不同邊界條件下園管對(duì)流換熱系數(shù)的研究

1、重慶大學(xué)碩士學(xué)位論文不同邊界條件下園管對(duì)流換熱系數(shù)的研究姓名：楊春申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：熱能工程指導(dǎo)教師：何川20060501重慶大學(xué)碩士學(xué)位論文英文摘要IIABSTRACTThecoefficientofconvectiveheattransferisimptanttodesignaheatexchanger.Nmallycoefficientofconvectiveheattransferisgottenthroughexperi

2、mentswhichisheatingtestingtubebyelectricitycomputedthroughNewtoncoolinglaw.Thewallofthistestingtubeisindefiniteheatflux(e.g.thesecondboundarycondition).Butactuallymuchofconditionoftubewallisinthermalboundarycondition（e.g

3、.thethirdboundarycondition）.SoifthereisanydifferenceofcoefficientofconvectiveheattransferbetweenthistwoboundaryconditionBothnumericalsimulationexperimentwereadoptedtoresearchductedheatconvection.Fthermalboundarycondition

4、thegaswashacrossatubethewaterflowinthetubeatthesametime.Inthisconditionheatconvectioninsideoutsideoftubearecoupled.Coefficientofconvectiveheattransferinsideoutsideoftubegottenthroughsuchwaycomparewithcoefficientofconvect

5、iveheattransferinsideoutsideoftubegottenthroughbyelectricity.Fcomparabilitybetweenthistwoconditiontheaverageheatfluxonthetubemustbeequalfthistwocondition.Fistweresarchlocalwalltemperatureousideinsideoftubelocalfluidtempe

6、ratureinsideoutsideoftubelocalheatfluxinsideoutsideoftubelocalcoefficientofconvectiveheattransferinsideousideoftubealongthetubeaxialdirection.Atthesametimewesuggestacrectionfacttothebefecoefficientofconvectiveheattransfe

7、rfmulaatthesecondboundarycondition.Theendshowthatcoefficientofconvectiveheattransferatthermalboundaryconditionishigherthanthatatdefiniteheatfluxboundarycondition.IfaccdingtodimensionlessequationofheatconvectionNunumberof