Showing papers on "Thermal radiation published in 2022"

Dynamism of a hybrid Casson nanofluid with laser radiation and chemical reaction through sinusoidal channels

Abstract: This article studies the impact of laser radiation and chemical reaction with electromagnetic field and electroosmotic flow of hybrid non-Newtonian fluid via a sinusoidal channel. A mathematical model is used to simulate the arisen non-linear partial differential equations (PDEs). By employing the suitable transformations, the system of PDEs is then transformed to a non-linear system of ordinary differential equations (ODEs). The impact of the pertinent parameters on the pressure rise, velocity profile, streamlines and temperature distribution has been discussed. It has been noticed that the laser parameter enhances the fluid flow and the temperature distribution. This result occurs due to the impact of laser radiation that decreases the blood viscosity which in turn implies an increase in the fluid velocity leading to an enhancement in the heat transfer inside the fluid layers. The technique of laser radiation plays an important role in treating many viral and autoimmune diseases. The current study of radiation has the intention to help inhibit bacterial growth, increase oxygen binding to the blood, transport oxygen to organs and activate white blood cells.

An Optimal Investigation of Convective Fluid Flow Suspended by Carbon Nanotubes and Thermal Radiation Impact

Abstract: This study is focused towards analyzing the heat and flow movement among two stretching rotating disks inside water-based carbon nanotubes. The idea of thermal boundary conditions and heat convection is used and the system is expressed in partial differential equations. Using the similarity techniques, the model is successfully converted to a nonlinear ordinary differential equation. A familiar collocation method is used to simulate the outcomes of the governed system while the method is validated through a set of tables and assessed with existing literature. The physical aspects of the proposed model have been studied in detail and assisted via graphical diagrams against the variation of different parameters. It is found that the multiple-wall carbon nanotubes intensify the system quickly and improve the rate of heat transmission. It is also noted that the proposed method is in excellent in agreement with already published studies and can be extended for other physical problems. Moreover, when values of Re parameter increase, a drop is noted in the magnitude of radial velocity near the faces of the disks. It is very clear from the tabular comparison that collocation scheme is in good agreement with already published studies and homotopic solutions.

Heat and mass transfer analysis of radiative and chemical reactive effects on MHD nanofluid over an infinite moving vertical plate

Abstract: A comparative study of nanofluid (Cu–H2O) and pure fluid (water) is investigated over a moving upright plate surrounded by a porous surface. The novelty of the study includes the unsteady laminar MHD natural transmission flow of an incompressible fluid, to get thermal conductivity of nanofluid is more than pure fluid. The chemical reaction of this nanofluid with respect to radiation absorption is observed by considering the nanoparticles to attain thermal equilibrium. The present work is validated with the previously published work. The upright plate travels with a constant velocity u0, and the temperature and concentration are considered to be period harmonically independent with a constant mean at the plate. The most excellent appropriate solution to the oscillatory pattern of boundary layer equations for the governing flow is computed utilizing the Perturbation Technique. The impacts of factors on velocity, temperature, and concentration are visually depicted and thoroughly elucidated. The fluid features in the boundary layer regime are explored visually and qualitatively. This enhancement is notably significant for copper nanoparticles.

Heat transfer in micropolar hybrid nanofluid flow past a vertical plate in the presence of thermal radiation and suction/injection effects

Abstract: Hybrid nanofluid are considered as advanced nanofluid, as shown by their thermal properties and budding benefits that aid the drive of increasing the heat transfer rate. This article deals with the MHD natural convective flow of micropolar CuO-Ag/water hybrid nanofluid over a plate placed vertically in a porous medium with the involvement of the suction/injection at the surface of the plate, heat generation/absorption, Joule heating, viscous dissipation, and thermal radiation influence. The similarity transformations are used to translate the fundamental controlling PDEs to ODEs. After that, nonlinear ODEs are solved by means of the R−K−F 4–5th order method and shooting technique. The comparison between the behavior of solution profiles of temperature, micro-rotation and velocity distribution for suction and injection has been visualized graphically. The effect of different shape factors on the solution profiles is also discussed. The influence of the relevant flow parameters on the heat transfer and skin friction factor are also studied. The main observation is that the heat flow rate is higher with the injection effect than with the suction effect.

Flow of hybrid CNTs past a rotating sphere subjected to thermal radiation and thermophoretic particle deposition

Abstract: Thermal radiation and thermophoretic particle deposition have important applications in research and engineering. These two principles are employed in practical applications such as electrical fuel, projectiles, thermal transportation, renewable energy, nuclear power plants, gas turbines, and aerospace engineering. In light of the aforementioned applications, the current study investigates the stagnation point hybrid CNTs movement around a rotating sphere in the existence of thermal radiation and thermophoretic particle deposition. Using appropriate similarity factors, nonlinear governing equations are converted into ordinary differential equations. The Runge Kutta Fehlberg 45 (RKF-45) order and a shooting approach are used to find the numerical results of the simplified equations and boundary conditions. The numerical findings are presented graphically. It is explored how different limitations impact their individual profiles. According to the research, primary velocity increases with acceleration parameter but decreases with secondary velocity. As the radiation parameter value increases, so does the thermal distribution. Concentration decreases as both the Schmidt number and the thermophoretic parameter decrease. The heat dispersion rate heightens as the percentage of volume fraction of solid and the radiation parameter increase. Mano CNTs have a higher primary velocity than hybrid CNTs.

Thermal improvement in magnetized nanofluid for multiple shapes nanoparticles over radiative rotating disk

Abstract: In the present time, thermal transportation in the colloidal suspensions under various scenario becomes an influential research direction due to their extensive applications. Therefore, investigation of thermal transport over a rotating disk under the impacts of thermal and velocity slip, imposed Lorentz forces and thermal radiation is conducted for multiple shape effects of the nanomaterial. The nanofluid model suspended by Al2O3, TiO2 and Cu nanomaterial is reduced in dimensionless version via similarity variables. After that, RK scheme is implemented and handle the model effectively. The outcomes of various parameters for the velocity, thermal transport, skin friction and local heat transport are sketched and explained broadly. It is examined that the heat transport for the nanofluids becomes dominant throughout the analysis in comparison with conventional liquid. The temperature of the nanofluids significantly enhances due to the velocity slip effects. Moreover, thermal radiation and the volumetric fraction of the nanomaterials favor the local heat transfer rate.

MHD mixed convection flow of a hybrid nanofluid past a permeable vertical flat plate with thermal radiation effect

Abstract: The magnetohydrodynamic (MHD) radiative flow of a hybrid alumina-copper/water nanofluid past a permeable vertical plate with mixed convection is the focal interest in this present work. Dissimilar to the traditional nanofluid model that considers only one type of nanoparticles, we consider the hybridization of two types of nanoparticles in this work which are alumina and copper. The governing flow and heat transfer equations are simplified to the ordinary differential equations (ODEs) with the adaptation of conventional similarity transformations which are then evaluated by the bvp4c solver (MATLAB) to generate the numerical solutions. The solutions are generated and illustrated in the form of graph to be easily observed. Although dual solutions are obtained in this study, only one solution is determined to be stable. By reducing the concentration volume of copper and increasing the magnetic and radiation parameters, the boundary layer separation can be hindered. With the occurrence of opposing flow due to the mixed convection parameter, the heat transfer can be enhanced when the concentration volume of copper is being reduced and when the magnetic and radiation parameters are being proliferated.

Thermal improvement in magnetized nanofluid for multiple shapes nanoparticles over radiative rotating disk

Abstract: In the present time, thermal transportation in the colloidal suspensions under various scenario becomes an influential research direction due to their extensive applications. Therefore, investigation of thermal transport over a rotating disk under the impacts of thermal and velocity slip, imposed Lorentz forces and thermal radiation is conducted for multiple shape effects of the nanomaterial. The nanofluid model suspended by Al2O3, TiO2 and Cu nanomaterial is reduced in dimensionless version via similarity variables. After that, RK scheme is implemented and handle the model effectively. The outcomes of various parameters for the velocity, thermal transport, skin friction and local heat transport are sketched and explained broadly. It is examined that the heat transport for the nanofluids becomes dominant throughout the analysis in comparison with conventional liquid. The temperature of the nanofluids significantly enhances due to the velocity slip effects. Moreover, thermal radiation and the volumetric fraction of the nanomaterials favor the local heat transfer rate.

Thermal prospective of Casson nano-materials in radiative binary reactive flow near oblique stagnation point flow with activation energy applications

Abstract: The flow of nanoparticles presents many dynamic applications in thermal sciences, solar systems, cooling and heating phenomenon, energy resources and much other multidisciplinary significance. Following to such valuable applications and motivations in mind, this research pronounced the thermal applications of radiative Casson nanoparticles in presence of radiative phenomenon and activation energy. The oblique stagnation point flow has been considered due to the stretching cylinder. To analyze the flow problem, the problem is formulated in the cylindrical coordinates. The numerical solution is computed via bvp4c built solver by using the MATLAB software. The impact of different involved parameters on skin fraction, heat transfer rate and mass transfer rate is reported and discussed in tables.

Numerical thermal featuring in γAl2O3-C2H6O2 nanofluid under the influence of thermal radiation and convective heat condition by inducing novel effects of effective Prandtl number model (EPNM)

Abstract: The investigation of thermal transport in the nanofluid attained much interest of the researchers due to their extensive applications in automobile, mechanical engineering, radiators, aerodynamics, and many other industries. Therefore, a nanofluid model is developed for γAl2O3-C2H6O2 by incorporating the novel effects of Effective Prandtl Number Model (EPNM), thermal radiations, and convective heat condition. The model discussed numerically and furnished the results against the governing flow quantities. It is examined that the nanofluid velocity alters significantly due to combined convection and stretching parameter. Induction of thermal radiation in the model significantly contributed in the temperature of nanofluids and high temperature is observed by strengthen thermal radiation (Rd) parameter. Further, convection from the surface (convective heat condition) provided extra energy to the fluid particles which boosts the temperature of γAl2O3-C2H6O2. The comparison of nanofluid (γAl2O3-C2H6O2) temperature with base fluid (C2H6O2) revealed that γAl2O3-C2H6O2 has high temperature and would be fruitful for future industrial applications. Moreover, the study is validated with previously reported literature and found reliability of the study.

Color-preserving passive radiative cooling for an actively temperature-regulated enclosure

Abstract: Active temperature control devices are widely used for the thermal management of enclosures, including vehicles and buildings. Passive radiative cooling has been extensively studied; however, its integration with existing actively temperature regulated and decorative enclosures has slipped out of the research at status quo. Here, we present a photonic-engineered dual-side thermal management strategy for reducing the active power consumption of the existing temperature-regulated enclosure without sacrificing its aesthetics. By coating the exterior and interior of the enclosure roof with two visible-transparent films with distinctive wavelength-selectivity, simultaneous control over the energy exchange among the enclosure with the hot sun, the cold outer space, the atmosphere, and the active cooler can be implemented. A power-saving of up to 63% for active coolers of the enclosure is experimentally demonstrated by measuring the heat flux compared to the ordinary enclosure when the set temperature is around 26°C. This photonic-engineered dual-side thermal management strategy offers facile integration with the existing enclosures and represents a new paradigm toward carbon neutrality.

Spectral Simulation On the Flow Patterns and Thermal Control of Radiative Nanofluid Spraying On an Inclined Revolving Disk Considering the Effect of Nanoparticle Diameter and Solid-Liquid Interfacial Layer

Abstract: The current work enlightens the flow pattern and thermal scenario of nanofluid spraying on an inclined permeable rotating disk. The whirling disk is assumed to revolve with angular speed . The water-based alumina (Al2O3) nanofluid is considered as a functioning liquid. The nanofluid spraying is treated to be magnetically influenced and as well as thermally radiative. The perception of the nanoparticle diameter and solid-liquid interfacial layer is incorporated precisely at the nanolevel to observe the thermal variations of the nanofluidic motion. How the magnetic effect, permeability, and nanolayer affect the nanofluidic transportation is revealed in detail. The leading flow equations are altered nondimensional using apposite similarity translation and spectral quasi linearization method (SQLM) is instigated to tackle those multi-ordered nonlinear equations. Various three-dimensional figures, graphs, tables are described to detect and analyze the hydrothermal variations. The linear regression slope technique is addressed to extract the reduction or enhancement rate of heat transference. Also, the probable error is estimated statistically to assure that hydrothermal characteristic is correlated with physical parameters. The consequences indicate enhanced heat transport for nanolayer, but reduced heat transmission for nanoparticles' diameter. Thermal profile intensifies for thickness parameter and impermeable surface, whereas decreases for nanoparticles' diameter.

A novel spectral relaxation approach for nanofluid flow past a stretching surface in presence of magnetic field and nonlinear radiation

Abstract: The goal of current research is to peruse the influences of magnetic field and nonlinear radiation on stagnation-point flow of nanofluid past a stretching surface. The Joule heating and viscous dissipation properties are considered for analysis in present work. The spectral relaxation numerical approach is implemented to solve the principal equations of the problem. Also, the influences of nanoparticles thermophoretic diffusion and Brownian motion, as well as Prandtl, Eckert, Lewis, and Biot numbers are analyzed and discussed in details. As a main result, it can be concluded that by increasing Prandtl number the temperature profile reduces for different values of radiation parameter. Furthermore, the results show that the nanofluid temperature profile rises with increase of Lewis number. In addition, the findings reveal that increasing the strength of the magnetic field affects the temperature and concentration of nanofluid.

Influence of radiation and viscous dissipation on MHD heat transfer Casson nanofluid flow along a nonlinear stretching surface with chemical reaction

Abstract: The present article investigates the influence of Joule heating and chemical reaction on magneto Casson nanofluid phenomena in the occurrence of thermal radiation through a porous inclined stretching sheet. Consideration is extended to heat absorption/generation and viscous dissipation. The governing partial differential equations were transformed into nonlinear ordinary differential equations and numerically solved using the Implicit Finite Difference technique. The article analyses the effect of various physical flow parameters on velocity, heat, and mass transfer distributions. For the various involved parameters, the graphical and numerical outcomes are established. The analysis reveals that the enhancement of the radiation parameter increases the temperature and the chemical reaction parameter decreases the concentration profile. The empirical data presented were compared with previously published findings.

Impact of magnetized radiative flow of sutterby nanofluid subjected to convectively heated wedge

Abstract: In the recent years, nanotechnologies have been widely used in several fields regarding their rapid developments which creates a lot of prospects for researchers and engineers. More specifically, replacement of conventional liquids with nanoliquids is considered as an innovative solution to heat transfer problems. Keeping the aforesaid pragmatism of nanofluid in view, we have considered a time-dependent mathematical model to formulate the heat sink–source-based Sutterby liquid under thermophoretic and Brownian movements with wedge geometry. Additionally, convective condition, heat sink/source and chemical reaction properties are considered. Appropriate similarity transformations are used to obtain ordinary differential equations (ODEs) from the corresponding PDEs. Furthermore, coupled ODEs are tackled numerically by technique bvp4c in MATLAB. Discussion for thermal and concentration distribution is also presented graphically. Moreover, the temperature field enhance for Brownian parameter and decays for concentration field in this study. A similar impact has been examined for unsteadiness and chemical reaction parameters on concentration plot. Thermal distribution declines for boosted Prandtl number.