Lower mass change rates can also be explained by the insulation effect of bubbles covering the surface from frying medium (Farkas and Hubbard, 2000). This stage is the transition boiling where the lower thermal conductivity vapor covers the product’s surface, and the decreased heat flux values lead to lower heat transfer rate and heat transfer coefficient. Similar behavior in the heat transfer coefficient was also observed by Costa et al. (1999), Hubbard and Farkas (1999) and Farinu and Baik (2007) where