The article is devoted to determining the heat transfer coefficient during convective heat transfer. Convective heat transfer or heat transfer is the process of heat transfer between the surface of a solid and the surrounding medium (gas or liquid). In this case, heat transfer occurs due to the combined action of thermal conductivity and convection. The process of heat transfer in liquids and gases is determined by the heat transfer coefficient and temperature gradient, as in solids. The process of heat transfer during convective heat exchange is closely related to the transfer of the medium itself. Therefore, the convection process occurs only in liquids and gases, the particles of which move easily.