المؤلفون: Joaquín Zueco, Verónica Rubio Hernández

المصدر: International Journal of Heat and Mass Transfer. 64:375-383

مصطلحات موضوعية: Fluid Flow and Transfer Processes, Convection, Natural convection, Materials science, Mechanical Engineering, Prandtl number, Schmidt number, Thermodynamics, Laminar flow, Condensed Matter Physics, Physics::Fluid Dynamics, symbols.namesake, Heat generation, Mass transfer, Heat transfer, symbols

الوصف: We investigate the unsteady hydro magnetic free convection by laminar flow of a Newtonian, viscous, electrically conducting and heat generation/absorbing fluid on a continuously vertical permeable surface in the presence radiation effect, chemical reaction and the mass flux. Numerical results were obtained using an efficient numerical method called: Network simulation method for several parameters, such as Prandtl number, Schmidt number, heat absorption coefficient, magnetic field parameter and permeability parameter. We have shown that a good agreement exists between the present results and those in the literature. Mainly it was found that increases in values of time, chemical reaction parameter, absorption radiation parameter, Schmidt number and permeability parameter were associated with increase in the velocity profile, while increases in heat generation parameter, Schmidt number, Prandtl number, magnetic field parameter and permeability parameter led to a decrease in the velocity profile. The results showed that increased the radiation absorption parameter and dimensionless time, led to a rise in the temperature profile, while increases in heat generation parameter and Prandtl number resulted in a decrease in the temperature distribution. Also, it was observed that increases in chemical reaction parameter led to a decrease in the concentration distribution, while decreases in Schmidt number were associated with increases in the concentration distribution.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::74b15492d6da3a90dce97708ef4ef88cTest
https://doi.org/10.1016/j.ijheatmasstransfer.2013.03.074Test

المؤلفون: Joaquín Zueco, Verónica Rubio

المصدر: International Communications in Heat and Mass Transfer. 45:16-22

مصطلحات موضوعية: Physics, Convection, Natural convection, General Chemical Engineering, Thermodynamics, Laminar flow, Mechanics, Condensed Matter Physics, Hartmann number, Atomic and Molecular Physics, and Optics, Forced convection, Physics::Fluid Dynamics, Heat flux, Combined forced and natural convection, Heat generation

الوصف: The study of unsteady mixed convection flow in a vertical channel with symmetric and asymmetric wall heating conditions is considered in this article. The boundary conditions used are isothermal–isothermal, isoflux–isothermal, and isothermal–isoflux for the left–right walls of the channel. The effects of the Hartmann number, convection parameter and heat generation/absorption coefficient are included in the numerical analysis. Graphic results with various values of the parameters involved are presented. The numerical solutions of the equations representing the process are obtained by the Network Simulation method. The results obtained in the steady-state were compared with the results of Chamkha [10] and were very close. The numerical procedure employed, which satisfies the conservation law for the heat flux variable, also permits the direct visualization and evolution of the local and/or integrated transport variables at any point or section of the medium.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::8844114c3b20a6022fa4e101e9b4350bTest
https://doi.org/10.1016/j.icheatmasstransfer.2013.03.008Test

المؤلفون: Verónica Rubio Hernández, Joaquín Zueco

المصدر: Chemical Engineering Communications. 199:1205-1224

مصطلحات موضوعية: Chemistry, General Chemical Engineering, Schmidt number, Prandtl number, Grashof number, Thermodynamics, Laminar flow, General Chemistry, Mechanics, Heat transfer coefficient, Hartmann number, Laminar flow reactor, Physics::Fluid Dynamics, symbols.namesake, Heat generation, symbols

الوصف: This study addresses the transient heat and mass transfer problem by laminar flow of a Newtonian, viscous electrically conducting, and heat generating/absorbing fluid on a continuously moving permeable surface. It was carried out with the well-known network simulation method. The effect of the parameters involved in the process were analyzed, so the influence of the parameters is represented graphically for several cases. The dimensionless parameters used in this study are: chemical reaction parameter, Prandtl number, Grashof number, absorption coefficient or heat generation, Schmidt number, and Hartmann number. The results presented are important because of the relevance of the conclusions for the steady and transient cases. In the study, the flow was considered laminar and two-dimensional. In addition, the transverse magnetic field is uniform and viscous dissipation effects, Hall effect, and Joule heating are omitted.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::19b1af04de2a1db0ea9220d6e44db9aeTest
https://doi.org/10.1080/00986445.2011.620659Test