Abstarct: Helical coils are one of the most widely used converters in industry Considering the positive features of using helical coils in heat exchangers Such as less occupation as well as higher heat transfer Much research has been done on the use of different types of helical coils as well as their modeling. Helical coils and generally curved surfaces are widely used in industry. In helical coils, a centrifugal force will be created due to the radius of curvature. This force causes a secondary current to form in these coils. The effects of secondary current on coil coils can be improved by mixing current, Increasing the heat transfer coefficient in two-phase and single-phase currents and also mentioned the increase in pressure drop in this type of coils compared to flat coils. Use of Helical coils due to the higher effective level of these coils than direct coils One of their most important advantages. In this research, a experimental study of two-phase (boiling) flow of water fluid, The helical coil is discussed and the results will be presented below.