Heat transfer coefficient for cookie shaped objects in a hot air jet impingement oven

Correlations for average heat transfer coefficient for cookie shaped object s in a hot air jet impingement oven were obtained using aluminum cookie mod els. The study was carried out in a pilot plant scale hot air jet impingeme nt oven. The effects of individual cookie position, presence of surrounding cookies, air velocity, air temperature and rotation of the oven plate on a verage surface heat transfer coefficient were investigated. The value of th e heat transfer coefficient ranged between 100-225 W/m(2)K and was found to be a strong function of jet air velocity. The impact of surrounding cookie s on the heat transfer coefficient was more for smaller cookies, which had larger cookie-to-cookie spacing.