User:Diesel Port Developer/Loss coefficient

Flow Coefficient

Pressure losses in turbulent flow are approximately proportional to the square of flow velocity. A loss coefficient for a pipe, passage or a component is defined as-


 * $$K = {\delta\,P\over\tfrac12\, \rho\, v^{2},}$$

where (using SI units):


 * {| border="0"


 * $$K\;$$   || = loss coefficient (unitless),
 * $$\delta\,P\;$$   || = change in total pressure in pascals,
 * $$\rho\;$$ || = fluid density in kg/m3 (e.g. density of air),
 * $$v\;$$   || = fluid velocity in m/s.
 * }
 * $$\rho\;$$ || = fluid density in kg/m3 (e.g. density of air),
 * $$v\;$$   || = fluid velocity in m/s.
 * }
 * }

A system loss coefficient is defined as the non-dimensional ratio of the total pressure difference when the real component is installed to the total pressure different when there is a zero-loss component. The Pressure Loss is non-dimensionalized by the component's inlet or exit Dynamic Pressure