低雷諾數(shù)下新型強(qiáng)化傳熱管的研究與開發(fā).pdf

1、鄭州大學(xué)碩士學(xué)位論文低雷諾數(shù)下新型強(qiáng)化傳熱管的研究與開發(fā)姓名：朱青申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化工過程機(jī)械指導(dǎo)教師：董其伍20070425AbstractHeatexchangersareuniversalequipmentsusedinmanyindustrialfieldssuchaschemicalindustrypetroleumrefiningindustrypowerindustryfoodindustrylightindust

2、ryatomicenergyinstallation，medicinemanufacturingindustryaerospaceindustryandsoOilInthethermodynamicsystemtheinvestmentofheatexchangersisinhiigherproportioninthegrossinvestmentofanenterpriseandtheperformanceofheatexchange

3、rsdirectlyinfluencesthethermalcostInrecentyears，becauseofmanyfactorssuch髂processrequirements，energycrisisete，theresearchonheattransferenhancementtechniqueshaSbeenanimportantwaytosaveenergynowadaysTheshell—and—tubeheatexc

4、hangerhasmanyadvantagessuch嬲reliablestructurematuretechniques，wideapplicationandSOon，soitisthemostfrequentlyusedstructureinthethermodynamicsystempresentlyItgetsimprovedanddevelopedcontinuouslywiththegreatprogressoftheres

5、earchmethodonheattransferenhancementtechniquesandmodemdesignTheresearchonheattransferenhancementforthetube—sideoftheshellandtubeheatexchangeriscarriedoutbytheoreticalanalysis，numericalsimulationandexperimentsinthisdisser

6、tationConcretelytheissueofheattransferaugmentationisresearchedinallusiontothewidelyexistedproblemofthelowheattransfercoefficientoflaminarconvectiveheattransferintubesAnewtypeoftubeisfirstlyintroducedunderthedirectionofth

7、eFieldSynergyPrinciple，whichcanbemanufactureddirectlybyrollingthetraditionalsmoothpipeThemanufacturingprocedureisSOsimplethatitcostslowThenewstructurecarlmarkedlyenhancethelaminarconvectiveheattransferofthetubesideWithle

8、ssadditionalincreaseofnoWresistanceandthushasanexcellentintegratedperformanceofheattransferenhancementThemulti—longitudinalvortexflowinthenewtubeisinducedbyalternatingchangeofitscrosssection，whichistheoptimalvelocityfiel

9、dforlaminarconvectiveheattransferintubesanddoesn’teasilyattenuatealongaxialdirectionThat’SwhythenewtubecallremarkablyenhanceheattransferMeanwhile，theflowresistanceisrelativelylowSothenewstructureisasensationalkindofheatt