The pressure drop, \(\Delta p\), along a straight pipe of diameter \(D\) has been experimentally studied, and it is observed that for laminar flow of a given fluid and pipe, the pressure drop varies directly with the distance, \(\ell\), between pressure taps. Assume that \(\Delta p\) is a function of \(D\) and \(\ell\), the velocity, \(V\), and the fluid viscosity, \(\mu\). Use dimensional analysis to deduce how the pressure drop varies with pipe diameter.