Increasing Grashof Number Research Articles

Численное исследование естественной конвекции в кольцевом канале с подвижным внутренним цилиндром

This paper presents a numerical study of the natural convection of a viscous incompressible fluid that completely fills a horizontal annular channel. The temperature difference at the outer boundary produces convection, which can cause the rotation of the inner cylinder around its axis. The cylinder is assumed to rotate without friction. The Boussinesq approximation is used as a mathematical model. The problem is solved numerically by the algorithm SIMPLER. The equation of motion of the inner cylinder is derived from the law of conservation of angular momentum. The choice of a numerical integration method for the equation of motion of the inner cylinder does not affect the result. The influence of the dimensionless parameters on the flow structure and the angular velocity of the inner cylinder was studied. Dimensionless parameters vary within the ranges: Grashof number 103...2·105, Prandtl number 0.5...15, the dimensionless thermal conductivity of the cylinder 0...∞, and the cylinder inner radius 0.05...0.9. Numerical simulations have shown that the flow structure affects the angular velocity of the inner cylinder, which reaches its maximum in the case of a single-cell flow and at a minimum internal radius. As the Grashof number increases, the maximum possible angular velocity of the inner cylinder increases monotonically and is realized at large inner radius values. The Prandtl number has an opposite effect on the cylinder rotation velocity. If it decreases, then the angular velocity becomes extremely high at smaller inner radius values. An increase in the dimensionless thermal conductivity leads to the growth of the angular velocity, but it reaches a maximum at a smaller inner radius. The influence of the considered parameters on the angular velocity is determined by the change in the structure of the flow in the annular channel. The research results may be useful in the development of technical devices with an annular channel and a rotating inner cylinder.

Investigation of drafting-kissing-tumbling movement of two particles with conjugate heat transfer

The conjugate heat transfer at the particle-fluid interface and the collision between particles play a crucial role in the sedimentation process of particles. In this work, the recent volumetric lattice Boltzmann method for thermal particulate flows with conjugate heat transfer is adopted to investigate the drafting-kissing-tumbling movement in the sedimentation process of two particles in a closed channel. This volumetric lattice Boltzmann method is based on double distribution functions, with the density distribution function used for the velocity field and the internal energy distribution function used for the temperature field. It is a single-domain approach, and the nonslip velocity condition within the solid domain can be strictly ensured. The difference in thermophysical properties between the solid and fluid can be correctly handled, and the conjugate heat transfer condition can be automatically achieved without any additional treatments. Based on this particle-resolved simulation, the influences of the solid-to-fluid specific heat ratio, the Grashof number, and the particle’s initial temperature on the drafting-kissing-tumbling movement are discussed in detail. It is found that the fluid cooled by the particle and thus subjected to the downward buoyancy force can promote particle sedimentation. As the specific heat ratio increases, the particle’s temperature rises relatively slowly. In the sedimentation of two cold particles, the drafting duration and tumbling duration of the drafting-kissing-tumbling movement decrease when the heat capacity ratio increases. In contrast, the kissing duration increases as the heat capacity ratio increases. When the Grashof number increases, the heat transfer between the particle and fluid is enhanced, and the drafting duration significantly decreases while the kissing duration and tumbling duration remain almost unchanged in the sedimentation of two cold particles. The particle’s initial temperature greatly affects the occurrence moment of the drafting-kissing-tumbling movement. To be specific, the drafting-kissing-tumbling movement occurs at the earliest moment for the sedimentation of two cold particles, followed by the sedimentation of one cold and one hot particle, and the latest for the sedimentation of two hot particles. The promoting effect of the low particle’s initial temperature on the drafting-kissing-tumbling movement mainly takes place in the dragging stage and kissing stage. The particle’s initial temperature has almost no influence on the tumbling duration.

Thermal and solutal performance analysis featuring fully developed chemically reacting micro-rotational convective flow in an open-ended vertical channel

The effects of a baffle and chemical reaction (first-order) on liquid flow in an upright double-passage channel were studied using regular perturbation analysis. Each of the two streams has its pressure gradient, temperature and velocity, and the channel is partitioned into two channels by a thin baffle that is fully conductive and flat in shape. The coupled nonlinear ordinary differential equations are solved using appropriate boundary constraints. The analytical results are plotted for various important parameters and exhibited graphically relevant to the flow field at all baffles. Results reveal that the enhancement in the small perturbation parameter upsurges the temperature in both regions. The velocity, thermal and micro rotational fields increase with the increase in thermal and mass Grashof number. Here, an upsurge in Grashof numbers increases the buoyancy force, resulting in an upsurge in the velocity, temperature, and micro rotational fields. The micro rotational velocity falls in area I but increases in region II at various baffle positions as the ratio of Grashof number to Reynolds number rises. Results obtained for few more parameters such as material parameter suppress the flow because of microporous property and brinkman number which is considered as perturbation parameter it enhances the flow which is helps a lot for practical situations in engineering field. Analytical and numerical results hold good with each other in this work.

Numerical Simulation of the Melting of Solid Particles in Thermal Convection with a Modified Immersed Boundary Method

A new immersed boundary method is proposed for the numerical simulation of the melting of solid particles in its own liquid at a high temperature. The main feature of the new method is the use of the modified direct-forcing immersed boundary method for the solution of the flow field and the sharp-interface immersed boundary method for the temperature field. The accuracy of the proposed method is validated via three problems: the sedimentation of a non-melting particle, the melting of a fixed particle under mixed thermal convection, and the sedimentation of a melting particle. The method is then applied to the investigation of the effects of various parameters, the particle interactions and the particle shape on the particle melting time. A correlation for the melting time of a circular particle in forced thermal convection is established as a function of the Reynolds, Prandtl, and Stefan numbers. The melting time of a particle in mixed thermal convection first increases and then decreases, as the Grashof number increases. The effects of the particle interactions on the melting time are complicated due to the natural convection between two particles. The sufficiently strong natural convection can even render the downstream particle melt faster than the single particle. For the same particle area, the elliptic particle with the aspect ratio being around 1.4 melts most slowly.

Entropy optimization on Casson nanofluid flow with radiation and Arrhenius activation energy over different geometries: A numerical and statistical approach

This study employs numerical and statistical approaches to investigate the entropy optimization of steady Casson nanofluid flow over three different geometries subject to boundary conditions induced by convective flow. Multiple linear regression is employed to statistically examine. The present model incorporates several novel elements, such as Arrhenius activation energy, Brownian motion, the Cattaneo-Christov dual flux, thermophoresis, thermal radiation, and so on. Moreover, a comparison is presented between Newtonian and non-Newtonian fluids. By applying the proper similarity transformations, ordinary differential equations (ODEs) are obtained by converting foundational partial differential equations (PDEs). The Runge-Kutta fourth-order method is utilised to solve the obtained ODEs along with the shooting technique. The outcomes are visually depicted via tables and graphs. The velocity drops with increasing Grashof number, and the magnetic field becomes progressively more forceful as the suction parameter increases. The temperature gets reduced with the increase of the suction parameter, solute Grashof number increases with the magnetic field, thermophoresis, and radiation parameters. The entropy is observed to rise with the increase of the effective parameters (magnetic field, Brinkmann number and radiation). The MAD (mean absolute deviation), MSE (mean squared error), and RMSE (root mean square error) values are approaching zero, indicating that the derived outcomes are highly accurate. A lower MAPE (mean absolute percentage error) suggests that the model has a higher level of precision. Therefore, the outcomes of the present model are more precise and reliable. This study has various potential applications such as power plant heat exchangers, material processing industries, and solar thermal energy systems.

Hydromagnetic Turbulent Flow in Porous Media Over a Stretching Surface in a Rotating System with Heat

This study investigates the combined effects of magnetic fields, buoyancy forces, porosity, rotation, and Joule’s heating on fluid flow and heat transfer dynamics. The analysis is performed using a numerical approach, with the system oriented along three axes: the z-axis aligned with the plate, the y-axis perpendicular to the plate, and the x-axis orthogonal to the y-z plane. An infinite plate extends along the x and z axes, with a uniform transverse magnetic field applied parallel to the y-axis. By employing the finite difference method in MATLAB, we explore how various dimensionless parameters influence temperature and velocity profiles. Our findings reveal that an increase in the local temperature Grashof number enhances primary velocity while reducing secondary velocity near the fixed end. Temperature profiles show a decrease near the plate, increasing further away. The study also highlights that a higher Joule heating parameter leads to elevated primary velocity and temperature profiles but diminishes secondary velocity. Additionally, increasing rotational parameters is observed to decrease both primary and secondary velocities while augmenting temperature profiles near the plate. These results underscore the significant role that magnetic fields, rotational effects, and Joule heating play in modulating fluid flow and thermal behavior. The insights gained from this study can inform the design and optimization of engineering systems where control of velocity and temperature profiles is critical.

Mathematical Modelling of the Thermosolutal Effect on Blood Flow through a Micro-Channel in the Presence of a Magnetic Field

Substances such as mass concentrations in the blood cause circulation challenges. Blood is a substance made up of 55% plasma and 45% hemoglobin, which flows through the blood vessels and is aided by the heart in pumping to all organs and other tissues and cells in the human body. Mathematical modelling plays an important role in understanding the blood circulation problem in the human body, and it helps transform the real-life cardiovascular problem into a system of mathematical equations. In this research, we transformed the real-life cardiovascular problem of the heat effect on mass concentration and blood flow through blood vessels into a system of partial differential equations representing blood momentum, energy, and mass concentration equations after modifying the Navier-Stoke equation. The models are scaled from dimensional to dimensionless using specific scaling parameters. The scaled dimensionless equations were further perturbed and reduced to a system of ordinary differential equations, and the system of ODEs was solved using the Laplace method, where mathematical models representing blood velocity profiles, temperature profiles, and mass concentration profiles were obtained. A numerical simulation was performed using Wolfram Mathematica, version 12, where the effect of the pertinent parameters on the flow profiles was investigated and the results were presented graphically. The variation of the pertinent parameters such as the Grashof number, solutal Grashof number, Prandtl number, Soret number, Schmidt number, Darcy number, and magnetic field affect the flow profile such that the increase in Grashof number and solutal Grashof number causes the blood velocity to increase substantially at the centre of the vessel before decreasing to zero as the wall boundary layer increases, while the increase in Prandtl number and Soret number increases the blood temperature and velocity.

An investigation of the heat and mass transfer effects in vertical channels with immersible fluid flow through a porous matrix

AbstractIn this article, we investigated the heat and mass transfer of immiscible fluid flow in symmetric two‐vertical regions with a porous matrix in region‐II. The properties of heat generation and absorption are discussed. The channel, consisting of two vertical regions, is filled with a porous matrix with viscous fluids. In both cases, we considered the fluids that undergo Newtonian heat generation and absorption. It was assumed that the porous matrix's channel wall was thermally stable and electrically non‐conducting. The analytical method is used to solve governing equations. Variations in Brinkman Number (Br), Biot Number (Bi), Grashof (Gr) number, viscosity ratio (m), heat generation, and thermal conductivity are illustrated graphically. And we examined the increase in Grashof number, which has effects on fluid flows in both regions. Similarly, the change of heat and momentum transmission in porous media is greatly affected by the viscosity, channel width, source, and sink. Also, when the Grashof number increases, buoyancy increases, leading to an increase in the fluid flow for heat generation and absorption.

Effect of Thermal Radiation on Fractional MHD Casson Flow with the Help of Fractional Operator

This study examines the effects of Newtonian heating along with heat generation, and thermal radiation on magnetohydrodynamic Casson fluid over a vertical plate. At the boundary, the Newtonian heating phenomena has been employed. The problem is split into two sections for this reason: momentum equation and energy equations. To transform the equations of the given model into dimensionless equations, some particular dimensionless parameters are defined. In this article, generalized Fourier’s law and the recently proposed Caputo Fabrizio fractional operator are applied. The corresponding results of non-dimensional velocity and heat equations can be identified through the application of Laplace transform. Moreover, Tzou’s algorithm as well as Stehfest’s algorithm is implemented to recognize the inverted Laplace transform of heat and momentum equations. Finally, a graphical sketch is created using Mathcad 15 software to demonstrate the results of numerous physical characteristics. It has been reported that the heat and velocity drop with rising Prandtl number values, whereas the fluid’s velocity has been seen to rise with increasing Grashof number values. Additionally, current research has shown that flow velocity and temperature increase with rising values of a fractional parameter.

A novel investigation of Casson fluid flow over an infinite plate with constant temperature by constructing the absorbing boundary conditions

Casson fluid has been widely used in blood, honey, chocolate, and various polymer fluids, for which the investigation of its underlying flow and heat transfer mechanisms in complex environments is of vital significance. In this paper, the Casson fluid flow over an infinite moving plate with constant temperature is studied, which leads to a coupled system of the velocity and temperature fields. To treat the infinite coupled system more accurately, the artificial boundary conditions in terms of fractional derivatives are developed using the Laplace transform, which transfers the problem in the infinite domain to a model in the bounded domain. The finite difference method is applied to solve the new bounded coupled system. Furthermore, three numerical experiments are presented to demonstrate the validity and accuracy of the transferred model and the numerical scheme. The influence of some important physical parameters on the velocity and temperature fields is also explored. The main findings are that the viscosity of the Casson fluid decreases with an increasing Grashof number leading to an accelerated flow, the thermal conductivity diminishes as the Prandtl number increases resulting in a weakened thermal effect within the flow, and the velocity at the fixed position decreases as the Casson parameter increases.

A study on peristaltic flow and nanofluid in medication delivery systems considering heat transfer

This study uses analytical and numerical approaches to explore nanofluid peristaltic flow and heat transfer in drug delivery systems. Low Reynolds numbers are used to examine the study using long-wavelength approximations. Along the channel, the walls are distributed sinusoidally. The current issue is resolved by using analytical and numerical methods, and solutions are obtained for the temperature profile, axial velocity, volume flow rate, pressure gradient, stream function, and Nusselt number. The influence of several physical factors on the temperature, velocity profile, and trapping phenomena is shown. These parameters include the thermal and basic-density Grashof numbers and the Brownian motion and thermophoresis parameters. Along the channel, streamlines and Nusselt number variations are also displayed. The axial velocity profile is shown to be greatly reduced when the thermal Grashof number rises, but it increases as the species Grashof number rises. Specifically, the axial velocity increased by 50% with the increase of the species Grashof number from 0.1 to 1, but the thermal Grashof decreased by 33% with the same amount of change. Compared to Newtonian fluids, nanofluids tend to reduce backflow and also exhibit a significant rise in pressure differential, indicating that they are a more practical fluid for use in medical pumps for drug delivery systems. With the increase in Brownian motion and thermophoretic parameters, the Nusselt number decreased sharply. Changing these parameters from 0.1 to 4 brought the Nusselt number to about 10% of its initial value. Also, the increase in these parameters leads to an increase in temperature and a decrease in fluid velocity.

NUMERICAL STUDY FOR A THREE DIMENSIONAL LAMINAR NATURAL CONVECTION HEAT TRANSFER FROM AN ISOTHERMAL HEATED HORIZONTAL AND INCLINED SQUARE PLATE AND WITH A CIRCULAR HOLE

A theoretical study for a three-dimensional natural convection heat transfer from an isothermal horizontal , vertical and inclined heated square flat plates (with and without circular hole) has been done in the present work. The study involved the numerical solution of the transient Navier-Stokes and energy equations by using finite deference method (F.D.M.). The complete Navier-Stokes equation are transformed and expressed in terms of vorticity-vector potential. The Energy and Vorticity equations were solved by using an Alternating Direction Implicit (ADI) method because they are transient equations of parabolic portion, and the Vector potential is solved by using an equations Successive Over-Relaxation (S.O.R) method because it is from elliptic portion. The numerical solution is capable of calculating the Vector potential, three components of Vorticity and temperature field of the calculation domain. The numerical results were obtained in rang of Grashof number (103≤Gr≤5x104 ) with Prandtl number of (0.72) for square flat plate and the other consist a circle hole with ratio 0.6 and 0.8 diameter of the hole to main square side length. The numerical results showed that the main process of heat transfer is conduction for Grashof number less than 103 and convection for Grashof number larger than 103 and the results of local Nusselt number show fairly large dependence on inclination angle. For horizontal plate facing upward and downward, average Nusselt number is proportional to one-fifth power of Rayleigh number, and there is a significant difference in heat transfer rates between the upward and downward cases. For horizontal plate with circle hole facing upward for Grashof number 104 , the effect of core portion caused a limited increment in the heat transfer rate, where as for the facing downward case, the effect was larger and the maximum value of heat transfer rates is be for square flat plate with circle hole by ratio 0.6 for all inclination angles. With the increase of Grashof number to 5x104 heat transfer rates decrease except the square horizontal flat plate with circle hole by ratio 0.6 . The average Nusselt number increases with the increase of inclination of plates facing upward to reach to the higher average Nusselt number at vertical position then decrease with increase of inclination of plates. And the maximum value of average Nusselt number is depended on the ratio of diameter of the hole to main square side length, showed that the maximum temperature gradient occurs at the external edge of the horizontal plate (with and without circle hole) facing upward and at the lower external edge in inclined case. The numerical results was made through comparison with a previous numerical and experimental work, the agreement was good.

Enhancing Magnetohydrodynamic Stability in Channel Flows through Porous Media Incorporating Darcy-Forchheimer Modifications into the Orr-Sommerfeld Analysis

This research paper investigates the stability characteristics of magnetohydrodynamic (MHD) flow within channels filled with porous media. Specifically, the study explores modifications to the classical Orr-Sommerfeld equation using the Darcy-Forchheimer model to account for the presence of porous media. The analysis aims to elucidate the combined influence of porous media and magnetic fields on flow stability in such systems. Numerical simulations and analytical techniques are employed to assess the impact of varying parameters on the stability behavior of the flow. The study revealed that the velocity profile increases with increase in Schmidt and Prandtl’s number and stabilizes with the increase in Grashof number and the buoyancy. The temperature profile increases with Reynold’s Number and Hartmann number. It stabilizes with Schmidt, Prandtl and Grashof number. The profile of species concentration stabilizes with thermo-phoretic parameter, Prandtl number and Darcy-Forchheimer’s parameter augumentation.

MHD in a Porous Medium across Parallel Plates with Mass Transfer in a Rotating System

This study investigated MHD flow in a porous medium across parallel plates with mass transfer in a rotating system. The governing equation of momentum were non-dimensionalised on velocity and concentration gradient. The resulting equations were then transformed using FD to fit some algebraic matrices solved by computer software (MATLAB). The end equations were analysed for velocity and concentration profile. The numerical data on concentration and velocity profile were recorded and presented graphically for interpretation and discussed. Some of the results revealed that velocity decreases when magnetic parameter and Grashof number increases. The knowledge obtained from this study can be applied in real life situations such as engineering and industries such as polymer processing.

Effects of Injection/Suction on Unsteady MHD Natural Convective Radiative Flow of Heat Mass Transfer in a Plumb Frequency

This paper explores the effects of injection/suction on MHD unsteady natural convective radiative flow of heat mass transfer in a plumb frequency. The governing partial differential equations are converted to non- dimensional forms and solved numerically by an efficient, implicit, iterative method of Crank Nicolson. Suction/injection is used to control the fluid flow in the channel, and an exothermic chemical reaction of Arrhenius kinetic is considered. A parametric study illustrating the influence of various physical parameters is performed. Numerical results for the velocity, temperature, ad concentration as well as the skin friction factor, surface heat and mass transfer rates have been presented for parametric variations of injection/suction, Grashof number, MHD, Prandtl number and Schmidt number. It is reported that the velocity profile increase as thermal grashof number increases. The temperature profile rises by the influence in increasing values of injection and decreases by increasing values of suction parameter. While concentration profile decreases by the increasing values of chemical reaction in the case of suction and injection. The dependence of the skin friction coefficient, rate of heat transfer and mass transfer on these parameters has been discussed.

Entropy generation on an MHD Casson fluid flow in an inclined channel with a permeable walls through Hermite wavelet method

The current work provides a theoretical investigation of permeability effects on channel walls. The entropy generation in an incompressible Casson fluid flowing through an inclined penetrable channel which is under the magnetic action is numerically investigated by transforming the governing equations into a system of ODEs using non-dimensional parameters. The Hermite wavelet method is used to solve the achieved nonlinear coupled equations. Velocity, temperature, and entropy generation profiles are analyzed graphically and in addition, graphs are employed to assess the Bejan number, Nusselt number, and skin friction coefficient for a scale of various values of physical parameters. The results are evident that for increasing the Biot number, Grashof number, and Casson parameter entropy generation increases. The entropy production is suppressed when the Eckert number is enhanced. The dual nature of entropy generation is observed due to varying magnetic values. Our findings obtained from the present method are compared with other results available in the literature and is found that it is in good correlation with the existing one.

The turbulence development of a vertical natural convection boundary layer

Results from direct numerical simulations of a vertical natural convection boundary layer (NCBL) with $Pr=0.71$ reveal that the turbulence development of such a thermally driven convective flow has two distinct stages: at relatively low Grashof number, the bulk flow is turbulent while the near-wall region is laminar-like or weakly turbulent; at sufficiently high Grashof number, the entire flow becomes turbulent in the sense of von Kármán (cf. Grossmann & Lohse, J. Fluid Mech., vol. 407, 2000, pp. 27–56, for the ultimate turbulent regime). Investigations on the turbulence statistics show that the near-wall Reynolds shear stress is negligible in the weakly turbulent regime but will grow in magnitude as the flow transitions to the ultimate regime at higher Grashof number. Similar behaviour is also seen in the streamwise turbulence intensity, where it develops from a mono-peak profile into a dual-peak structure as the Grashof number increases. At higher Grashof number, the near-wall energetic site is shown to have an energy distribution similar to that of a canonical wall-bounded turbulence (e.g. Hutchins & Marusic, Phil. Trans. R. Soc.A, vol. 365, 2007, pp. 647–664), with a peak centred at fixed location and wavelength ( $y^+=18$ and $\lambda ^+_x=1000$ ) in viscous coordinates. Investigation on the spanwise spectra also suggests that the turbulent near-wall streaks emerge only at sufficiently high Grashof number, with constant spacing $\lambda _z^+\approx 130$ . The extent of the weakly turbulent regime is identified using the maximum velocity location $\delta_m$ and a laminar length scale $\delta_u$ . The development of near-wall turbulence is also investigated by examining the turbulence kinetic energy budget. In the weakly turbulent regime, the near-wall turbulence is sustained predominantly by the pressure transport in addition to the shear production. At higher Grashof number, the flow becomes fully turbulent, and both turbulent transport and shear production become stronger, while the pressure transport is decreased. These results also reveal that the production–dissipation ratio $P/\varepsilon$ of the NCBL would follow a fundamentally different trend to the canonical wall-bounded flows, which further supports that the near-wall turbulence generation is affected by the bulk flow.

Natural Convection Heat Transfer from a Plane Wall to Thermally Stratified Environment

The effect of linear thermal stratification in stable stationary ambient fluid on free convective flow of a viscous incompressible fluid along a plane wall is numerically investigated in the present work. The governing equations of continuity, momentum and energy are solved numerically using finite difference method with Alternating Direct implicit Scheme. The velocity, temperature distributionsand the Nusselt number are discussed numerically for various values of physical parameters and presented through graphs. ANSYS program also used to solve the problem. The results show that the effect of stratification parameter is marginalized with the increase in Prandtl number, and the increase in Grashof number does not practically vary the effect of stratification parameter.

Soret and Dufour Effects on Chemically Reacting and Viscous Dissipating Nanofluid Flowing Past a Moving Porous Plate in the Presence of a Heat Source/Sink

Abstract This study performed a numerical investigation of the Soret and Dufour effects on unsteady free convective chemically reacting nanofluid flowing past a vertically moving porous plate in the presence of viscous dissipation and a heat source/sink. The equations directing the flow are non-dimensionalised, modified to ordinary differential equations and emerging equations are resolved computationally by using the bvp4c function in MATLAB software. The results obtained from this analysis indicate that the resulting velocity of the nanofluid increases with increasing Grashof number, mass Grashof number and porosity parameter. An increase in the Dufour number increases the fluid temperature, whereas the concentration profile declines with the increase in the Schmidt number. It is also observed that the skin friction coefficient, Nusselt number and Sherwood number increase with increasing magnetic field parameter, Eckert number and Schmidt number, respectively. The present study reveals the impact of Soret and Dufour effects on heat and mass transfer rates in chemically reacting and viscous dissipating nanofluids.

Unsteady Magnetohydrodynamics (MHD) Natural Convective Flow of Nanofluids Over an Infinite Perpendicular Absorbent Plate

The magnetic fields played the significant roles in plentiful field they are, biologically, chemically, mechanically as well as medically all investigations. In clinical as well as medical investigation the magnets were extremely imperative to create 3-dimensional images of anatomical as well as diagnostics significance from nuclear magnetic resonances signal. In views of those applications, the purpose of present research is to the unsteady MHD convective flow past a moving vertical porous plate in nanofluids in the presence of a uniform transverse magnetic field has been carried out. The governing equations are solved using Laplace transform technique and the solutions are presented in closed form. The numerical computations of velocity and nanofluid temperature the rate of heat transfer and the shear stress at the plate are presented graphically for several values of the pertinent parameters. An increase in radiation parameter leads to decrease the fluid velocity as well as temperature in the boundary layer region. The velocity enhances with increasing permeability parameter. An increase in Grashof number and an increase in time lead to increase the fluid temperature. The rate of heat transfer at the plate is found to be higher for Cu-water nanofluid. The shear stress at the plate for Cu-water nanofluid is found to be lower. The present study has many applications in engineering devices.