Research On Enhancement Of Heat Transfer In Shell Side Of Flower Baffle Heat Exchanger

The heat exchanger is the basic process equipment which has been widely used in a variety of industrial field including petrochemical engineering, energy and power, metallurgy, refrigeration and so on. With the consciousness of increasing the environment protecting and energy saving of human being, more and more importance has been attached on the heat exchanger used commonly in industry production. Therefore, the research on the heat exchanger has been further studied and various types of energy saving heat exchangers have been developed. Meanwhile the enhancement in shell side is always the intra-industry emphases. Considering of such situation, the flower baffle was developed as a new, efficient and energy-saving heat exchanger. Because of its unique support structure, the flower baffle can both enhance the efficiency of the heat transfer and reduce the pressure drop.Based on the works presented previously, the research of flower baffle has been carried out for 4 kinds of flower baffles which have the different number of the baffles. The achieved results are as follows:1. Expressions of heat transfer and flow resistance have been obtained based on the experiment data.2. When the flow rate of the tube side and the shell side in the 4 heat exchangers are equal, the over all heat transfer coefficient K of the flower baffle heat exchanger with 10 baffles is higher than that of other flower baffle heat exchangers with different baffles, and the shell side pressure dropΔp is about 96%~105% of that of the flower baffle heat exchangers with 8, 9 and 11 baffles, while the integrated performance K/Δp increases 2%~9% compared with that of other flower baffle heat exchangers.3. When the Re of shell side in the 4 heat exchangers are equal, the Nu of shell side of the flower baffle heat exchanger with 10 baffles is about 109% of that of the flower baffle heat exchanger with 11 baffles and 103% of that of the flower baffle heat exchanger with 9 baffles, and the shell side pressure dropΔp is about 89% of that of the flower baffle heat exchanger with 11 baffles and 102% of that of the flower baffle hear exchanger with 9 baffles, while the shell side integrated performance Nu/Δp increases about 1%~23% compared with that of other flower baffle heat exchangers.4. Because the enhancement of the efficiency of the heat exchanger is for the practical application of industry, this paper compared the heat transfer coefficient K when the consumption of energy of the flower baffle heat exchanger and the single segmental baffle heat exchanger is equal. According to the result achieved, proposals for choosing which kind of heat exchangers have been given.The summarization is made and some propositions about the further research are proposed at the end of this article.