Research On Fluid Flow And Heat Transfer Characteristics In Channel Of Honeycombed Plate Heat Exchanger

As the essential equipment in heat exchanging, heat exchanger plays a veryimportant role in industrial processes. Augmentation of heat transfer efficiency of theheat exchanger has a vital significance for improving energy utilization rate.Honeycombed plate heat exchanger has been widely applied in many fields in overseacountries, which gather most advantages of shell tube exchanger and plate heatexchanger. But in our country, there is very less research about the honeycomb plate. Inthe thesis, the flow and heat transfer characteristics is studied with numerical simulationto provide a theoretical basis for the optimization design of the honeycomb plate heatexchanger.In generally there are two types of structure of the of the honeycomb plate heatexchanger, i.e. single-sided honeycomb panel and double-sided honeycomb panel. Inthis thesis, the three dimensional physical model and mathematical model of turbulentflow and heat transfer in the channel of honeycombed plate heat exchanger wereestablished, and the corresponding flow field and temperature field was numericallysimulated. The heat transfer and pressure drop characteristics of the channel wereinvestigated under different Reynolds number, and the effects of spot diameter,cellular size, plate spacing spot spacing on the flow and heat transfer performance areanalyzed too. Finally, flow and heat transfer efficiency between single side bubblingand double side bubbling honeycomb plate is compared, the following are the mainconclusions:1. The computed results showed that the disturbance of fluid is enhanced in theflow channel of honeycomb plate. Both of the heat transfer coefficient and pressuredrop of the channel are obviously increased along with Reynolds number and thecomprehensive heat transfer factor is decreased along with Reynolds number. The studyalso found that flow and heat transfer characteristics of two types honeycomb panel isbasically the same change trends with Reynolds number.2. Around the solder joint, the heat transfer coefficient is higher than other zones.And the heat transfer coefficient before the solder joint is higher than that behind thesolder joint. When the solder joint diameter is increased, the heat transfer coefficient isincreased too，but the drag coefficient is decreased.3. The heat transfer area and Nusselt numble is increased along with cellular size, but drag coefficient f is decreased along with cellular size.4. When Reynolds number is within lower range, the comprehensive heat transferperformance is increased with the increase of the space between plates. In contrast,when Re is within higher range, the comprehensive heat transfer performance isincreased with the decrease of the space between plates..5. When the space between the solid joint is increased, both of the heat transfer andpressure drop are decreased. But comprehensive heat transfer performance is increased.6. Under the same geometry size, Re＞3800，the comprehensive heat transferperformance of double side bubbling honeycomb plate is superior to single sidebubbling honeycomb plate. In contrast, Re＜3800, the comprehensive heat transferperformance of single side bubbling honeycomb plate is superior to double sidebubbling honeycomb plate.