Fluid Fluid Mechanics Review
Properties Properties Involving Mass or Weight of Water
Mass Density (often called density) mass per unit volume kg/m3 = 1000 kg/m3 at 4 oC
Specific Weight Gravitational force (weight) per unit volume of water = 9810 N/m3 ( or
A Brief Summary of Drag Calculations for a Flat Plate
Local Parameters
1. Calculate Reynolds Number at location of interest. For local parameters this is based
on the viscosity of the fluid (), the distance of the location from the plates leading
edge (x)
How to Find Equivalent Forces From a Physical Model
Example: I have a 1:10 scale physical model of a prototype. That is, the model is 10 times
smaller than the prototype. Lets say that I measure a force of 10 N on a wall in the model, what
is the equivale
Velocity Distributions and Friction Factors
Definitions:
Re is the Reynolds number of the pipe (VD/)
u* is the shear velocity (also called the friction velocity).
u * = 0 where 0 is the wall shear stress.
Laminar pipe flows (Re < 2000)
1. Velocity distrib
1.5
1.3 For the triangular element in Fig. Pl .3.
show that a tilted free liquid surface. in
contact with an atmosphere at pressure pa.
must undergo shear stress and hence begin
to flow.
Solution: Assume zero shear. Due to
element weight. the pressure alo