插入物对新型换热器传热性能的影响.pdf

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1、石油学报(石油加工)2015年6月ACTAPETROLEISINICA(PETROLEUMPROCESSINGSECTION)第31卷第3期文章编号：1001—8719(2015)03—0796—07插入物对新型换热器传热性能的影响焦凤，邓先和，宋鹏云(1．昆明理工大学化学工程学院，云南昆明650500；2．华南理工大学化学与化工学院，广东广州510640)摘要：在新型换热器——自支撑矩形缩放管换热器的基础上，利用Fluent数值模拟方法，研究了在其壳程内分别插人传统插入物(旋流片)和新型插入物(折板)后传热性能与流动特性的变化，研究的雷诺数(R)变化范围为

2、27900~41900。结果表明，与空管缩放管换热器相比，插入旋流片和折板的换热器壳程的传热系数随Re的增大分别增加了31．O7％～33．O8和38．O1～46．74；插入物在提高传热系数的同时也引起了通道内压降的增大，插入旋流片和折板时通道内压降分别增加了69．32～77．42％和68．49～87．16％；插入折板后壳程通道内的综合传热性能最好，其次是插入旋流片的，无插入物时则最差。提高换热器传热性能的关键是要改善通道两侧缩放管处的传热性能，减小速度场与温度场间的协同角是增强换热器传热性能的～项重要措施。关键词：自支撑；缩放管；强化传热；插入物中图分类号：

3、TK124文献标识码：Adoi：10．3969／j．issn．1。01—8719．2015．03．027EffectofInsertsonHeatTransferPerformanceofNewHeatExchangerJIAOFeng，DENGXianhe，SONGPengyun(1．FacultyofChemicalEngineering，KunmingUniversityofScienceandTechnology，Kunming650500，China；2．SchoolofChemistryandChemicalEngineering，SouthCh

4、inaUniversityandTechnology，Guangzhou510640，China)Abstract：Basedonthenewheatexchanger，self-supportrectangleconverging—divergingtubebundleheatexchanger，theturbulentheattransferandfluidflowcharacteristicsoftheheatexchangerwithdifferentinsertswerestudiedintheReynoldsnumberrangeof27900t

5、o41900by3-DnumericalsimulationswithFluentsoftware，andcomparedtothatofthebaselineconfiguration(withoutinsert)．Theusedinsertsincludedregularlyspacedtwisted—tape(RSTT)andbaffleplate(BP)．Theresultsshowedthatcomparedwiththebaselinecase，theair—sideheattransfercoefficientsofthetwoenhanced

6、caseswereimprovedby31．07一33．O8％and38．01一46．74％，withanassociatedpressuredroppenaltyincreaseof69．32～77．42and68．49一87．16，respectively．TheBPcaseobtainedthebestoverallperformance，followedbytheRSTTcase，andthebaselinecasewastheworst．Thekeypointofenhancingheattransferofshellsidewastoimprov

7、etheheattransferperformanceonconverging—divergingtube．Thereductionintheaverageintersectionanglebetweenthevelocityvectorandthetemperaturegradientwasoneoftheessentialmeasurestoenhanceheattransferperformanceofheatexchanger．Keywords：self—support；converging—divergingtubebundle；heattrans

8、ferenhancement；insert换热器在石