Tubular heat exchangers are also called shell-and-tube heat exchangers. They are the most widely used heat exchangers in the food and beverage processing industry. They can be used for preheating tomato sauce and concentrated juice and sterilizing milk or fruit juice. The tube heat exchanger is mainly composed of a stainless steel cylindrical shell, in the shell are covered with stainless steel parallel tube bundles supported by baffles. The tube bundles are installed on the tube plates at both ends of the shell. The stainless steel tube bundles are corrugated tubes, which have the feature of high heat exchange efficiency, not easy to scale and high heat compensation ability. The material generally goes inside the tube and is called the tube pass; the cold and heat medium usually goes outside the tube and is called the shell pass.