# Non Newtonian Fluid Pressure Loss Calculations

FluidFlow provides the user with the option of selecting one of four possible calculation methods for determining pressure loss for Non-Newtonian fluids flowing within a pipe system. The available calculation methods are based on the relationships used to describe the fluid rheology data. It is recommended that the user obtains fluid rheology data prior to making a Non-Newtonian calculation. The available rheology models are: ▪Power Law with the friction factors calculated according to the relationships provided by Ron Darby - Chemical Engineering Fluid Mechanics. ▪Bingham Plastic with friction factors calculated according to the relationships provided in Darby together with the solution of Buckingham Reiner equation. ▪Hershel-Bulkley with friction factors calculated according to the method of Dodge and Metzner. ▪Casson with friction factors calculated according to the method of Wilson Thomas. For calculation of pressure losses across other fluid equipment items the K factor method is used. K factors are adjusted at low Reynolds numbers as recommended by Steffe - Non-Newtonian Flows in the Food Industry