1.
n. [Enhanced Oil Recovery]
A dimensionless group used in analysis of fluid flow that characterizes the ratio of gravitational forces to surface or interfacial tension forces. It is usually denoted N_{b} in the oil field and Bo in chemical engineering. A value of N_{b} <<1 implies the flow in question is only weakly dependent on gravitational forces, whereas N_{b} >>1 implies gravitational forces dominate over interfacial forces.
Bond number equation:
N_{b} = Bo = (Δρ g b^{2}) / σ,
where
N_{b} = Bo = Bond number
Δρ = density difference between the two phases
g = acceleration due to gravity
b = a characteristic length scale of the flow geometry
σ = surface or interfacial tension.