Experimental and numerical investigation of turbulent heat transfer in a channel with periodically arranged rib roughness elements Original Research Article

Experimental and numerical results of local heat transfer coefficients on the rib-roughened wall of a channel with turbulent flow with Reynolds number of 6000 based on channel height are compared. The numerical results have been obtained from large eddy simulation (LES) and the experimental results from ammonia-absorption technique. Numerical computations have been done for a periodic element of the channel with periodically fully developed flow. Although the experiments even after the eighth period did not show an exact periodically fully developed condition, the experimental and numerical results show good agreement.