An analysis of turbulent reactive flows in tubular non-catalytic reactors is presented for various reaction orders and rate constants. A CFD model has been developed to predict the flow pattern in pipe flow using low Reynolds number k-epsilon model. Particular emphasis is placed upon analyzing the phenomena near the wall region. The CFD model has been extended to simulate the axial dispersion phenomena in turbulent regions. Further, the CFD model has been extended to obtain changes in the radial and axial concentration distributions. For the case of thermally neutral reactions and the isothermal conditions, it was observed that the lower order reactions cause a more rapid decrease in the axial concentrations. The effect of Reynolds and Schmidt numbers on the conversion levels is also discussed. (c) 2006 Elsevier B.V. All rights reserved.