Dynamic contact angle of water-based titanium oxide nanofluid

Milad Radiom,Chun Yang,Weng Kong Chan

doi:10.1186/1556-276x-8-282

Milad Radiom, Chun Yang + Show 1 more

Open Access

https://doi.org/10.1186/1556-276x-8-282

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Abstract

This paper presents an investigation into spreading dynamics and dynamic contact angle of TiO2-deionized water nanofluids. Two mechanisms of energy dissipation, (1) contact line friction and (2) wedge film viscosity, govern the dynamics of contact line motion. The primary stage of spreading has the contact line friction as the dominant dissipative mechanism. At the secondary stage of spreading, the wedge film viscosity is the dominant dissipative mechanism. A theoretical model based on combination of molecular kinetic theory and hydrodynamic theory which incorporates non-Newtonian viscosity of solutions is used. The model agreement with experimental data is reasonable. Complex interparticle interactions, local pinning of the contact line, and variations in solid–liquid interfacial tension are attributed to errors.

Highlights

Industrial operations such as spin coating, painting, and lubrication are based on spreading of fluids over solid surfaces
This paper presents an investigation into spreading dynamics and dynamic contact angle of TiO2-deionized (DI) water nanofluids
Solid–liquid interfacial tension increases which on the other hand enhances the equilibrium contact angle [21]

Summary

Introduction

Industrial operations such as spin coating, painting, and lubrication are based on spreading of fluids over solid surfaces. The same study on liquids laden with metallic and oxide nanoparticles such as silver, copper, zinc oxide, and titanium oxide is scarce. These fluid suspensions are termed as nanofluids after the seminal work by Choi and Eastman [15]. The application of nanofluids is coined with enhanced heat transfer performance compared with their base fluids. They are proposed for applications in cooling of electronic devices, ventilation and air conditioning, and biomedical applications [14,16,17,18,19,20,21,22,23,24]

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