Experimental study of convective exchange in a low aspect ratio perforation: Application to cooling of multiperforated wall

This work presents an experimental study pertaining to convective transfer in pipes with a square-edged inlet simulating the perforation of a multiperforated wall. The experiments were performed for a range of Reynolds numbers from 3000 to 35,000 and an aspect ratio from 2 to 8. The results achieved have allowed us to characterize the different flow areas within the pipe: takeoff, landing, and developed; they have also enabled us to highlight the influence of aerothermic (Re) and geometric (ℓ/d, type of inlet and number of perforations) parameters. We are likewise proposing correlations allowing for determination of the convective exchange coefficient from preliminarily underscored characteristic points (maximum, minimum and established) in the perforation.