Research On The Heat Transfer Characteristics And Structural Optimization Of Plate Heat Exchanger

Heat exchanger, which is one of the basic heat transfer equipments, has been widely applying in the daily life and the field of production. Spiral plate heat exchanger is paid attention due to the advantages, such as the high efficient heat transfer, the compact structure, the self flushing, the low cost, and the small heat loss. With the continuous improvement of living standards and industrial technology, the use and the consumption of conventional energy have been growing rapidly, in view of which, it is of significance to improve the performance of the heat exchanger in order to reduce the energy consumption.Based on the theory of heat transfer enhancement, and by establishing the reasonable mathematical and physical model, the flow channel of the spiral plate heat exchanger, in which some cylindrical, spiral and pyramid-like spoilers were added, were simulated by using FLUENT software, and then the better heat transfer conditions were selected, simulated and optimized further. According to the numerical simulation results, combining with heat transfer enhancement theory, the results of every structure were comprehensively compared and analyzed to select the optimal structure.Studies show that the heat exchange effect of the fifth arrangement of cylindrical spoilers is the best one among its five arrangement manners. The heat exchange effect of arrangement 5 is optimal for two kinds of the constant curvature and variable curvature spiral spoilers. The position changes of pyramid spoiler have less effect on the parameters. After the various parameters are compared and analyzed, it can be found that the heat exchange effect of the constant curvature spiral spoiler is superior to the others among cylindrical, spiral and pyramid spoilers. After the structures of certain arrangement manner of cylindrical and spiral spoilers were optimized and analyzed further, it is found that the heat exchange effect is not improved as the height of spoiler varies in the same diameter, and when the spoiler height unchanged, the heat transfer effect has not been improved with the reduction of the diameter, but the effect is improved as the diameter increases, and hence, the diameter of the spoiler plays a very important role to enhance the heat transfer in the spiral plate heat exchanger.