The induced flow effect is the rotary motion generated in the fluid flow due to the temperature gradient. The phenomenon of Thermophoresis is the movement of particles from the warmer side of the fluid to the cooler side. Laser is a very suitable device for creating a temperature gradient due to its unique features such as high power density, harmonic waves, single wavelength and very low divergence. Thermophoresis phenomenon and induced flow have many uses in the transfer of particles and in various fields such as medicine and industry. In the present work, the phenomena of laser thermal interactions and flows of microparticles were studied. Thermophoresis phenomenon and induced flow were investigated experimentally using laser. Scale analysis of the migration velocity caused by the laser thermal effects shows that the induced flow in the fluid has a larger scale in comparison with the Thermophoresis phenomenon. Thus, the focus of the experimental study was on the laser induced flow by the local heat absorption of Rhodamine B solutions. Review of recent researches show that the idea of Rhodamine B topical absorption to create fluid motion has not been previously published. Therefore, it is considered as the most important novelty of the present work.

The effects of heat and mass transfer on two-dimensional magnetohydro-dynamic (MHD) flow of Maxwell fluid over a stretching surface are discussed. The stretching surface satisfies the convective boundary conditions. In addition, the analysis has been carried out in the presence of Joule heating, thermal radiation and Thermophoresis. Governing partial differential equations are first reduced into ordinary differential equations and then computed for series solutions. Numerical values of local Nusselt and Sherwood numbers are presented and examined.

The two thermal effects, Thermophoresis and photophoresis phenomena that cause particle movements due to thermal gradient through the liquid and thermal gradient through the particle, respectively, have been widely studied over the past years because of their wide range of applications. This thermal gradient can be made by laser beam. There are a few studies concerning these two effects, especially photophoresis, in liquid media. In this paper, these two effects and their induced velocity to particles are studied in liquid media. The affecting parameters on these effects are studied and their effect on particles are determined. Effect of laser parameters like laser power and wavelength in the channel are discussed and the maximum velocity and temperature inside the channel are calculated. Also in the photophoresis part, the effect of parameters like laser power, particle and laser beam diameter is calculated. By considering the existing models for calculation of thermophoretic velocity, Brenner model is chosen as the most accurate model and will be used in calculations. It is also found that the effect of laser wavelength on thermophoretic velocity is more than changing laser power. In the photophoresis part, photophoretic velocity is calculated by using existing analytical models. The calculated velocities of Thermophoresis and photophoresis are compared with the experimental values and there is an acceptable matching between them. The results of this paper will be used for designing and making a particle separator tool.

Introduction: Molecular interactions play an important role in the phenomenon and biological processes. In fact, any cellular biological process ranged from genetic replication to the production of various proteins to the transmission of neurological, hormonal, membrane involves collections of molecular interactions that occur continuously. Interference in each of these processes at every s tage of molecular interaction may be caused by various diseases. Therefore, their careful s tudy can improve our unders tand of biological phenomena and lead to the emergence of new methods for the treatment of many diseases, in particular, the diseases of the nervous sys tem. For this purpose, various biophysical and biochemical methods have been developed. Among them, infrared laser-based methods are very useful and important. Thermophoresis is one of these methods, which has been considered in recent years by medical, pharmaceutical, neuroscience, regeneration and biology scientis ts. This method is based on the direct movement of molecules in a temperature slope. This type of movement greatly depends on the biophysical properties of the molecule, including size, load, and solvent layer. Micro-scale modifications in this specification can affect the properties of the molecule under the influence of temperature. Conclusion: Thermophoresis is an easy, accurate, and fas t method for analyzing the behavior of molecules. For this purpose, in the present s tudy, we discussed the various theoretical and practical details as well as the various advantages and disadvantages of measuring the tendency of small molecules, such as ions and biochemical molecules.

A study based on the theoretical investigation of Thermophoresis and Brownian motion effects on radiative heat transfer in the neighborhood of stagnation point. Thermophoresis and Brownian motion play an important role in thermal and mass concentration analyses. These analyses help to comprehend the core ideas to carry out in the discipline of science and technology. An electrically conducting nanofluid is considered which is described by the Buongiorno transport model. The power-law form of the stretching wall velocity allows the similarity solution, the transformed system of the ordinary differential equations is computed numerically with the efficient rapid convergent spectral scheme. The obtained results for velocity, temperature, concentration, shear strain, mass and heat transfer rates are presented graphically for various values of the pertinent parameters. The outcomes divulge that with the increase of power-law exponent, mass and heat transfer rates enhance. The information for the volume and high-temperature transfer rate is provided in the form of Tables. The obtained results are matched with the existing results and are shown to be a good agreement.

The effect of chemical reaction, radiation on heat and mass transfer along a continuously moving surface in presence of Thermophoresis has been discussed. The fluid viscosity is assumed as an inverse linear function of temperature. The system of non-linear partial differential equations developed in the process have finally transformed into a set of ordinary differential equations with the help of similarity transformation and then solved numerically using Runga- Kutta method with shooting technique. The results showing the effect of physical parameters on velocity, temperature and concentration have been computed and presented graphically to discuss them in detail. It has been observed that temperature increases with an increase in radiation parameter. Also, it is seen that the concentration decreases with the increase in chemical reaction parameter and Schmidt number.

This study analyses the combined effect of chemical reaction and Soret number on MHD flow of a viscous and incompressible fluid near the exponentially accelerated infinite vertical plate in a rotating system. The fluid under consideration is electrically conducting and the medium is porous. A set of dimensionless governing equations of the model is obtained. As the equations are linear, an exact solution is derived by using Laplace technique. The effects of flow parameters on the concentration, temperature and velocity are discussed through graphs. It is noticed that the components of the velocity in both the directions can be increased by increasing the Soret number; and the velocities can be reduced by increasing the chemical reaction parameter. Tables depict the numerical values of the rate of change of momentum, concentration and temperature. Applications of the study are considered in the fields like solar plasma and planetary fluid dynamics systems, rotating MHD generators, etc.