

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