采用烧结Ni微纤多孔结构材料的微型换热器及其性能_李剑锋

2007年第36卷第12期石油化工PETROCHEMICALTECHNOLOGY[收稿日期]2006-06-26;[修改稿日期]2007-08-29。[作者简介]李剑锋(1978—),男,河南省伊川县人,博士生,电话021-62233882,电邮52050606015@student.ecnu.edu.cn。联系人:路勇,电话021-62233424,电邮ylu@chem.ecnu.edu.cn。[基金项目]国家自然科学基金项目(20573036,20590366);教育部“新世纪优秀人才计划”(NCET-06-0423)资助项目;上海市“曙光计划”(06SG028)资助项目;华东师范大学2007年优秀博士研究生培养基金资助项目。采用烧结Ni微纤多孔结构材料的微型换热器及其性能李剑锋,路勇,何鸣元(华东师范大学化学系上海市绿色化学与化工过程绿色化重点实验室,上海200062)[摘要]采用烧结Ni微纤多孔结构材料(简称Ni微纤)制备了微型换热器,对其传热和流动性能进行了研究,考察了微型换热器结构对传热系数及流动阻力的影响。实验结果表明,填充Ni微纤能显著强化微型换热器的传热性能,比相同条件下空流道微型换热器的体积传热系数提高了2倍多;降低Ni微纤的孔隙率和减小流道深度可显著提高微型换热器的传热性能,但导致换热器的压降增加;采用导热系数高和厚度小的紫铜换热片有利于提高微型换热器的传热性能。Ni微纤孔隙率为95.1%、流道深度为0.3mm、换热紫铜片厚度为0.1mm、水的体积流量为14.6L/h时,微型换热器的体积传热系数高达40.0MW/(m3·K),面积传热系数可达20kW/(m2·K),压降约为0.2MPa。[关键词]烧结镍微纤;多孔材料;镍纤维;微型换热器;传热性能[文章编号]1000-8144(2007)12-1239-05[中图分类号]TQ051.5[文献标识码]AMicroHeatExchangerwithaNovelSinteredNiMicrofibrousStructuredWickandItsPerformanceLiJianfeng,LuYong,HeMingyuan(ShanghaiKeyLaboratoryofGreenChemistryandChemicalProcesses,DepartmentofChemistry,EastChinaNormalUniversity,Shanghai200062,China)[Abstract]Ahigh-performancemicroheatexchangerhasbeenconstructedbyusinganovelmicrofibrousstructuredwick.Influenceofmicroheatexchangerstructureparametersonheattransfercoefficientandpressuredropwaspresented.Heattransferperformanceofmicroheatexchangercouldbeenhanceddramaticallybyusingamonolithicmicrofibrousstructureconsistingofnickelfiber8μmindiameter.Theuseofthisapproachprovided2-foldormoreincreaseinvolumetricheattransfercoefficientundersameoperationalconditions.Reductionofmicrofibrousstructureporosityandflowchanneldepthpromotedheattransferperformancebutcausedlargepressuredrop.Moreover,useofthinnerheattransferplatemadeofcopperwithhigherthermalconductivitycoefficientalsoprovidedsignificantpromotionofheattransferperformanceathighflowrate.Underoptimalstructureofmicroheatexchangerasmicrofibrousporosity95.1%,flowchanneldepthof0.3mm,copperheatexchangeplatethicknessof0.1mmandwatervolumeflowrateof14.6L/h,volumetricheattransfercoefficient,overallheattransfercoef