Abstract
Fluid flow and heat transfer analysis of Cu-H2O nanofluid in a square cavity using a Thermal Lattice Boltzmann Method (TLBM) have been studied in the present work. The LBM has built up on the D2Q9 model and the single relaxation time method called the Lattice-BGK (Bhatnagar-Gross-Krook) model. The effect of suspended nanoparticles on the fluid flow and heat transfer analysis have been investigated for different non dimensional parameters such as particle volume fraction (φ) and particle diameters (dp) in presence of internal heat generation (q) of nanoparticles. It is seen that flow behaviors and the average rate of heat transfer in terms of the Nusselt number (Nu) as well as the thermal conductivity of nanofluid are effectively changed with the different controlling parameters such as particle volume fraction (2% ≤ φ ≤ 10%), particle diameter (dp = 5 nm to 40 nm) with fixed Rayleigh number, Ra = 105. The present results of the analysis are compared with the previous experimental and numerical results for both pure and nanofluid and it is seen that the agreement is good indeed among the results.
Highlights
The term nanofluid is envisioned to describe a solid-liquid mixer which consists of nano-sized solid particles and a base liquid and this is one of new challenges for thermo-sciences provided by the nanotechnology
Fluid flow and heat transfer analysis of Cu-H2O nanofluid in a square cavity using a Thermal Lattice Boltzmann Method (TLBM) have been studied in the present work
The effect of suspended nanoparticles on the fluid flow and heat transfer analysis have been investigated for different non dimensional parameters such as particle volume fraction (φ) and particle diameters in presence of internal heat generation (q) of nanoparticles
Summary
The term nanofluid is envisioned to describe a solid-liquid mixer which consists of nano-sized solid particles and a base liquid and this is one of new challenges for thermo-sciences provided by the nanotechnology It has potential applications in the microelectromechanical systems (MEMS) and electronics cooling industries. The main goal of nanofluids is to achieve the maximum thermal properties with the minimum possibility of particle volume fractions (less than 1%) and size of particles (less than 10 nm) by uniform dispersion and stable suspension of nanoparticles in base fluids/liquids. A lattice Boltzmann model has been developed by Shan and Chen [13] to simulate the fluid flows containing multiple phases and components. Multi-component thermal Lattice-Boltzmann method (TLBM) is used for simulating natural convection H2OCu nanofluid with Boussinesq approximation in a square cavity considering the internal heat generation effect of Cu nanoparticles. The results of the analysis are compared with experimental and numerical data both for pure and nanofluids, and shown a relatively good agreement
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