IJE TRANSACTIONS B: Applications Vol. 30, No. 8 (August 2017) 1223-1230   

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M. Thakur, D. Gangacharyulu and G. Singh
( Received: March 29, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    Nanofluids are the heat transfer fluids having remarkable thermal properties. The paper presents the experimental analysis of thermal conductivity, density, specific heat and viscosity of multiwalled carbon nanoparticles dispersed in water at various temperatures and particle concentrations. To examine the forced convection heat transfer of Multiwalled Carbon Nanotubes (MWCNT)-water nanofluid, the assessment of thermophysical properties are necessary. The two-step method was used to prepare the nanofluids with gum arabic surfactant. The thermophysical properties were measured using different volume concentrations (i.e. 0 0.9 vol.%) of nanoparticles and various temperatures (i.e. 30C to 70C). The thermal conductivity, specific heat, density and viscosity were measured with the help of KD2 Pro Thermal Property Analyser, Differential Scanning Calorimeter, KEM-DA 130N - Portable density meter, Brookfield LVDV-III ultra-programmable viscometer. The experiment found an enhancement in thermal conductivity and specific heat with rise in temperature whereas viscosity and density decreases with increase in temperature. On the other hand the thermal conductivity, viscosity and density increases with increase in MWCNTs concentration but the specific heat was found to diminish with a rise in particle concentration.


Keywords    MWCNT, thermophysical properties, nanofluids


چکیده    نانوسیالات، مایعات انتقال گرما با خواص حرارتی قابل توجهی هستند. مقاله تحلیلی آزمایشی هدایت حرارتی، تراکم، گرمای ویژه و گرانروی نانوذرات کربنی چند دیواره در آب را در غلظت ذرات و دماهای مختلف ارائه میدهد. برای بررسی انتقال حرارت اجباری از نانولولههای کربنی پراکنده در آب ارزیابی خواص ترموفیزیکی ضروری است. روش دو مرحلهای برای تهیه نانوسیمهای با سورفکتانت صمغ عربی استفاده شد. خواص ترموفیزیکی با استفاده از غلظتهای مختلف (به عنوان مثال 0-0.9٪ حجمی) نانوذرات و دماهای مختلف (از جمله 30 تا 70 درجهی سانتیگراد) اندازه گیری شد. هدایت حرارتی، گرمای ویژه، تراکم و گرانروی با کمک تحلیلگر گرمایی KD2 ، Calorimeter Scanningو کالریمتر تفاضلی ، چگالیسنج قابل حملKEM-DA 130N ، ویسکومتر Ultra-programmable LVDV-III Brookfield اندازه گیری شدند. این آزمایشها افزایش هدایت حرارتی و گرمای ویژه با افزایش درجه حرارت ر ا نشان دادند، در حالی که گرانروی و چگالی با افزایش دما کاهش میبابد. از سوی دیگر هدایت حرارتی، گرانروی و چگالی با افزایش غلظت MWCNT افزایش مییابد، اما با توجه به افزایش غلظت ذرات، گرمای ویژه کاهش مییابد.


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