The resistance coefficients are in most cases found through practical tests and through vendor specification documents. If you have valves, elbows and other elements along your pipe then you calculate the pressure drop with resistance coefficients specifically for the element. Surface Materialĭetermine Pressure drop in circular pipes: the Reynolds number to create a Moody Chart.įollowing table gives typical roughness values in millimeters for commonly used piping materials. ![]() The solutions to this calculation is plotted vs. Note: Perfectly smooth pipes will have a roughness of zero.ĭetermine Pipe friction coefficient at turbulent flow (in the most cases) Colbrook Equation: ![]() The friction factor for laminar flow condition is a function of Reynolds number only, for turbulent flow it is also a function of the characteristics of the pipe wall.ĭetermine Pipe friction coefficient at laminar flow: The pipe friction coefficient is a dimensionless number. The pressure drop caused by friction of turbulent flow depends on the roughness of pipe. The velocity distribution of turbulent flow is more uniform across the pipe diameter than in laminar flow. There is an irregular motion of fluid particles in directions transverse to the direction of the main flow. If the Reynolds number 2320, you have turbulent flow. Kinematic Viscosity Table Chart of Liquids
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