Law of the wall for two-phase turbulent boundary layers

A two-phase logarithmic law of the wall for isothermal bubbly turbulent bou ndary layer is developed. Total boundary layer liquid turbulent stress is e stimated by the sum of bubble induced local stress and sheer induced stress . Boussinesq turbulent viscosity approximation is assumed to be valid for b oth stress components. A proportionality coefficient was introduced to acco unt for inherently non-linear interaction between shear and bubble induced turbulence fields. The two-phase wall law was implemented in CFX4.2 computa tional fluid dynamics program. A better agreement with experimental data wa s achieved when the new wall law was employed rather than conventional sing le-phase law. (C) 2001 Elsevier Science Ltd. All rights reserved.