Page 286 - Formulas and Calculations for Petroleum Engineering

Fluid flow and transport phenomena formulas and calculations Chapter 5 279

Formula(s)

v
Ek ¼
2 p
2 D o sin W
180
Reference: Wikipedia.org.

5.49 Elimination of circulation in a rising gas bubble
Input(s)

R: Radius of bubble (cm)
m: Viscosity (cP)
v ∞ : Velocity (cm/s)
y: Angle of bubble (rad)

Output(s)
τ: Stress (kPa)

Formula(s)

3 m v sin yðÞ
∞
τ ¼
2 R
Reference: Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons,
Chapter: 22, Page: 701.

5.50 Energy emitted from the surface of a black body

Input(s)
4
3
S: Stephan-Boltzmann Constant (lb/(hr R ))
2
T: Temperature (R) A: Area (ft )
Output(s)
e 2
(q b ) : Emitted Heat Flux (Btu/h ft )

Formula(s)

e 4
q ðÞ ¼ r T
b
Reference: Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons,
Chapter: 16, Page: 494.

5.51 Estimation of diffusivity of liquids

Input(s)
ø B : Association Number (dimensionless)
T: Temperature (K)