Numerical Simulation Of Shell-and-tube Heat Exchanger And Research On Sideling-flow Heat Exchanger

The research and development of energy saving process equipments is an important method to save energy nowadays. The heat exchange is a kind of universal technologic equipment, which is widely used in many industries, such as chemical industry, oil refining, power generation, food industry, light industry, atomic energy installation, medicine manufacturing industry, aerospace industry and so on. Shell-and-tube heat exchanger has many advantages such as reliable structure, mature technique and wide applicability, so it is the mostly used structure in the internal and overseas applications of heat exchangers. The shell-and-tube heat exchanger gets continuous improvement and development with the great progress of the heat transfer enhancement technique and modern design and research method.The method which integrates theoretical analysis, numerical simulation and experiment is adopted to research the heat transfer enhancement technique for the shell-side of the shell-and-tube heat exchanger in the paper. The following main achievements and innovations are obtained.1. Heat transfer enhancement performances of rod baffles with abnormal profiles such as triangular one, rhombic one, are investigated. And influence laws of the profile shapes of rod baffles on fluid flow and heat transfer performance are discovered, which provides more optional structures for improving the rod baffle heat exchanger.2. Based on the deep research of structure characteristics of the shell-side of the shell-and-tube heat exchanger and laws of fluid flow and heat transfer, the concept of "sideling flow" in the shell-side is presented for the first time, which is relative to the flow states of the cross-flow, the longitudinal-flow and the helical-flow. The effect of this flow states is that it can disperse the cross-flow in the main flow region of the cross-flow heat exchanger into the sideling-flow compelled, and so that dead spaces of the flow and heat transfer are dispersed and partly eliminated by the special support structure for tube bundles. The great change of velocity and the kinetic energy loss of the fluid caused by the transverse obstruct is avoided, besides, the heat transfer enhancement caused by the much more strong scour effect of the cross-flow on tubes is utilized effectively. Because of the overall...