HYDRODYNAMIC MEANS OF HEAT EXCHANGE INTENSIFICATION IN CONSTANT CROSS-SECTION ROUND CHANNELS

Abstract

The purpose of research is the analysis of innovative designs of hydrodynamic means of intensification of heat exchange in channels of constant cross-section of technological equipment and pipelines, intended for use in the thermal power, chemical, food and related industries. The study of the state of the issue and trends in the development of structural and technological design of hydrodynamic elements of pipes and tubular elements for the intensification of heat exchange are based on a critical analysis of scientific and technical sources of information and, first of all, patent information of the leading countries of the world. The classification of these means for intensification of heat exchange in equipment and pipelines of thermal energy, chemical, food and related industries is proposed. The most interesting designs of these elements proposed by scientists, designers and inventors of the leading countries of the world are considered. A critical assessment of most of the above constructions is provided, their advantages and disadvantages are discussed. Designs of means of intensification of heat exchange in channels are analyzed depending on the change in flow continuity, the degree of mobility of the working element, the nature of the effect on the flow over time, relative length, assembly/disassembly possibilities, the degree of curvature of the channel, material, level of assembly, the degree of rigidity, the degree of mobility of the working element, the possibility of changing the geometry of the working channel , the possibility of temperature regulation, as well as the degree of uniformity of the heat flow in the circular direction of the channel. Means according to the change of flow continuity, namely turbulizers and cavitators, were analyzed in more detail. It is shown that, despite the significant variety of structural and technological design of hydrodynamic means of heat exchange intensification in round channels of constant cross-section, the most demanded by the industry are technologically diverse removable turbulizers that can be replaced or completely removed from the channel if necessary. Less common are cavitators, because they are usually characterized by less versatility and manufacturability, as well as greater sensitivity to the flow rate of the transported flow and its physical properties. Bibl. 44, Fig. 19.