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EPTT 2020
12th Spring School on Transition and Turbulence
TURBULENT FORCED CONVECTION IN THE THERMAL ENTRANCE OF RECTANGULAR DUCTS: ANALYSIS FOR DIFFERENT MODELS OF VELOCITY DISTRIBUTION AND MOMENTUM EDDY DIFFUSIVITY
Submission Author:
Dhiego Veloso , PB , Brazil
Co-Authors:
Dhiego Veloso, Carlos Antonio Cabral Santos, Fábio Lima
Presenter: Dhiego Veloso
doi://10.26678/ABCM.EPTT2020.EPT20-0114
Abstract
This work describes a hybrid solution (analytical-numerical) for the heat transfer by forced convection in the entry section of a rectangular duct, considering the turbulent flow of dynamically developed and thermally developing Newtonian fluids. The energy equation is solved using the Classical Integral Transform Technique (CITT), while the associated eigenvalue problem is solved using the Generalized Integral Transform Technique (GITT). Different turbulence models with different formulations for velocity distribution and momentum eddy diffusivity are considered. The temperature field and the local Nusselt number are evaluated for various values of the Reynolds and Prandtl numbers. For each turbulence model considered, the thermal input length is determined. The results, presented in the form of tables and graphs, are compared with reference values in the specialized literature.
Keywords
Turbulent flow, CITT, GITT, temperature field, Nusselt number
