Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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Research Article, J Nanomater Mol Nanotechnol Vol: 7 Issue: 6

A New Method for Analysis of Anomalous Increases in Thermal Conductivity of TiO2-Water Nanofluid

Mohammad Allahyari1*, Kamal Abbaspoursani2, Isak Kotcioglu1 and Mansour Nasiri Khalaji1

1Ataturk University, Faculty of Engineering, Department of Mechanical Engineering, Erzurum, Turkey

2Islamic Azad University Takestan Branch, Faculty of Engineering, Department of Mechanical Engi neering, Takestan, Iran

*Corresponding Author : Mohammad Allahyari
Ataturk University, Faculty of Engineering, Department of Mechanical Engineering, Erzurum, Turkey
Tel: +90 (551) 193 0950
E-mail: [email protected]

Received: March 23, 2018 Accepted: July 06, 2018 Published: July 12, 2018

Citation: Allahyari M, Abbaspoursani K, Kotcioglu I, Khalaji MN (2018) A New Method for Analysis of Anomalous Increases in Thermal Conductivity of TiO2-Water Nanofluid. J Nanomater Mol Nanotechnol 7:6. doi: 10.4172/2324-8777.1000253

Abstract

Thermal conductivity is an important characteristic of a nanofluid. This paper presents models for the prediction of the effective thermal conductivity of titanium oxide based on water by used of dimensionless groups. The models express the thermal conductivity of a nanofluid as a function of the thermal conductivity of interfacial shell, interfacial thickness and volume fraction. The model of effective thermal conductivity is divided into four regions by analysis of present models for the regions and can be obtained an effective value of dependence parameter. The model showed for volume fraction less than 1% and diameters less than 20 nm intensity of increase thermal conductivity is much more than other region. As we know, with decrease of concentration, the viscosity of nanofluid decreased, so this region is the best region for application of heat transfer devices because the pressure drop also decreased.

Keywords: Critical particle size; TiO2-water nanofluid; Interfacial shell; Thermal conductivity

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