Abstract
The two-equation `low Reynolds number' k-ɛ model of turbulence with a set of universal constants suggested by Launder and Sharma is modified in the present paper. The variability of the turbulent Prandtl number Prt in the energy equation is assumed along with a change of a constant in the dissipation term of the turbulent kinetic energy equation. The turbulent heat transfer is computed for an air flow in a circular pipe for the Reynolds number within the range of 104 < Re < 6.104. The modification considerably improves the agreement between the numerical results and the experiment data published in the available literature.
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