MODULE 3

Section 2:   

Pressure Drop and Friction Factor

Section 3:   

Heat Transfer Coefficient

Section 4: 

Convection With Phase Change 

Two forces act on a fluid in the absence of viscous and field forces: inertia and pressure forces. In this case the balance of forces in a control volume is given by:  

(3.1)

Equation 3.1 is known as Bernoulli Equation and

p = pressure in the fluid 

r = density 

u = fluid velocity 

Applying expression 3.1 for 2 different positions of a fluid flow gives:  

(3.2)

Considering the flow as incompressible (r₁ =  r₂) we conclude that an increase in the flow velocity results in a pressure reduction.

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