Modified Arrhenius and Thermal Radiation Effects on Three-Dimensional Magnetohydrodynamic Flow of Carbon Nanotubes Nanofluids Over Bi-Directional Stretchable Surface

2021 ◽  
Vol 10 (4) ◽  
pp. 538-551
Author(s):  
Himanshu Upreti ◽  
Alok Kumar Pandey ◽  
Sawan Kumar Rawat ◽  
Manoj Kumar
Keyword(s):  
Thermal Conductivity ◽  
Ethylene Glycol ◽  
Thermal Radiation ◽  
Radiation Effects ◽  
Three Dimensional ◽  
High Rate ◽  
Engine Oil ◽  
Brownian Diffusion ◽  
Thermal Conductivity Model ◽  
Higher Temperature

In the current study, 3D hydro-magnetic flow of CNTs-EG/EO/H2O nanofluids over bi-directional stretchable surface along with linear thermal radiation, modified Arrhenius, thermophoresis and Brownian diffusion are studied. The three base fluids i.e., EG (Ethylene Glycol), EO (Engine Oil) and H2O are considered for the analysis. For computing the effective viscosity and thermal conductivity of nanofluid, Wang’s viscosity model and Hamilton-Crosser’s thermal conductivity model have been used. The system of transformed non-linear ODEs is solved by shooting scheme. The comparison of heat transfer rate in CNTs-EG, CNTs-EO and CNTs-H2O nanofluids is depicted by bar diagrams. The outcomes of the present work showed that MWCNTs based nanofluids have a higher temperature gradient compared to that of SWCNTs based nanofluids. Moreover, temperature distribution corresponding to the engine oil-based nanofluids declined at a very high rate followed by ethylene glycol and water-based nanofluids, respectively.

scholarly journals Empirical correlations to predict thermophysical and heat transfer characteristics of nanofluids

2008 ◽  
Vol 12 (2) ◽  
pp. 27-37 ◽  
Author(s):  
Vasu Velagapudi ◽  
Krishna Konijeti ◽  
Kumar Aduru
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Ethylene Glycol ◽  
Volume Fraction ◽  
Solid Particles ◽  
Engine Oil ◽  
Fluid Temperature ◽  
Flow Conditions ◽  
Thermophysical Characteristics ◽  
Laminar And Turbulent Flow

Nanofluids exhibits larger thermal conductivity due to the presence of suspended nanosized solid particles in them such as Al2O3, Cu, CuO,TiO2, etc. Varieties of models have been proposed by several authors to explain the heat transfer enhancement of fluids such as water, ethylene glycol, engine oil containing these particles. This paper presents a systematic literature survey to exploit the thermophysical characteristics of nanofluids. Based on the experimental data available in the literature empirical correlation to predict the thermal conductivity of Al2O3, Cu, CuO, and TiO2 nanoparticles with water and ethylene glycol as base fluid is developed and presented. Similarly the correlations to predict the Nusselt number under laminar and turbulent flow conditions is also developed and presented. These correlations are useful to predict the heat transfer ability of nanofluids and takes care of variations in volume fraction, nanoparticle size and fluid temperature. The improved thermophysical characteristics of a nanofluid make it excellently suitable for future heat exchange applications. .

Numerical Investigation for Convective Heat Transfer of CNT Nano-Fluids over a Stretching Surface

2019 ◽  
Vol 961 ◽  
pp. 148-155
Author(s):  
Muhaimin Ismoen ◽  
Radiah Bte Mohamad ◽  
R. Kandasamy ◽  
Suliadi Firdaus Sufahani ◽  
Fazlul Karim ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Ethylene Glycol ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Engine Oil ◽  
Magnetic Field Effects ◽  
Conductivity Enhancement ◽  
Similarity Transformations ◽  
Nano Fluids

The performance of carbon nanotube (CNT) nanofluids on convective heat transfer over a stretching sheet was investigated under thermal stratification and magnetic field effects. Water, engine oil and ethylene glycol are used as the base fluids. The governing equations are transformed into a system of coupled nonlinear ordinary differential equations using similarity transformations and solved numerically using the fourth-order Runge–Kutta–Fehlberg in conjunction to shooting method. The CNT nanofluids with an engine oil base fluid shows the highest thermal conductivity in comparison to ethylene glycol and water, respectively. Potential application of the thermal conductivity enhancement of CNT nanofluid is to increase the energy-efficient mechanical systems in heating, cooling and ventilation of the indoor environment.

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