EXAMPLES ABOUT CLEAN BEDHEADLOSS CALCULATIONS IN FILTERS

A$)$ SINGLE MEDIUM FILTERS

Example #$1$ : Headloss across a bed of uniform size particles

Water at $20C$ is passed through a bed of uniform sand at a filtering velocity of $5\frac{m}{h}r.$ The sand grains are $0\mathrm{.}4mm$ in diameter with a shape factor of $0\mathrm{.}85$ and a specific gravity of $2\mathrm{.}65.$ The depth of bed is $0\mathrm{.}67m$ and the porosity $0\mathrm{.}4.$ Determine the headloss through the bed.

at $20C$;$=1\mathrm{.}002{10}^{-3}k\frac{g}{m}*sec,=998\mathrm{.}2k\frac{g}{m^3}$