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Journal of Kunming Metallurgy College ›› 2024, Vol. 40 ›› Issue (6): 1-.DOI: doi:10.3969/j.issn.1009-0479.2024.06.001|

   

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

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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