Formules PTP midterm 2

Pr

(Cp x µ)/k

Nusselt

(h x d)/k d = diameter pipe

heat energy transfered with fase verandering

q = m^ x h,fg (q in w)

Fouriers Law for conduction

q = k x A x Delta T (q = W)

or q’’ = k/L x (Delta T) (q = W/m²)

or q’’ = -k x dT/dx → qL/2

Newtons law for convection

q = h A (Delta T) (q = W)

or q’’ = h(Delta T) (q = W/m²)

Re

(p x v x d)/µ

Thermal resistance q

q = (Delta T)/Rt (q = W)

Rconduction

L/kA

Rconvection/radiation

1/hA

Rcyllindrical

Rspherical

Flow rate Oil opdracht

Without friction flow rate

v = wortel(2gh) en dan q = A x v

Power pump

delta pressure x flow rate

Skin opgave Ts