Specific heat of metal oxide nanofluids at high concentrations for heat transfer

Cabaleiro, David; Gracia-Fernández, Carlos; Legido, J.L.; Lugo, Luis

doi:10.1016/j.ijheatmasstransfer.2015.04.107

Cited by 115 publications

(51 citation statements)

References 73 publications

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“…In order to perform these analyses, the experimental values of thermal conductivity, dynamic viscosity, and density were utilized, while specific heat capacities were obtained by using the following weighted average equation [82]: …”

Section: Resultsmentioning

confidence: 99%

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0.50% by using a transient plate source, a rotational rheometer, and a vibrating-tube technique, respectively. Thermal conductivity enhancements reach up to 5% without a clear effect of temperature while rheological tests evidence a Newtonian behavior of the studied nanofluids. Different equations such as the Nan, Vogel-Fulcher-Tamman (VFT), or Maron-Pierce (MP) models were utilized to describe the temperature or nanoparticle concentration dependences of thermal conductivity and viscosity. Finally, different figures of merit based on the experimental values of thermophysical properties were also used to compare the heat transfer capability and pumping power between nanofluids and base fluid.

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Section: Resultsmentioning

confidence: 99%

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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“…However, as the volume fraction of the nanoparticle increases, the heat capacity further decreases [139]. Similarly, the specific heat of water and ethylene glycol mixture based MgO, ZnO, and ZrO 2 nanofluids were investigated, and it was observed that although the nanofluids showed a 30% increase in specific heat compared to their base fluids, it still decreases with increasing nanoparticles' volume fraction [140]. Several researchers conducted similar studies and all of them reported the same behavior across a variety of nanofluids [141][142][143][144].…”

Section: Effect Of Nanoparticle's Size and Concentration Onmentioning

confidence: 99%

Critical Review on Nanofluids: Preparation, Characterization, and Applications

Jama

Singh

Gamaleldin

et al. 2016

Journal of Nanomaterials

121

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Heat transfer fluids are a crucial parameter that affects the size and costs of heat exchangers. However, the available coolants like water and oils have low thermal conductivities, which put many limitations to the development of heat transfer to achieve high performance cooling. The need for development of new classes of fluids which enhance the heat transfer capabilities attracted the attention of many researchers. In the last few decades, modern nanotechnology developed nanoparticles, which have unique thermal and electrical properties that could help improve heat transfer using nanofluids. A “nanofluid” is a fluid with suspended fine nanoparticles which increases the heat transfer properties compared with the original fluid. Nanofluids are considered a new generation of heat transfer fluids and are considered two-phase fluids of liquid solid mixtures. The efficiency of the fluid could be improved by enhancing its thermal properties, especially the thermal conductivity, and it is expected that the nanofluids will have a greater thermal conductivity than the base fluids. This paper reviews the preparation of metallic and nonmetallic nanofluids along with the stability of the produced nanofluids. Physical and thermal properties as well as a range of applications are also discussed in detail.

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“…Generally, the specific heat capacity of nanofluids decreases with particle volume fraction, meaning less heat is required to increase the temperature of the nanofluids at higher concentration [269]. Again, experimental results show that nanofluids possess lower specific heat compared to their basefluids [270]. Sabiha et al [33] estimated the specific heat of water-based SWCNT at 0.05-0.25 vol % fractions with SDS as surfactant (Fig.…”

Section: Effect Of Stability On Specific Heat Capacity Of Nanofluidsmentioning

confidence: 99%

Stability of Heat Transfer Nanofluids – A Review

2018

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Nanofluids are suspension of highly conductive nano‐sized particles in conventional fluids that may be applicable as ultrafast cooling agent to extend the thermal performance of cooling devices. However, before considering the feasibility as coolant for high heat flux components, a thorough investigation of the long‐term stability of nanofluids is of paramount importance. Preparation of extremely stable nanofluids has become one of the main technical challenges. The present contribution aims to summarize the recent developments in the preparation, characterization, and stabilization of nanofluids based on the information available in literatures. Lastly, existing needs and attainable solution to challenges, leading to the upcoming research in the development of highly stable nanofluids, are discussed.

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Specific heat of metal oxide nanofluids at high concentrations for heat transfer

Cited by 115 publications

References 73 publications

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Critical Review on Nanofluids: Preparation, Characterization, and Applications

Stability of Heat Transfer Nanofluids – A Review

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