This product is based on the fundamental theory of phase change convection in heat transfer, and is used in conjunction with the basic experimental platform of heat transfer to study the principle of boiling heat transfer in vertical tubes in "Heat Transfer" and demonstrate the phenomenon of tube boiling. The main body of the device is a concentric tube heat exchanger made of heat-resistant glass. The heat transferred by the hot water flowing through the outer tube of the heat exchanger causes the solvent to boil, demonstrating the possible flow and heat transfer types of liquid boiling inside the vertical tube.