$-5$

An electrostatic. preqipitator tor use with Standand ais contaiming dust pasticies of $14m$ dia is in the form of a cycindei with $0\mathrm{.}4m$ dia and $2\mathrm{.}0m$ cony. The Volumetric flow Rate of ais is $0\mathrm{.}075\frac{m^3}{s}.$ if the electric field Stresgtr is $5000\frac{v}{m}$ and if the Particul charfe is $0\mathrm{.}3{10}^{-15}$ coulsmb. Compute the collection efficiency. the viscosity of $\frac{a}{2}$ is $1\mathrm{.}81{10}^{-5}k\frac{y}{m.s}.$