.TRANSFORM.Fluid.ClosureRelations.PressureLoss.Functions.TubesAndConduits.SinglePhase.LaminarTurbulent_ReynoldsRelation

Information

This component defines the complete regime of wall friction. The details are described in the UsersGuide. The functional relationship of the friction loss factor λ is displayed in the next figure. Function dp_DP() defines the "red curve" ("Swamee and Jain"), where as function dp_MFLOW() defines the "blue curve" ("Colebrook-White"). The two functions are inverses from each other and give slightly different results in the transition region between Re = 1500 .. 4000, in order to get explicit equations without solving a non-linear equation.

Additionally to wall friction, this component properly implements static head. With respect to the latter, two cases can be distinguished. In the case shown next, the change of elevation with the path from a to b has the opposite sign of the change of density.

In the case illustrated second, the change of elevation with the path from a to b has the same sign of the change of density.

Contents

Name	Description
dp_IN_var	Input record for function dp_DP and dp_MFLOW
dp_IN_con	Input record for function dp_DP and dp_MFLOW
dp_DP	calculate pressure loss
dp_MFLOW	calculate mass flow rate
dp_DP_staticHead	calculate pressure loss with static head
dp_MFLOW_staticHead	calculate mass flow rate with static head
Internal	Functions to calculate mass flow rate from friction pressure drop and vice versa