EFFECT OF IMPINGEMENT OVEN FINGER DUCT SHAPE ON JETS VELOCITY

摘要

A point of concern when using air impingement ovens is the wide variation of heat transfer coefficient on the surface of a product.One of the main sources of nonuniformity is non-uniform air distribution of finger duct.Experimental and numerical simulation Results showed that for the desired jet velocity (10 m/s), the average jet velocity of nozzles increased along with finger duct of Oven from 8.8 m/s to its maximum value (13.9 m/s). The difference between maximum and minimum jet velocities was 58%. The horizontal components of velocity increased along with duct that result in higher flow divergence from nozzles exit and consequently lower heat transfer on a product surface.