February 21, 2017

FM AND FM

FLUID MECHANICS AND FLUID MACHINES:-

Definition:

Fluid is a substance which is capable of flowing under the action of shear force ,however small is the shear force.

scope of fluid mechanics:

  • designing of ships
  • working of pumps,compressors

Classification of fluids:

  1. Liquids
  2. Gases

Properties of Fluids:

1.DENSITY OR MASS DENSITY (ρ):

  • density is defined as the ratio of mass of fluid to its volume
  • ρ(rho) =mass of fluid(kg) /  Volume of fluid ( m3)
  • ρ of water is 1000 kg/m 3    
  • ρ of mercury is 13600 kg/m 3
  • Dimentional Analysis =   ML-3  
  • it is an absolute quantity i.e it does not change from place to place.

2. SPECIFIC WEIGHT  (w):

  • specific weight is defined as the ratio of weight per unit volume
  • specific weight(w) = weight of fluid (N) / volume of fluid (m 3)
  • w= ρ * g.
  • w of water is 9810 N/m 3
  • Dimentional Analysis =  ML-2 T-2