Verification of Models for Turbulent Heat Fluxes in the Flow over a Rectangular Rib on a Plate

In this paper, verification of several turbulent heat flux models for the calculation of the plane turbulent heat transfer near a rectangular rib on a plate is presented. These models are included in simple zero-equation models and in complex models (two-parameter dissipative models, explicit algebraic models and differential model). The simulation is performed using ANSYS Fluent software package with the inclusion of UDF (User Defined Function). The calculation results are compared with the experimental profiles of velocity and temperature, and their turbulent characteristics. The results of numerical studies show that zero-equation models under the condition of the constant turbulent Prandtl number are not able to reproduce the character of the temperature field in the separation zone, and complex models provide more accurate predictions not only for the temperature field but also for the distribution of the heat transfer coefficient on the surface with a rib.

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