A laboratory scale experimental set up for this research was developed in Ningbo Scientz Biotechnology Co., Ltd., China,which specialized in the production of different ultrasonic equipment. A schematic diagram of the freezing equipment used for this work is shown in Fig. 1. The freezing equipment consists of the following eight basic sections: (1) a stainless steel freezing set up with a length of 150 cm, a breadth of
65 cm and a height of 65 cm (freezing tank: 30 cm 22 cm 26 cm). The outer walls of the freezing tank were wrapped with insulation material to minimize heat transfer from surrounding during freezing process;