### Abstract

Original language | English |
---|---|

Pages (from-to) | 1009-1019 |

Number of pages | 11 |

Journal | International Journal of Heat and Mass Transfer |

Volume | 120 |

DOIs | |

Publication status | Published - 2018 |

### Fingerprint

### Keywords

- Copper oxide
- Nano-PCM
- non-Newtonian fluid
- Octadecane
- Thermal conductivity
- Viscosity
- Copper compounds
- Copper oxides
- Heat storage
- Lubrication
- Magnetic storage
- Nanofluidics
- Nanoparticles
- Non Newtonian flow
- Non Newtonian liquids
- Phase change materials
- Rheology
- Shear thinning
- Temperature
- Thermal conductivity of liquids
- Viscosity measurement
- Chemical formulae
- Effect of temperature
- Nanoparticle concentrations
- Non-Newtonian behaviors
- Non-Newtonian fluids
- Rheological behaviors
- Spherical nanoparticles

### Cite this

*International Journal of Heat and Mass Transfer*,

*120*, 1009-1019. https://doi.org/10.1016/j.ijheatmasstransfer.2017.12.106

**Effect of temperature and CuO-nanoparticle concentration on the thermal conductivity and viscosity of an organic phase-change material.** / Águila V, B.; Vasco, D.A.; Galvez P, P.; Zapata, P.A.

Research output: Contribution to journal › Article

*International Journal of Heat and Mass Transfer*, vol. 120, pp. 1009-1019. https://doi.org/10.1016/j.ijheatmasstransfer.2017.12.106

}

TY - JOUR

T1 - Effect of temperature and CuO-nanoparticle concentration on the thermal conductivity and viscosity of an organic phase-change material

AU - Águila V, B.

AU - Vasco, D.A.

AU - Galvez P, P.

AU - Zapata, P.A.

N1 - Export Date: 12 April 2018 CODEN: IJHMA Correspondence Address: Vasco, D.A.; Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, Av. Lib. Bdo. O'Higgins, Chile; email: diego.vascoc@usach.cl References: Sharma, A., Tyagi, V.V., Chen, C.R., Buddhi, D., Review on thermal energy storage with phase change materials and applications (2009) Renew. Sustain. Energy Rev., 13 (2), pp. 318-345; Bahraseman, H.G., Languri, E.M., East, J., Fast charging of thermal energy storage systems enabled by phase change materials mixed with expanded graphite (2017) Int. J. Heat Mass Transf., 109, pp. 1052-1058; Al-Aifan, B., Parameshwaran, R., Mehta, K., Karunakaran, R., Performance evaluation of a combined variable refrigerant volume and cool thermal energy storage system for air conditioning applications (2017) Int. J. 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PY - 2018

Y1 - 2018

N2 - The main results of an experimental study of the effect of temperature and nanoparticle concentration on thermal conductivity and viscosity of a nanofluid are shown. The nanofluid was prepared with Octadecane, an alkane hydrocarbon with the chemical formula CH3(CH2)16CH3, as a base fluid and 75-nm CuO spherical nanoparticles. Since the base fluid is a phase change material (PCM) to be used in thermal storage applications, the engineered nanofluid is referred to as Nano-PCM. Three Nano-PCMs were prepared by the two-step method (2.5% w/v, 5.0% w/v, and 10.0% w/v). In order to increase the stability of the Nano-PCM, the surface of the CuO nanoparticles were modified with Sodium oleate, and it was verified by IR analysis. The modified CuO nanoparticles were dispersed with an ultrasonic horn. The thermal conductivity was measured with a thermal properties analyzer in the temperature range of 30–40 °C. The viscosity was measured in the temperature range of 30–55 °C. The results for the Nano-PCM showed that thermal conductivity is almost constant in the analyzed temperature range, and the viscosity decreases non-linearly with temperature. With respect to the effect of nanoparticle concentration, both thermal conductivity and viscosity increased with nanoparticle concentration. Thermal conductivity increased up to 9% with respect to the base fluid, and viscosity increased up to 60%, in both cases with increasing concentration. Finally, the viscosity measurements for different deformation rates (30–80 RPM) showed that the addition of nanoparticles modifies the rheological behavior of the base fluid, from a Newtonian to a shear thinning (power-law) non-Newtonian behavior. © 2017 Elsevier Ltd

AB - The main results of an experimental study of the effect of temperature and nanoparticle concentration on thermal conductivity and viscosity of a nanofluid are shown. The nanofluid was prepared with Octadecane, an alkane hydrocarbon with the chemical formula CH3(CH2)16CH3, as a base fluid and 75-nm CuO spherical nanoparticles. Since the base fluid is a phase change material (PCM) to be used in thermal storage applications, the engineered nanofluid is referred to as Nano-PCM. Three Nano-PCMs were prepared by the two-step method (2.5% w/v, 5.0% w/v, and 10.0% w/v). In order to increase the stability of the Nano-PCM, the surface of the CuO nanoparticles were modified with Sodium oleate, and it was verified by IR analysis. The modified CuO nanoparticles were dispersed with an ultrasonic horn. The thermal conductivity was measured with a thermal properties analyzer in the temperature range of 30–40 °C. The viscosity was measured in the temperature range of 30–55 °C. The results for the Nano-PCM showed that thermal conductivity is almost constant in the analyzed temperature range, and the viscosity decreases non-linearly with temperature. With respect to the effect of nanoparticle concentration, both thermal conductivity and viscosity increased with nanoparticle concentration. Thermal conductivity increased up to 9% with respect to the base fluid, and viscosity increased up to 60%, in both cases with increasing concentration. Finally, the viscosity measurements for different deformation rates (30–80 RPM) showed that the addition of nanoparticles modifies the rheological behavior of the base fluid, from a Newtonian to a shear thinning (power-law) non-Newtonian behavior. © 2017 Elsevier Ltd

KW - Copper oxide

KW - Nano-PCM

KW - non-Newtonian fluid

KW - Octadecane

KW - Thermal conductivity

KW - Viscosity

KW - Copper compounds

KW - Copper oxides

KW - Heat storage

KW - Lubrication

KW - Magnetic storage

KW - Nanofluidics

KW - Nanoparticles

KW - Non Newtonian flow

KW - Non Newtonian liquids

KW - Phase change materials

KW - Rheology

KW - Shear thinning

KW - Temperature

KW - Thermal conductivity of liquids

KW - Viscosity measurement

KW - Chemical formulae

KW - Effect of temperature

KW - Nanoparticle concentrations

KW - Non-Newtonian behaviors

KW - Non-Newtonian fluids

KW - Rheological behaviors

KW - Spherical nanoparticles

U2 - 10.1016/j.ijheatmasstransfer.2017.12.106

DO - 10.1016/j.ijheatmasstransfer.2017.12.106

M3 - Article

VL - 120

SP - 1009

EP - 1019

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

ER -