Indexed by:期刊论文
Date of Publication:2022-06-30
Journal:Huagong Xuebao/CIESC Journal
Volume:72
Issue:9
Page Number:4511-4522
ISSN No.:0438-1157
Abstract:Developing a high efficiency and low resistance performance heat exchanger is an important way to improve the energy conversion efficiency of the power system, which is of great significance for marine engineering such as shipping industry and offshore oil platform, as well as oil drilling platform and other fields. Inspired by shark gill slit structure, a special-shaped heat exchanger with bionic structures (SSBHX) is designed in this work to greatly release the space and improve the integration of the heat exchanger. By adding four different types of baffles on the shell side of the heat exchanger and introducing "clearance flow" at the inlet, the distribution of flow field, pressure field and temperature field on the shell side of the heat exchanger and the performance difference of the heat exchanger are investigated under various Reynolds numbers between 10000 to 50000 by numerical simulation. The results show that the shell side pressure drop of ladder baffle special-shaped heat exchanger with bionic structures (SSBHX-LA) is about 82% and 65% lower than that of segmental baffle special-shaped heat exchanger with bionic structures (SSBHX-SG), staggered baffle and inlet clearance staggered baffle special-shaped heat exchanger with bionic structures (SSBHX-ST and SSBHX-CST) when the velocity is 0.5 m/s. As the Reynolds number between 15000 and 35000 (0.63—1.46 m/s), the high efficiency and low resistance performance of SSBHX-CST has obvious advantages, which is about 12% higher than that of SSBHX-SG; when the Reynolds number is more than 35000 (v>1.46 m/s), the overall performance of SSBHX-LA is about 5% higher than that of SSBHX-SG, which can be applied to the application environment with higher pressure drop requirements on the shell side. The comprehensive performance evaluation diagrams of heat exchangers under different working conditions are given to provide guidance for practical application and design analysis. © 2021, Editorial Board of CIESC Journal. All right reserved.
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