Abstract
Shall-and-tube heat exchangers based on the bundles with in-line or staggered arrangements have been widely used in industry and power engineering. A large number of theoretical and experimental works are devoted to study of hydrodynamic and heat transfer processes in such bundles. In that, works the basic studies of heat and mass transfer for these bundles are found. However, heat exchangers of this type can have big dimensions and mass. One of the ways to improve the weight and dimensions of the shell-and-tube heat exchangers is to use compact arrangement of tube bundles. A new design of heat exchanger is proposed, in which there are no gaps between adjacent tubes that touch each other. Different geometry of these tube bundles with displacement of adjacent tubes in the direction of transverse to the flow is considered. Numerical modelling and experimental investigations of hydrodynamic, heat and mass transfer processes in such tube bundles has been carried out. The distribution of velocities, temperatures, and pressure in inter-tube channels have been obtained.
Highlights
One of the most common equipments that are used in all types of power plants and engines are heat exchangers
It is known that for shell-and-tube heat-exchangers maximal heat transfer in tube bundles is observed in the case of a cross current of heat carriers, i.e. in the case of the transverse flow around such bundles
2.2 Numerical computer modelling For the co-generation plant on the base of combustion engine with new design waste heat utilizer of exhaust gases the computer modelling of hydrodynamics and heat transfer processes, which occur in channels of investigated tube bundles is conducted
Summary
One of the most common equipments that are used in all types of power plants and engines are heat exchangers. The number of papers devoted to investigations of the processes of hydrodynamics and heat, mass transfer in compact smooth-tube bundles, with minimum intertube intervals, is very insignificantly. Extensive studies of convective heat transfer of various transversely streamlined bundles of smooth cylindrical tubes with their inline arrangement were carried out by Zhukauskas et al In that studies, the main laws of the change in heat transfer and hydrodynamics are studied. Transversely streamlined bundles of smooth tubes with the inline arrangement were carried out by Aiba [6, 7]. The investigation of the processes occurring in heat exchangers is aimed at increasing the efficiency of the compressed smooth-tube bundles with inline configuration and inline shifted configuration with a minimum longitudinal relative step equal to unity. Experimental research, numerical computer modelling and thermohydraulic calculations of processes of heat transfer and hydrodynamics, which occur in channels of compact bundles, are carried out
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