Turbulent Heat Transfer and Pressure Drop Characteristics of Dilute Water Based Al₂O₃–Cu Hybrid Nanofluids

Abstract

A study on fully developed turbulent convective heat transfer and pressure drop characteristics of Al2O3-Cu/water hybrid nanofluid flowing through a uniformly heated circular tube is presented in this paper. For this, Al2O3-Cu nanocomposite powder was synthesized in a thermo chemical route using hydrogen reduction technique and dispersed the hybrid nano powder in deionised water to form a stable hybrid nanofluid of 0.1% volume concentration. The prepared powder was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) to confirm the chemical composition, determine the particle size and study the surface morphology. Stability of the nanofluid was ensured by pH and zeta potential measurements. The average heat transfer enhancement for Al2O3-Cu/water hybrid nanofluid is 8.02% when compared to pure water. The experimental results also showed that 0.1% Al2O3-Cu/water hybrid nanofluids have slightly higher friction factor compared to 0.1% Al2O3/water nanofluid. The empirical correlations proposed for Nusselt number and friction factor were well agreed with the experimental data.

Exergy and energy amelioration for parabolic trough collector using mono and hybrid nanofluids

“…The literature survey showed an increase in the research number related to predicting thermal properties, enhance stability, main challenges, and application that used HNF as an improvement method [26]. Suresh et al [27][28][29] examined HNF of inserting Al 2 O 3 -Cu with a base fluid of water in a three separately researches. These researches studied the following: first, preparing the HNF and, second, reporting the experimental results of thermal conductivity and the viscosity under variable volume fraction (0.1, 0.33, 0.75, 1, and 2%) for the fraction mass nanopowder 90:10 for Al 2 O 3 and Cu [27].…”

“…These researches studied the following: first, preparing the HNF and, second, reporting the experimental results of thermal conductivity and the viscosity under variable volume fraction (0.1, 0.33, 0.75, 1, and 2%) for the fraction mass nanopowder 90:10 for Al 2 O 3 and Cu [27]. Second and third researches investigated a friction factor and Nusselt number under turbulent and laminar flow for the same HNF under constant volume concentration equal 0.1% [28,29]. The resulted HNF from mixing binary base fluid of water/ethylene glycol (EG) with a variable mixture ratio of hybrid nanoparticle of TiO 2 -SiO 2 was examined under the turbulent regime by Hamid et al [30].…”

Stagnation flow of hybrid nanoparticles with MHD and slip effects

“…Madhesh et al studied about rheological and convective heat transfer properties of hybrid nanoparticles. Suresh at al studied the pressure drop and turbulent heat transfer properties of hybrid nanoparticles having pure water as base fluid. He observed that improvement in heat transfer of hybrid nanoparticles (8.02%) is more than nanofluid.…”

Heat Transfer Performance of EG-Water Based Fe3O4 and its Hybrid Nanofluids in a Double Pipe Heat Exchanger

“…Based on the literature survey it is understood that the stability of nanofluid is better in EG-Water based nanofluids compared to that of EG-based nanofluids. Suresh et al [10] studied heat transfer and pressure drop characteristics of Al 2 O 3 -Cu hybrid nanocomposite dispersed in water nanofluid experimentally in a uniformly heated circular tube for 0.1% volume concentration, with Reynolds number ranging from 3000 to 12000. The study revealed that the average increase in Nusselt number for Al 2 O 3 -Cu/Water nanofluid was 8.02% when compared to pure water, whereas the enhancement obtained for Al 2 O 3 /water nanofluid was 5.16% when compared to pure water.…”