Fluid Flow Mass Transfer Research Articles

Numerical Study in Effect of Thermal Slip on Two Fluid Flow in a Vertical Channel

The present study investigates the effect of thermal slip on an immiscible flow of micropolar and viscous fluids in a vertical channel. The left boundary is subjected to thermal slip with appropriate boundary and interface conditions, resulting in a linked system of nonlinear partial differential equations. The ND Solve technique in Mathematica software is used to implement the Runge-Kutta method of the sixth order. The velocity, temperature, and concentration equations are then calculated. The mass, heat, and velocity transmission rates at the boundaries were recorded for all the variations in the governing parameters. In addition, the impact of relevant parameters on various physical properties of micropolar and viscous fluids is analyzed through graphical means. The results are then discussed in detail. Thermal slip, Grashof number, molecular number, magnetic parameter, and Reynolds number are crucial factors that significantly affect heat and mass transfer in fluid flow. The effect of the increased thermal slip is noted to result in a decrease in both the velocity profile and temperature. It was also observed that higher values of Grashof and molecular Grashof numbers led to increased velocity and angular velocity.

A Comparative Numerical Study of Heat and Mass Transfer Individualities in Casson Stagnation Point Fluid Flow Past a Flat and Cylindrical Surfaces

There is a consensus among researchers that the simultaneous involvement of heat and mass transfer in fluid flow owns numerous daily life applications like energy systems, automobiles, cooling of electronic devices, power generation by the stream, electric power, and diagnosing and characterizing diseases, to mention just a few. Owing to such motivation, we considered both heat and mass transfer aspects in non-Newtonian fluid flow regimes. The Casson fluid is considered as a non-Newtonian fluid. For better novelty the flow is considered at both flat and cylindrical surfaces along with stagnation point, magnetic field, mixed convection, heat generation, viscous dissipation, thermal radiations, and temperature-dependent thermal conductivity. The ultimate differential equations are nonlinear, and hence difficult to solve analytically. Therefore, a numerical scheme, namely the shooting method with the Runge–Kutta algorithm, is adopted to report an acceptable solution for flow field description. The outcomes are shared comparatively for flat and cylindrical surfaces. We have seen that compared to a flat surface, the cylindrical surface has a larger Nusselt number magnitude.

Hybrid nanofluid flow past a stretching/shrinking sheet with thermal radiation and mass transpiration

In this article, an exact analytical solution of a hybrid nanofluid (HNF) flow over a stretching/shrinking sheet in the presence of mass transpiration (suction/injection) and radiation is investigated. The governing PDEs are first transformed into ODEs with the help of similarity variables. Further, an exact analytical solution of this problem, including a general formulation of the stretching/shrinking sheet problems, is established. HNFs have a significant feature in increasing the heat transfer process and promoting the production in industrial applications. The analysis demonstrated that the upper branch of the analytical solution procedure is stable, although unstable for the lower branch. Momentum and impact of thermal radiation and heat generation on the flow of an incompressible HNF over a stretching/shrinking sheet with mass transfer in fluid flow have been considered. Al2O3 and Cu nanoparticles are immersed in H2O to form an Al2O3 – Cu/H2O HNF. The thermal radiation is also considered in this analysis. Additionally, the rate of heat transfer of the HNF is lower than that of the base fluid (water). We also observe the interesting phenomena of exponentially and algebraically decaying solutions. After neglecting the viscous dissipation term, the heat equation is solved analytically and the effect of various parameters are discussed with the help of graphs. The present problem contains numerous applications in industrial processes namely paper production, metal spinning, extrusion of polymer etc.

Mass transfer in fluid flow from a solid sphere

The general problem of mass transfer from a solid spherical surface in a fluid is discussed following consideration of the flow patterns around a sphere and actual dissolution of solid spheres in a controlled stream of water. Experimental mass-transfer data for the dissolution of 0∙5 in. benzoic acid spheres in a stream of water at room temperature are correlated by the equation Kd / D = 44 + 0∙48 R 0∙5 S 0∙33 , where K is the mass-transfer film coefficient, d the sphere diameter and D the diffusivity. From a consideration of mass transfer by natural and forced convection, the following general equation is proposed for the mass transfer from solid spheres in a fluid: Kd / D = 0∙50 (G' S) 0∙25 + 0∙48 R 0∙5 S 0∙33 for G' S ⊀ 10 5 .