摘要
提出一种新型折流板——曲面弓形折流板,并构造曲面弓形折流板换热器,采用数值模拟和实验相结合的方法研究其壳程传热和流动阻力性能。在实验方面,设计了实验用曲面弓形折流板和普通弓形折流板换热器试样,其中换热器管束采用可拆连接形式,以考察不同折流板结构和板间距的影响。通过改变管程及壳程流量和管程流体进口温度,获得了大量对应于不同折流板结构的壳程压力降和传热系数实验数据。在模拟方面,利用Fluent软件建立了曲面弓形折流板换热器和普通弓形折流板换热器流体数值分析模型,得到了壳程流体流场分布及壳程压力降和传热系数。结果发现,在相同结构参数和流动条件下,曲面弓形折流板换热器壳程压力降比普通弓形折流板换热器降低9%~24%,而壳程传热系数比普通弓形折流板换热器提高3%~11%。
With reliable structure,mature design methodology and wide applications,shell-and-tube heat exchanger is the major form of heat exchange equipment and widely used in chemical,oil refining,power,food,medicine,aerospace and many other industries.In this study,a new type of baffle,namely curved baffle,is proposed and used to construct a shell-and-tube heat exchanger.Heat transfer and flow resistance of fluid in the shell side were studied numerically and experimentally.For the experiments,heat exchangers with curved baffles were designed and constructed,and the traditional heat exchanger with plane baffles was also made for comparison.Tube bundles in these heat exchangers are detachable for investigation of the effects of baffle structure and distance between them.By changing volumetric flow in the tube or shell-side and the inlet temperature of tube-side fluid,a large amount of experimental data about the pressure drop and heat transfer coefficient in the shell side were obtained for different baffle structures.For the simulation,numerical analysis models for the curved baffle heat exchanger and plane baffle heat exchanger were established using the software Fluent.Results indicate that for the same structural parameters and flow conditions,shell-side pressure drops caused by baffles with the curved baffle heat exchanger are 9%—24% lower than those with the conventional segmental baffle,while the shell-side heat transfer coefficient is increased by 3%—11% with the curved baffles.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第5期1233-1238,共6页
CIESC Journal
基金
中国石油化工股份有限公司资助(308036)
关键词
曲面弓形折流板
数值模拟
压力降
传热
curved baffle
numerical simulation
pressure drop
heat transfer
