The freezing curve for cryogenic
freezing had a steeper slope than the freezing curve for the air blast
freezer due to higher heat loss rate which was correlated to the
higher temperature difference between the catfish fillets temperature
and the ambient temperature in the cryogenic freezer. The
temperature difference between catfish fillet and freezer temperature
for cryogenic freezing was 55.06 C, while it was 21 C for
blast freezing. After the sensible heat region is the latent heat region,
also known as thermal arrest region (