HPMug2oMmNrOfxWQHLiEksa6s0hFu9Ox348d7QefarYlaFR5ArkhOwm3Da1pmxmxCtenj1+6luWD#r#n+EPn9L6Ce+9onqnMlT+i ›› 2024, Vol. 40 ›› Issue (6): 1-.DOI: 10.3969/j.issn.1009-0479.2024.06.001
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Abstract: Abstract:Duetotheadvantagesofhigherthermalconductivity,lowerresistance,andlowercost, nanorefrigerantswithlowvolumeconcentration(particlevolumeconcentration<01%)areexpectedto bringmorebenefitsinpracticalapplications.Inthiswork,R141bbasednanorefrigerantscontaining Al2 O3,TiO2andSiO2nanoparticleswithvolumeconcentrationsof002%,004%,006%,008% and01% werepreparedandcharacterized.Onthebasisofverifyingthestability,theeffectsofnanop articleconcentration,temperature,thermalconductivityofnanoparticleandaggregatesize(hydraulic size)onthethermalconductivityofnanorefrigerantswasinvestigated,withinthetemperaturerangeof 278~298K.Basedonexperimentaldata,asemimechanism modelforthethermalconductivityof nanorefrigerantswasproposedbyconsideringthemechanismsofinterfaciallayer,aggregationandBrown ianmotion.Theresultsshow thatthethermalconductivityofnanorefrigerantscanbeincreasedb 1336%,1478% and1687% atmost,byaddingAl2 O3,TiO2andSiO2nanoparticles,respective ly.Thethermalconductivitiesofnanorefrigerantsincreasedwithincreasingtemperature,concentration, andnanoparticlethermalconductive,whiledecreasedwithincreasingparticlesize.Meanwhile,thede viationofthedataobtainedbythepresentmodelfromtheexperimentalvalueswasmostlylessthan3%. Fornanorefrigerantswithlowconcentration,thecontributionofBrownianmotiontothermalconductivity enhancementisdominant.
Key words: nanorefrigerants, lowvolumeconcentration, thermalconductivity, aggregatesize, heatcon ductionmechanism
CLC Number:
TK124
ZHUJiajun1, LIYongjia2a, b, ZHANGSongyuan2a, b, YANGZhihong2a, b, CAIChuanxiong2a, b, LIYuexiwei2a, b. ExperimentalandModellingStudiesofThermalConductivityof#br# NanorefrigerantswithLowVolumeConcentration#br#[J]. HPMug2oMmNrOfxWQHLiEksa6s0hFu9Ox348d7QefarYlaFR5ArkhOwm3Da1pmxmxCtenj1+6luWD#r#n+EPn9L6Ce+9onqnMlT+i, 2024, 40(6): 1-.
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URL: http://kmyzxb.magtech.com.cn/EN/10.3969/j.issn.1009-0479.2024.06.001
http://kmyzxb.magtech.com.cn/EN/Y2024/V40/I6/1