MARANGONI CONVECTION FLOW OF CNTs-Al2O3-WATER HYBRID NANOFLUIDS WITH VARIABLE FLUID PROPERTIES

Manghat, Radhika; Manjunatha, S.; Baby, Ammani Kuttan; Basappa, Sidda

doi:10.1615/nanoscitechnolintj.2020033931

Cited by 3 publications

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“…For the desired output, it is important that proper cooling fluid is chosen and the flow of the cooling liquid caused due to the stretching sheet can be controlled. In this regard, Kuttan et al, [39][40][41] have extensively contributed to the field of hybrid nanofluid. They have analyzed the unsteady flow of hybrid nanofluid under various conditions and have also analyzed the impact of free convection and Marangoni convection on the flow of hybrid nanofluid.…”

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confidence: 99%

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

2021

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In recent times, Au nanoparticles have been commonly used for delivering the drug especially in the case of hypothermia of tumors, but low absorption of IR light does not solve destruction of tumor cells. However, nanoparticles such as Fe3O4 coated with Au could be used to deliver the drug to a specific spot due to applied external magnetic field. Due to these applications, boundary layer approximation is invoked to simplify the mathematical model. This paper presents the nanoparticle shape analysis and heat transfer features of the Au–Fe3O4–blood hybrid nanofluid flowing past a stretching surface on a magnetohydrodynamic medium. Numerical solutions of nonlinear differential equations are obtained by RKF‐45 method with the help of shooting technique. The behavior of emerging parameters is described graphically for velocity and temperature profiles. It is found that the blade‐shaped Au and Fe3O4 nanoparticles have better thermal conductance than brick, sphere, cylinder, needle, and platelet shapes. It is also observed that the Lorentz force generated due to magnetic field helps in controlling the flow and enhance the thermal conductivity of hybrid nanofluid.

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Section: Introductionmentioning

confidence: 99%

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

2021

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Effects of Nanoparticle Size on Properties of Nanofluid and Heat Transfer Enhancement in Spiral Exchanger Using Turbulators

Muratçobanoğlu

Afshari²

2023

Nano Sci Technol Int J

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In energy systems that use nanofluids as heat transfer fluid, the physical properties of nanofluids are important parameters in the efficiency of various heat exchangers, including small-scale micro channels or large-scale heat exchangers. In the present work, a comprehensive study is conducted to evaluate the thermal performance of a spiral heat exchanger with ball-type turbulators using nanofluid Al2O3/water. To investigate the effect of particle dimensions on nanofluid properties, nanoparticles with sizes of 20 nm and 50 nm at a volume concentration of 2% were examined. Heat transfer rate in the heat exchanger, performance evaluation criteria, heat transfer coefficient value, pressure drop, friction factor, Reynolds-Nusselt numbers relationship and pump power for fluid circulation have been calculated. ANSYS Fluent software as a computational fluid dynamic method was utilized to analyze the spiral heat exchanger under different working conditions. It was observed that both thermal conductivity and viscosity values increased as the nanoparticle size decreased. Heat transfer coefficient analyses showed that nanofluids with 20 and 50 nm particles exhibited a maximum improvement of 30.59% and 21.53%, respectively, when compared to pure water at an inlet velocity of 0.1 m/s. Additionally, the heat exchanger with turbulator showed a maximum increase of 24.87% at an inlet velocity of 0.5 m/s compared to the heat exchanger without turbulator. Moreover, maximum heat transfer rate enhancement was found to be 14.07% when the exchanger was equipped with turbulators.

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HYDROMAGNETIC PULSATING FLOW OF A BLOOD-Al2O3+CuO HYBRID NANOFLUID IN A POROUS CHANNEL WITH THERMAL RADIATION

Reddy,

Srinivas,

Jagadeshkumar

et al. 2024

Nano Sci Technol Int J

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This study examines the biohybrid nanofluid flow between two permeable walls exposed to a time-dependent pressure gradient with radiative heat and an applied magnetic field. The significance of heat production/absorption and Ohmic discharge is presented. Blood was picked as the conventional fluid, referred to as the Casson fluid. Nanoparticles of copper oxide (CuO) and alumina (Al2O3) are suspended in the base fluid. The perturbation approach is incorporated to arrive at analytical answers for flow transport equations. It has been investigated how emerging factors affect velocity, temperature, and heat transfer rate, comparing hybrid and conventional nanofluids. The findings demonstrate that as thermal radiation and the volume proportion of nanoparticles rise, so do temperature and heat transfer rate.

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MARANGONI CONVECTION FLOW OF CNTs-Al2O3-WATER HYBRID NANOFLUIDS WITH VARIABLE FLUID PROPERTIES

Cited by 3 publications

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The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

Effects of Nanoparticle Size on Properties of Nanofluid and Heat Transfer Enhancement in Spiral Exchanger Using Turbulators

HYDROMAGNETIC PULSATING FLOW OF A BLOOD-Al2O3+CuO HYBRID NANOFLUID IN A POROUS CHANNEL WITH THERMAL RADIATION

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MARANGONI CONVECTION FLOW OF CNTs-Al2O3-WATER HYBRID NANOFLUIDS WITH VARIABLE FLUID PROPERTIES

Cited by 3 publications

References 0 publications

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe3O4 Casson hybrid nanofluid

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe3O4 Casson hybrid nanofluid

Effects of Nanoparticle Size on Properties of Nanofluid and Heat Transfer Enhancement in Spiral Exchanger Using Turbulators

HYDROMAGNETIC PULSATING FLOW OF A BLOOD-Al2O3+CuO HYBRID NANOFLUID IN A POROUS CHANNEL WITH THERMAL RADIATION

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The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid

The analogy of nanoparticle shapes on the theory of convective heat transfer of Au–Fe₃O₄ Casson hybrid nanofluid