Heat and mass transfer analysis for magnetized flow of $${\mathrm{ZnO}-SAE50}$$ nanolubricant with variable properties: an application of Cattaneo–Christov model (2025)

Effect of ZnO Nanoparticles on the Thermo-Physical Properties and Heat Transfer of Nano-Fluid Flows

International Journal of Heat and Technology, 2020

In this research, an improvement in alternative heat transfer and thermal properties of ZnO nanoparticles (NPs)/ distilled water, DW nanofluid are experimentally studied and investigated. The two-step approach is utilized to prepare the ZnO NPs/water nanofluid using different concentrations and different inlet temperatures. Scanning Electron Microscopy (SEM) and UV–visible spectrophotometer is employed to characterize the nanofluid. Varying flow rates and the temperatures are examined in the heat exchanger's horizontial tube and shell pipe as well as the impacts of ZnO nanoparticles and the temperatures are studied on nanofluid's thermal conductivity and viscosity. The findings show improvements in the thermal conductivity of ZnO NPs / DW nanofluid. A maximum value of 6.67% of the thermal conductivity is achieved at a temperature of 343K using 1 % ZnO NPs. Nusselt Number also shown an improvement of 38% at a temperature of 343K using 0.2% wt of ZnO NPs under the turbulent co...

Heat and mass transport phenomena of nanoparticles on time-dependent flow of Williamson fluid towards heated surface

Neural Computing and Applications

An enhancement in the thermal conductivity of conventional base fluids has been a topic of great concern in recent years. An effective way to improve the heat transfer rate of conventional base fluids is the suspension of solid nanoparticles. In this framework, a theoretical study is performed to analyse the heat and mass transfer performance in the time-dependent flow of non-Newtonian Williamson nanofluid towards a stretching surface. There exist several studies focusing on the flow of Williamson fluid by assuming zero infinite shear rate viscosity. Nonetheless, there is a lack of knowledge regarding mathematical formulation for two-dimensional flow of the Williamson fluid by taking into account the impacts of infinite shear rate viscosity. In the current review, the Buongiorno model for nanofluids associated with Brownian motion and thermophoretic diffusion is employed to describe the heat transfer performance of nanofluids. The thermal system is composed of flow velocity, temperature, and nanoparticles concentration fields, respectively. The governing dimensionless equations are solved numerically by Runge-Kutta Fehlberg integration method. The numerical results are compared with published results and are found to have an excellent agreement. Effects of numerous dimensionless parameters on velocity, temperature, and nanoparticle concentration field together with the skin friction coefficient and rates of heat and mass transfer are presented with the assistance of graphical and tabular illustrations. With this analysis, we reached that the thermal boundary layer thickness as well as the nanofluids temperature has higher values with increase in thermophoresis and Brownian motion. It is further observed that the rate of heat transfer is significantly raised with an increment in Prandtl number and unsteadiness parameter.

Enhancement of heat transfer properties for ZnO/water nanofluid in heat exchange applications

AIP Conference Proceedings, 2018

A brief review of some previous studies on the use of nanoparticles has been conducted. Some studies have presented the methods of preparing these fluids in different ways by looking at the different thermal properties of thermal conductivity, viscosity, density and specific heat. These properties are governed by Zinc Oxide (ZnO) nanoparticle that based on nano-fluids and their applications. In present work, some of methods and applications for nanofluids are summarized, also the procedure for formation of resistant nano-fluids. Empirical and analysis studies were investigated on ZnO nanoparticle for evaluating thermal hydraulic performance in heat exchangers and preparing samples of high quality and more stable. In spite of, many defies and problems not clear on nano-fluids which need to be emancipated using empirical applications.

Physical assessments on variable thermal conductivity and heat generation/absorption in cross magneto-flow model

Journal of Thermal Analysis and Calorimetry, 2019

The present work focused here is a mixed convective MHD flow of cross fluid in the presence of heat generation/absorption and variable thermal conductivity over a bidirectional stretchable sheet. To elaborate the mechanism of heat transfer is analyzed in view of non-Fourier heat flux based upon Cattaneo-Christov theory. The influence of a simple isothermal model of homogeneous-heterogeneous reactions is further used for solute concentration. As a result, the relevant Buongiorno fluid model is utilized in mathematical modeling and then it is simplified through lubrication technique. By using appropriate transformations, the raised PDEs initially converted to ODEs. Convergent solutions of ODEs are obtained by the implementation of the numerical procedure bvp4c technique. However, the velocity, temperature and concentration profiles have been sketched by distinct physical flow parameter. Drag coefficients and heat transport are also computed numerically. Our results reveal that temperature profile has an inverse relation between the relaxation parameter and variable thermal conductivity.

Numerical treatment of time dependent magnetohydrodynamic nanofluid flow of mass and heat transport subject to chemical reaction and heat source

Alexandria Engineering Journal, 2021

Simulation Analysis of Mass and Heat Transfer Attributes in Nanoparticles Flow subject to Darcy-Forchheimer Medium

Scientia Iranica

In the concerned work, a model is developed to analyze the influence of chemical reaction in a Darcy-Forchheimer nanofluid mass and heat transfer flow over a nonlinearly extending surface with the effect of non-uniform magnetic force. Further, it is presumed that the fluid is viscous and incompressible. A powerful tool of similarity variables is exploited to transform the governing flow model PDEs into ordinary ones which are then solved with the aid of the SOR technique using MATLAB software. Our outcomes are linked with those presented in earlier literature and found to be in a good connect with them. The influences of different involved parameters are examined and visualized through tables and diagrams. From the current investigation, it is revealed that the chemical reaction causes an enhancement in the mass transfer rate whereas the Forchheimer parameter tends to devaluate the mass as well as heat transport rate on the surface.

Synthesis and application of ZnO rod-shaped nanoparticles for the optimal operation of the plate heat exchanger

Physics of Fluids

ZnO nanoparticles with tunable morphology exhibit attractive behaviors in transport phenomena, which make them valuable for thermal applications. The present study focuses on the synthesis and application of ZnO nanoparticles with two different shapes for the preparation of the working heat transfer nanofluid. First, the rod-shaped and spherical-shaped nanoparticles were synthesized by simple chemical methods and then ultrasonically dispersed in pure water to prepare a set of stable nanofluids with concentrations between 0.2% and 1% of nanoparticles. The nanofluid samples were analyzed thermo-physically to obtain the optimal nanoparticles volume fraction for presenting the best thermal properties. In the following, a brazed plate heat exchanger was examined to evaluate the heat transfer characteristics of the selected nanofluids as a coolant fluid at flow rates between 1 and 3.5 l/min. The experimental results showed that the lowest Prandtl number appeared at the volume fraction of ...

Convective Heat Transfer Study of ZnO Nanofluids and a Comparison with the Conventional Coolant Water

2016

In this era, the utilization of automobiles is increasing rapidly. So, it is a task for the automobile industries to yield well-ordered cooling system, which is actually responsible to carry waste heat of engine to atmosphere for effective working of an internal combustion engines. In this research, car radiator was tested by the water based Nano fluids to increase its heat transfer capacity and new experimental results were reported. Zinc Oxide nanofluids were prepared and tested by adding their nanoparticles in water with different volume fractions (0.1, 0.2, 0.3 and 0.4)%. Experimentally, effect of these concentrations were observed by varying a fluid flow rate from 4 liter per minute to 1 liter per minute and inlet temperature of fluid entering in radiator was kept constant at 80 o C and enhancement in heat transfer was observed from 46% to 70% by using ZnO Nano Fluid having volumetric concentration 0.2%. Increase in volumetric concentration had shown the enhancement of heat tr...

Effect of Biot Number on Convective Heat Transfer of Darcy- Forchheimer Nanofluid Flow over Stretched Zero Mass Flux Surface in the Presence of Magnetic Field

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2019

This work examined magneto-hydrodynamics flow of aluminum oxide-water based saturated in porous media that characterized by the Darcy-Forchheimer model. Heat transfer mechanism was analyzed in the presence of convective heating process and zero mass flux condition. Tiwari-Das model is employed to study the characteristics of nanofluid. A uniform magnetic field was imposed and a linear stretching surface was used to generate the flow. Application of appropriate transformation yields nonlinear ordinary differential equation through nonlinear Navier-Stokes equations and solved by Runge-Kutta Fehlberg shooting technique. Importance of influential variables such as velocity, temperature and concentration were elaborated graphically. Biot number, porosity, Forchheimer number and nanoparticle volume fraction parameters under various magnetic field and local Nusselt number were calculated numerically and interpreted. The results indicate that the effect of magnetic field is dominant on boundary layer thickness with respect to Biot number, porosity and nanoparticle volume fraction effect on temperature and nanoparticle concentration profile. An increase in Biot number, improvement in temperature distribution and nanoparticle concentration. The velocity distribution is decreased when there is an increase in the Forchheimer number and porosity parameters.

HEAT TRANSFER ENHANCEMENT OF NANO FLUIDS –A REVIEW

Thermal conductivity is considered important factor for rapid cooling and heating application. Base heat transfer fluid normally having low thermal conductivity, so we goes to Nano fluid for increases the heat transfer rate. Nano fluid is nanometre sized particle such as metal, oxide, and carbide etc., dispersed into base heat transfer fluid. In this paper shows varying factor affecting the thermal conductivity of Nano fluid at different conditions. All researcher tried to increase the heat transfer rate by considering thermal conductivity Nano fluid. Thermal conductivity is increased with increasing concentration of metal particle within critical limit. Thermal conductivity is affected by the following parameters like shape, size, clustering, collision, porous layer, melting point of nanoparticle etc., controlling this type of parameters to increase the thermal conductivity of Nano fluid. Nano fluid is advanced heat transfer fluid for next generation.