The effects of temperature and volume fraction on the thermal conductivity of functionalized DWCNTs/ethylene glycol nanofluid

Shamaeil, Meisam; Firouzi, Masoumeh; Fakhar, Ahmad

doi:10.1007/s10973-016-5548-x

Cited by 63 publications

(12 citation statements)

References 35 publications

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“…Both figures show that there is a parallel tendency for concentrations and temperature. Additionally, the tendency of both graphs is almost similar to that in previous studies on the thermal conductivity of nanofluid [37][38][39][40][41][42][43][44]. The temperature effect on the improvement of thermal conductivity in nanofluid is mainly caused by the increase in the intensity of Brownian motion that is the result of augmentation of interactions and movement between nanoparticles.…”

Section: Thermal Conductivity Characteristics Of Mwcnt Nanofluidsupporting

confidence: 83%

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

2019

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Multiwalled carbon nanotubes (MWCNTs) have attracted attention from researchers because of their superior thermal properties and high optical absorption. In this investigation, the thermal and optical properties of functionalized and nonfunctionalized MWCNT nanofluid based on ethylene glycol/water were experimentally studied and compared. The results indicated that the use of the functionalized MWCNT nanofluid improved the thermal properties and optical absorption performance compared with the nonfunctionalized MWCNT nanofluid. The thermal conductivity enhancement of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized MWCNT nanofluid. The maximum thermal conductivity enhancement (10.15%) was observed in a functionalized MWCNT concentration of 0.01 wt% at 50 °C compared with the base fluid. In addition, the photo-thermal energy conversion efficiency of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized one owing to its higher light absorption and thermal conductivity.

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Section: Thermal Conductivity Characteristics Of Mwcnt Nanofluidsupporting

confidence: 83%

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

2019

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“…Next, the effects of various parameters such as temperature and concentration are investigated on the magnitude of Nusselt number of nanofluids. Table 1) while, inversely, thermal conductivity decreases [9,10].…”

Section: Resultsmentioning

confidence: 95%

“…Many works have been performed to evaluate the thermal conductivity of CNT nanofluids, as nicely reviewed in [8]. This is also shown in recent works [9,10]. However, there is still no reliable and universal model for thermal conductivity enhancement of CNT nanofluids, as shown in recent work [11].…”

Section: Introductionmentioning

confidence: 91%

“…This equation appears as an improvement of the Berkovskie-Polevikov equation[22] in particular for high Prandtl numbers. of non-Newtonian fluids, the average Nusselt number can be expressed in terms of algebraic function of Ra, Pr, and flow index behavior "n"[21] as , c1, c2 and c3 are given by the following relationships for n ≤ 1 c1 = 1.343; c2 = 0.065; c3 = 0.036(10) also, in this case Ra and Pr numbers are respectively expressed as…”

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confidence: 99%

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Natural convection of CNT water-based nanofluids in a differentially heated square cavity

Estellé

Mahian

Maré

et al. 2017

J Therm Anal Calorim

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International audienceThe present paper deals with the prediction of average Nusselt number in a differentially heated square cavity filled with Newtonian and non-Newtonian CNT nanofluids. Based on thermophysical properties which were experimentally evaluated, available correlations are used for estimating the Nusselt number and heat transfer coefficient of natural convection of CNT nanofluids with volume fractions in a range of 0.0055 to 0.418 %. The effects of surfactant, average temperature of nanofluids within the cavity, driving temperature of cavity walls on Nusselt number are investigated and discussed. A peculiar attention is devoted to the non-Newtonian nature of CNT nanofluids in the analysis. It is found in particular that Nusselt number of nanofluids is lowered by nanoparticle content increase related to Non-Newtonian behaviour of nanofluids and temperature increase

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“…The increase in thermal conductivity of nanofluids containing various types of nanoparticles was intensively studied [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, when planning the practical use of nanofluids, it should be taken into account that with increasing concentration of the nanoparticles in a liquid its viscosity increases [19,20,26].…”

Section: Introductionmentioning

confidence: 99%

Viscosity and thermal conductivity of MgO–EG nanofluids

Żyła

2017

J Therm Anal Calorim

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Nanofluids are a group of novel engineering materials that are increasingly being used, particularly in the processes of heat exchange. One of the most promising materials in this group is magnesium oxide-ethylene glycol (MgO-EG) nanofluid. The literature informs that this material is characterized by an significant increase in thermal conductivity with low dynamic viscosity increase. The aim of this paper is to provide experimental data on the dynamic viscosity and thermal conductivity of nanofluids containing MgO nanoparticles with 20 nm average size and ethylene glycol as base fluid. To determine dynamic viscosity and thermal conductivity of samples, a HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany) and KD2 Pro Thermal Properties Analyzer (Decagon Devices Inc., Pullman, Washington, USA) were used. Additionally, a comparison of the experimental results and the predictions of theoretical models was presented. It was presented that the vast majority of theoretical models does not describe in a correct way both viscosity and thermal conductivity. It was also shown that the enhancement of this basic physical properties might be described with good result with second degree polynomials. Finally, evaluation of the heat transfer performance was presented.

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The effects of temperature and volume fraction on the thermal conductivity of functionalized DWCNTs/ethylene glycol nanofluid

Cited by 63 publications

References 35 publications

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

Natural convection of CNT water-based nanofluids in a differentially heated square cavity

Viscosity and thermal conductivity of MgO–EG nanofluids

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