Numerical investigations of laminar heat transfer and flow performance of Al 2 O 3 –water nanofluids in a flat tube

Zhao, Ningbo; Yang, Jian; Li, Hui; Zhang, Ziyin; Li, Shuying

doi:10.1016/j.ijheatmasstransfer.2015.08.098

Cited by 86 publications

(26 citation statements)

References 84 publications

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“…The Buongiorno model 13 implies that the Brownian diffusion and thermophoresis are the most prominent parameters the characteristise nanofluid flows. Recently, work on convective boundary layer flow in nanofluids include Ghanbarpour et al, 23 Li et al, 24 Vanaki et al, 25 Zhao et al, 26 Serna,27 Mohyud-Din 28 and others. Ferdows et al 29 investigated radiative magnetohydrodynamic nano-polymer stretching flows.…”

Section: Introductionmentioning

confidence: 99%

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

et al. 2016

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A mathematical model is presented for three-dimensional unsteady boundary layer slip flow of Newtonian nanofluids containing gyrotactic microorganisms over a stretching cylinder. Both hydrodynamic and thermal slips are included. By applying suitable similarity transformations, the governing equations are transformed into a set of nonlinear ordinary differential equations with appropriate boundary conditions. The transformed nonlinear ordinary differential boundary value problem is then solved using the Runge-Kutta-Fehlberg fourth-fifth order numerical method in Maple 18 symbolic software. The effects of the controlling parameters on the dimensionless velocity, temperature, nanoparticle volume fractions and microorganism motile density functions have been illustrated graphically. Comparisons of the present paper with the existing published results indicate good agreement and supports the validity and the accuracy of our numerical computations. Increasing bioconvection Schmidt number is observed to depress motile micro-organism density function. Increasing thermal slip parameter leads to a decrease in temperature. Thermal slip also exerts a strong influence on nano-particle concentration. The flow is accelerated with positive unsteadiness parameter (accelerating cylinder) and temperature and micro-organism density function are also increased. However nano-particle concentration is reduced with positive unsteadiness parameter. Increasing hydrodynamic slip is observed to boost temperatures and micro-organism density whereas it decelerates the flow and reduces nano-particle concentrations. The study is relevant to nano-biopolymer manufacturing processes.

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Section: Introductionmentioning

confidence: 99%

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

et al. 2016

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“…et.al. [7], studied the Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al 2 O 3,/ water nanofluid heat transfer and flow in circular tubes fitted with dimpled twisted tape inserts, and Al 2 O 3,/ water nanofluid is employed. Considering the effects of dimples, protrusions, nanofluid volume fraction a and nanoparticle diameter deep, The results show that dimple side and protrusion side, both realize great heat transfer enhancement, and dimple side behave better compared with protrusion side.…”

Section: Nanoparticles and Nanoparticles Needmentioning

confidence: 99%

Review on Performance Analysis of Shell and Tube Heat Exchanger by using Al2O3 & CuO Nanofluid

Raut¹

2018

IJRASET

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“…Zhao et al [16] also conducted numerical analysis of Al2O3/water nanofluids in flat tube and reported that when liquid inlet velocity through tube is increased enhancement percentage diminishes at all concentrations. Particle volume concentration between 1 to 6 % was analysed throughout study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Heat and Fluids Flow Performance of Cuo-nanofluids in Flat Tube with Bend

Kumar¹,

Sokhal²,

Sharma³

2019

RCMA

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Main objective behind this work is to study and analyze the performance of copper-oxide nanofluids with water as base fluid in the flat tube bent through 90⁰ and inlet flow temperature of 40 ℃. The simulation has been carried out using Finite volume method under Reynolds number existing between 1000-5000 and volume concentrations betweenPerformance of flat tube bent at 90⁰ was compared with performance of straight flat tube under same conditions. The various thermo-physical properties i.e. density, thermal conductivity, viscosity and specific heat capacity has been determined with well-developed models of each presented during previous studies carried out in the field of nanofluids. It was observed during this study that heat performance of nanofluids under different volume concentrations between 0.1 % to 0.4 % v/v of nanoparticles is better than that of base fluids and also increased by almost 19-20 % due to presence of bend in between flat tube. The pressure drop is also increased by with use of nanofluids. The study also proves that use of nanofluids can play very important role in decreasing overall size of heat transfer systems.

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Numerical investigations of laminar heat transfer and flow performance of Al 2 O 3 –water nanofluids in a flat tube

Cited by 86 publications

References 84 publications

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

Review on Performance Analysis of Shell and Tube Heat Exchanger by using Al2O3 & CuO Nanofluid

Numerical Analysis of the Heat and Fluids Flow Performance of Cuo-nanofluids in Flat Tube with Bend

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