| Summary: | In the present research work, we introduce a new method for estimating the slip length on superhydrophobic
surfaces. Hence, a dynamic force is added to momentum equations and velocity boundary condition is
rewritten in a new form. Laminar and turbulent channel flows are considered and two force functions are used
with different profiles to investigate their effects on results. The turbulent channel flow is considered at
Re 180 and the Large Eddy Simulation (LES) method has been applied to analyze this flow. All results
indicate that this method can predict the streamwise slip length with a good accuracy, which is comparable
with the Navier’s method. So, using this numerical solution and also measuring pressure drop and mass flow
rate in the channel, slip length can be calculated. Consequently, the errors and difficulties of slip length
measurements in typical methods such as AFM and μPIV would be eliminated.
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