Dimensional Numbers

Reynolds number signifies the ratio of

• gravity forces top viscous forces

• inertial forces to viscous forces

• inertia forces to gravity forces

• buoyant forces to inertia forces

Which of the following dimensionless number gives an indication of the ratio of internal (conduction) resistance to the surface (convective) resistance?

• Biot number

• Fourier number

• Stanton number

• Nusselt number

Fourier number is given by

• α T/L_C²

• 2α T/L_C²

• 3α T/L_C²

• 4α T/L_C²

Reynolds number is

• D v ƥ / μ

• D v μ / ƥ

• D L v / ƥ

• D v L / μ

prandtl number

• μ C_p / k

• ρ ν C_p / k

• ν / α

Nu

• h L / k

• D L / k

• h / L k

• h k / L

Stanton number

• h / C_p ρ v

• h / ρ v

• k / C_p ρ

• h / _μ ρ v

St

• Nu / (Re * Pr)

• Re / (Nu * Pr)

• Pr / (Nu*Re)

• Pe / ( Re * Nu)

Pe

• Pr * Re

• Pr * Nu

• Nu * Re

• St * Nu

Gz

• Pe (D π / 4)

• Pe ( D/4)

• Pr (D π / 4)

• Pr (D / 4)