The question gives this .. The Reynolds number, Re, is a dimensionless group which characterizes the intensity of a flow. For large Re, a flow is turbulent; for small Re , it is laminar. For pipe flow, Re=u(density)D/mu, where D is pipe diameter and mu is dynamic viscosity. It asks .. If D and mu are fixed, what is the effect of increasing mass flow rate on Re? and If mass flow rate and mu are fixed, what is the effect of increasing D on Re? Any help is appreciated, Thanks!!