Numerical simulation with sensitivity analysis of MHD natural convection using Cu-TiO2-H2O hybrid nanofluids

Islam, Md. Shahinur; Islam, Saiful; Siddiki, Md. Noor-A-Alam

doi:10.1016/j.ijft.2023.100509

Cited by 24 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 25# transformer oil and TiO 2 nanoparticle properties are presented in table 1. Owing to the maximum nanoparticle volume fraction of 5% considered in this study, the TiO 2 -25# transformer oil nanofluid is assumed to be a single-phase mixture with effective thermo-physical properties [44]. The expressions used to calculate the effective properties of nanofluids [44,45] are as follows: Effective density:…”

Section: Effective Properties Of Tio 2 -25# Transformer Oil Nanofluidsmentioning

confidence: 99%

Numerical analysis of electrothermoconvection of a dielectric nanofluid in a heated cavity

Yang,

Peng,

Ramachandran

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

A numerical analysis of electrohydrodynamic (EHD) flow and heat transfer of nanofluid in a heated rectangular cavity is presented. A two-dimensional (2D) rectangular cavity heated from the bottom is considered. An electric potential difference is applied vertically, with the bottom wall acting as a high-voltage electrode, and the top wall is grounded. TiO2-25# transformer oil nanofluid with nanoparticle volume fraction ranging from 0 - 5% is considered. The numerical model for EHD flow and heat transfer of nanofluid is implemented in the finite-volume method (FVM) based numerical framework of OpenFOAM. A single-phase approach based on the effective properties is adopted to model the nanofluids. A two-way coupled EHD flow model is employed to consider mutual interactions of flow and electric field variables. The flow and heat transfer behavior of nanofluids in the presence of an electric field is quantified with reference to the key parameters, electric Rayleigh number (T), and the nanoparticle volume fraction φ. The addition of nanoparticles increased the viscosity and marginally reduced the natural convective flow and heat transfer. However, EHD flow induced by the electric field aided in overcoming the weak natural convection flow in nanofluids. Results confirm that nanofluids' net effective heat transfer rates are notably increased in the presence of the electric field. For the parameters under consideration, combining electric fields with nanofluids led to a significant heat transfer enhancement of up to 32.3%. The present study showcases the feasibility of combining passive heat transfer enhancement using nanoparticles and active heat transfer enhancement using EHD flow.

show abstract

Section: Effective Properties Of Tio 2 -25# Transformer Oil Nanofluidsmentioning

confidence: 99%

Numerical analysis of electrothermoconvection of a dielectric nanofluid in a heated cavity

Yang,

Peng,

Ramachandran

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Due to its synergism, hybrid nanofluid exhibits higher thermal conductivity than traditional nanofluids. Recently, numerous researchers have done both numerically and experimentally to study the novel technological concept of hybrid nanofluids [21][22][23][24][25][26]. Chamkha et al [27] studied how well a hybrid nanofluid transferred heat over time in a semicircular chamber.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Sensitivity Analysis Using RSM on Natural Convective Heat Exchanger Containing Hybrid Nanofluids

Islam,

Siddiki,

Islam

2024

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

This work presents a numerical analysis for exploring heat transfer phenomena in an enclosed cavity using magnetohydrodynamics natural convection. Because of the numerous real-world applications of nanofluids and hybrid nanofluids in industrial and thermal engineering developments, hybrid nanofluids are used as fluid mediums in the fluid field. A hexagonal-shaped heat exchanger is taken with two circular surfaces along the middle part. The upright circular surface acts as a homogeneous heat source, while the lower circular surface functions as a heat sink. The remaining portions of the adjacent walls are thermally insulated. The copper (Cu) and titanium dioxide (TiO2) nanoparticles are suspended into water to make a hybrid nanofluid. For solving the corresponding governing equations, the weighted-residual finite element method is applied. To explain the major outcomes, isotherms, streamlines, and many others 2D and 3D contour plots are involved graphically with a physical explanation for different magnitudes of significant parameters: Rayleigh number 103≤Ra≤106, Hartmann number 0≤Ha≤100, and nanoparticle volume fraction 0≤ϕ≤0.06. The novelty of this work is to apply response surface methodology on the natural convective hybrid nanofluid model, to visualize 2D and 3D effects, and to study the sensitivity of independent parameters on response function. Due to the outstanding thermal properties of the hybrid nanofluid, the addition of Cu and TiO2 nanoparticles into H2O develops the heat transfer rate to 35.85% rather than base fluid. Moreover, a larger magnitude of Ra and the accumulation of mixture nanoparticles result in the thermal actuation of a hybrid nanofluid. With greater magnetic impact, an opposite response is exhibited.

show abstract

“…The findings show an important improvement in heat transfer efficiency: a 76.16% improvement in the Nu av as the Ra increases, and the optimal obstacle position significantly enhances the heat transfer. Islam et al [6] investigated the hybrid nanoliquid MHD NC in a prismatic cavity. The study highlighted an improvement of the thermal performance with an increase in the Ra and nanoparticle concentrations, while magnetic influence shows opposite effects.…”

Section: Introductionmentioning

confidence: 99%

Control of Three-Dimensional Natural Convection of Graphene–Water Nanofluids Using Symmetrical Tree-Shaped Obstacle and External Magnetic Field

Aich,

Hilali-Jaghdam,

Alshahrani

et al. 2024

Symmetry

View full text Add to dashboard Cite

This numerical investigation explores the enhanced control of the 3D natural convection (NC) within a cubic cavity filled with graphene–water nanofluids, utilizing a bottom-center-located tree-shaped obstacle and a horizontal magnetic field (MF). The analysis includes the effects of the Rayleigh number (Ra), the solid volume fraction of graphene (φ), the Hartmann number (Ha), and the fins’ length (W). The results show complex flow patterns and thermal behavior within the cavity, indicating the interactive effects of nanofluid properties, the tree-shaped obstacle, and magnetic field effects. The MHD effects reduce the convection, while the addition of graphene improves the thermal conductivity of the fluid, which enhances the heat transfer observed with increasing Rayleigh numbers. The increase in the fins’ length on the heat transfer efficiency is found to be slightly negative, which is attributed to the complex interplay between the enhanced heat transfer surface area and fluid flow disruption. This study presents an original combination of non-destructive methods (magnetic field) and a destructive method (tree-shaped obstacle) for the control of the fluid flow and heat transfer characteristics in a 3D cavity filled with graphene–water nanofluids. In addition, it provides valuable information for optimizing heat transfer control strategies, with applications in electronic cooling, renewable energy systems, and advanced thermal management solutions. The application of a magnetic field was found to reduce the maximum velocity and total entropy generation by about 82% and 76%, respectively. The addition of graphene nanoparticles was found to reduce the maximum velocity by about 5.5% without the magnetic field and to increase it by 1.12% for Ha = 100. Varying the obstacles’ length from W = 0.2 to W = 0.8 led to a reduction in velocity by about 23.6%.

show abstract

Numerical simulation with sensitivity analysis of MHD natural convection using Cu-TiO2-H2O hybrid nanofluids

Cited by 24 publications

References 37 publications

Numerical analysis of electrothermoconvection of a dielectric nanofluid in a heated cavity

Numerical analysis of electrothermoconvection of a dielectric nanofluid in a heated cavity

Numerical Simulation and Sensitivity Analysis Using RSM on Natural Convective Heat Exchanger Containing Hybrid Nanofluids

Control of Three-Dimensional Natural Convection of Graphene–Water Nanofluids Using Symmetrical Tree-Shaped Obstacle and External Magnetic Field

Contact Info

Product

Resources

About