CHEN 3005 Lecture 9: Lecture 932014.pdf
8 Sep 2014
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Physical properties: perry"s handbook (free pdf from library) Def: density isn"t a function of temperature or pressure. T (degrees c) p (mpa) density (row) (kg/m3) 674 example of incompressible gas: ideal gas --> pv = nrt molar density: n/v = p/(rt) Hydrostatics (study of fluids that don"t move) imagine that you have a cube don"t have to worry about spatial position with density. Fb + fs = ma = 0 since at rest body forces + surface forces = mass*acceleration = 0 vectors are underlined. Chen transport page 1 unit vector but doesn"t have units. Surface force let"s focus on top surface of box normal vector. |n| = 1 looking for force acting on things inside the box. Left face: location is at (x,y,z) normal vector points in minus x direction: -ix. Right face: location: (x + x, y, z) normal: +ix. Top face: location: (x, y+ y, z) normal: +iy.
