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昆明冶金高等专科学校学报 ›› 2024, Vol. 40 ›› Issue (6): 1-.DOI: doi:10.3969/j.issn.1009-0479.2024.06.001|

• 冶金技术与材料 •    

低浓度纳米制冷剂导热系数实验与机理模型研究


  

  1. (1云南中宣液态金属科技有限公司云南省液态金属制备与应用工程研究中心,云南宣威655400;
    2昆明冶金高等专科学校a云南省数字孪生绿色新能源储能材料产业链国际联合研发中心;
    b冶金与矿业学院,云南昆明650033)
  • 出版日期:2024-07-04 发布日期:2025-07-04
  • 作者简介:朱家军(1985-),男,云南宣威人,工程师,工学学士,主要从事液态金属前沿新材料应用开发与研究。
  • 基金资助:
    云南省“兴滇英才支持计划”青年人才专项项目“电池热管理相变材料及强化传热关键技术应用研究”。

ExperimentalandModellingStudiesofThermalConductivityof#br# NanorefrigerantswithLowVolumeConcentration#br#

  1. (1EngineeringResearchCenterofLiquidMetalPreparationandApplicationofYunnanProvince,YunnanZhongxuanLiquid
    MetalTechnologyCo.,Ltd.,Xuanwei655400,Yunnan,China;2aYunnanInternationalJointResearchandDevelopment
    CenterofGreenEnergyStorageMaterialIndustrialChainCoupledwithDigitalTwinTechnology;2bFacultyof
    MetallurgyandMining,KunmingMetallurgyCollege,Kunming650033,China)
  • Online:2024-07-04 Published:2025-07-04

摘要: 摘 要:低浓度纳米制冷剂(颗粒体积浓度<01%)以其高导热、低阻力和低成本的优点,在实际应用中有望
获得更佳的效果。实验制备了颗粒体积浓度为002%、004%、006%、008%和01%的Al2
O3R141b、TiO2
R141b和SiO2R141b纳米制冷剂,在温度278~298K下考察了颗粒体积浓度、温度、颗粒导热系数和颗粒团聚
直径对纳米制冷剂导热系数的影响,并基于实验数据提出了考虑吸附层、颗粒团聚和布朗运动效应的导热系数
机理模型。结果表明:纳米制冷剂导热系数比纯R141b分别最大提高了1336%、1478%和1687%;纳米制冷
剂的导热系数随颗粒体积浓度、温度和颗粒导热系数的增加而增大,随颗粒团聚直径的增大而减小;模型计算
值与实验值偏差<3%,对于低浓度纳米制冷剂,导热系数增强的主要机制为布朗运动。

关键词: 纳米制冷剂, 低浓度, 导热系数, 颗粒团聚直径, 导热机理

Abstract: Abstract:Duetotheadvantagesofhigherthermalconductivity,lowerresistance,andlowercost,
nanorefrigerantswithlowvolumeconcentration(particlevolumeconcentration<01%)areexpectedto
bringmorebenefitsinpracticalapplications.Inthiswork,R141bbasednanorefrigerantscontaining
Al2
O3,TiO2andSiO2nanoparticleswithvolumeconcentrationsof002%,004%,006%,008%
and01% werepreparedandcharacterized.Onthebasisofverifyingthestability,theeffectsofnanop
articleconcentration,temperature,thermalconductivityofnanoparticleandaggregatesize(hydraulic
size)onthethermalconductivityofnanorefrigerantswasinvestigated,withinthetemperaturerangeof
278~298K.Basedonexperimentaldata,asemimechanism modelforthethermalconductivityof
nanorefrigerantswasproposedbyconsideringthemechanismsofinterfaciallayer,aggregationandBrown
ianmotion.Theresultsshow thatthethermalconductivityofnanorefrigerantscanbeincreasedb
1336%,1478% and1687% atmost,byaddingAl2
O3,TiO2andSiO2nanoparticles,respective
ly.Thethermalconductivitiesofnanorefrigerantsincreasedwithincreasingtemperature,concentration,
andnanoparticlethermalconductive,whiledecreasedwithincreasingparticlesize.Meanwhile,thede
viationofthedataobtainedbythepresentmodelfromtheexperimentalvalueswasmostlylessthan3%.
Fornanorefrigerantswithlowconcentration,thecontributionofBrownianmotiontothermalconductivity
enhancementisdominant.

Key words: nanorefrigerants, lowvolumeconcentration, thermalconductivity, aggregatesize, heatcon
ductionmechanism

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