The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Ioan Pop - One of the best experts on this subject based on the ideXlab platform.
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Radiation effects on the MHD flow near the stagnation point of a stretching sheet: revisited
Zeitschrift für angewandte Mathematik und Physik, 2011Co-Authors: Ioan Pop, Anuar Mohd Ishak, Fazlina AmanAbstract:This paper considers the effects of radiation on the flow near the two-dimensional stagnation point of a stretching sheet immersed in a viscous and incompressible electrically conducting fluid in the presence of an applied constant magnetic field. The External Velocity and the stretching Velocity of the sheet are assumed to vary linearly with the distance from the stagnation point. The governing partial differential equations are transformed into a system of ordinary differential equations using a similarity transformation, before being solved numerically by the Keller-box method. The features of the heat transfer characteristics for different values of the governing parameters are analyzed and discussed. The results indicate that the heat transfer rate at the surface decreases in the presence of radiation.
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magnetohydrodynamic mhd flow of a micropolar fluid towards a stagnation point on a vertical surface
Computers & Mathematics With Applications, 2008Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:The steady MHD mixed convection stagnation point flow towards a vertical surface immersed in an incompressible micropolar fluid is investigated. The External Velocity impinges normal to the wall and the wall temperature is assumed to vary linearly with the distance from the stagnation point. The governing partial differential equations are transformed into a system of ordinary differential equations, which is then solved numerically by a finite-difference method. The features of the flow and heat transfer characteristics for different values of the governing parameters are analyzed and discussed. Both assisting and opposing flows are considered. It is found that dual solutions exist for the assisting flow, besides that usually reported in the literature for the opposing flow.
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Mixed convection boundary layer flow over a vertical surface embedded in a thermally stratified porous medium
Physics Letters A, 2008Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:Abstract The mixed convection boundary layer flow through a stable stratified porous medium bounded by a vertical surface is investigated. The External Velocity and the surface temperature are assumed to vary as x m , where x is measured from the leading edge of the vertical surface and m is a constant. Numerical solutions for the governing Darcy and energy equations are obtained. The results indicate that the thermal stratification significantly affects the surface shear stress as well as the surface heat transfer, besides delays the boundary layer separation.
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Dual solutions in mixed convection flow near a stagnation point on a vertical surface in a porous medium
International Journal of Heat and Mass Transfer, 2007Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:The steady stagnation point flow through a porous medium bounded by a vertical surface is investigated in this study. The External Velocity, which normally impinges the vertical surface and the surface temperature are assumed to vary linearly with the distance from the stagnation point. The governing system of partial differential equations is first transformed into a system of ordinary differential equations, and then they are solved numerically by a finite-difference scheme, namely the Keller-box method. The features of the flow and heat transfer characteristics for different values of the governing parameters are analyzed and discussed. Both cases of assisting and opposing flows are considered. It is found that dual solutions exist for assisting flow, besides that usually reported in the literature for opposing flow. Therefore, the reported results are completely new.
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Dual Solutions in Magnetohydrodynamic Mixed Convection Flow Near a Stagnation-Point on a Vertical Surface
Journal of Heat Transfer, 2007Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Norihan Md. Arifin, Ioan PopAbstract:The steady magnetohydrodynamic (MHD) mixed convection stagnation-point flow toward a vertical heated surface is investigated in this study. The External Velocity impinges normal to the vertical surface and the surface temperature are assumed to vary linearly with the distance from the stagnation point. The governing partial differential equations are transformed into a system of ordinary differential equations, which is then solved numerically by a finite-difference method. The features of the flow and heat transfer characteristics for different values of the governing parameters are analyzed and discussed. Both assisting and opposing flows are considered. It is found that dual solutions also exist for the assisting flow, besides that usually reported in the literature for the opposing flow.
Anuar Mohd Ishak - One of the best experts on this subject based on the ideXlab platform.
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Magnetohydrodynamic flow and heat transfer of a Jeffrey fluid towards a stretching vertical surface
Thermal Science, 2017Co-Authors: Kartini Ahmad, Anuar Mohd IshakAbstract:This study investigates the steady-mixed convection boundary layer flow near a stagnation point that runs about a linearly stretched vertical surface filled with a Jeffery fluid in the presence of a transverse magnetic field. It is assumed that the External Velocity impinges normally to the wall and the wall temperature varies linearly with the distance from the stagnation point. The governing partial differential equations that govern the fluid flow are transformed into a set of coupled ordinary differential equations, which are then solved numerically using a finite-difference scheme. The numerical results are presented for some values of parameters, namely the Deborah number γ, the Prandtl number Pr, the magnetic parameter M and the mixed convection parameter λ, for both assisting and opposing flows.
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Radiation effects on the MHD flow near the stagnation point of a stretching sheet: revisited
Zeitschrift für angewandte Mathematik und Physik, 2011Co-Authors: Ioan Pop, Anuar Mohd Ishak, Fazlina AmanAbstract:This paper considers the effects of radiation on the flow near the two-dimensional stagnation point of a stretching sheet immersed in a viscous and incompressible electrically conducting fluid in the presence of an applied constant magnetic field. The External Velocity and the stretching Velocity of the sheet are assumed to vary linearly with the distance from the stagnation point. The governing partial differential equations are transformed into a system of ordinary differential equations using a similarity transformation, before being solved numerically by the Keller-box method. The features of the heat transfer characteristics for different values of the governing parameters are analyzed and discussed. The results indicate that the heat transfer rate at the surface decreases in the presence of radiation.
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magnetohydrodynamic mhd flow of a micropolar fluid towards a stagnation point on a vertical surface
Computers & Mathematics With Applications, 2008Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:The steady MHD mixed convection stagnation point flow towards a vertical surface immersed in an incompressible micropolar fluid is investigated. The External Velocity impinges normal to the wall and the wall temperature is assumed to vary linearly with the distance from the stagnation point. The governing partial differential equations are transformed into a system of ordinary differential equations, which is then solved numerically by a finite-difference method. The features of the flow and heat transfer characteristics for different values of the governing parameters are analyzed and discussed. Both assisting and opposing flows are considered. It is found that dual solutions exist for the assisting flow, besides that usually reported in the literature for the opposing flow.
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Mixed convection boundary layer flow over a vertical surface embedded in a thermally stratified porous medium
Physics Letters A, 2008Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:Abstract The mixed convection boundary layer flow through a stable stratified porous medium bounded by a vertical surface is investigated. The External Velocity and the surface temperature are assumed to vary as x m , where x is measured from the leading edge of the vertical surface and m is a constant. Numerical solutions for the governing Darcy and energy equations are obtained. The results indicate that the thermal stratification significantly affects the surface shear stress as well as the surface heat transfer, besides delays the boundary layer separation.
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Dual solutions in mixed convection flow near a stagnation point on a vertical surface in a porous medium
International Journal of Heat and Mass Transfer, 2007Co-Authors: Anuar Mohd Ishak, Roslinda Mohd. Nazar, Ioan PopAbstract:The steady stagnation point flow through a porous medium bounded by a vertical surface is investigated in this study. The External Velocity, which normally impinges the vertical surface and the surface temperature are assumed to vary linearly with the distance from the stagnation point. The governing system of partial differential equations is first transformed into a system of ordinary differential equations, and then they are solved numerically by a finite-difference scheme, namely the Keller-box method. The features of the flow and heat transfer characteristics for different values of the governing parameters are analyzed and discussed. Both cases of assisting and opposing flows are considered. It is found that dual solutions exist for assisting flow, besides that usually reported in the literature for opposing flow. Therefore, the reported results are completely new.
Gilbert Binder - One of the best experts on this subject based on the ideXlab platform.
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Density and Velocity measurements in turbulent He-air boundary layers
Experimental Thermal and Fluid Science, 1997Co-Authors: Jean-luc Harion, Michel Favre-marinet, Gilbert BinderAbstract:A turbulent boundary layer with large density variations has been generated by tangential injection of air or helium into a boundary layer of air-helium mixtures. Instrumentation based on thermoanemometry has been successfully developed for the investigation of this flow. Analysis of the mean and fluctuating density fields shows that the flow is mainly governed by the ratio of the injection to the External Velocity and that the density ratio plays a secondary role in the mixing process. A slight enhancement of turbulent activity is, however, observed when helium is injected.
Hongyang He - One of the best experts on this subject based on the ideXlab platform.
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External Velocity Aided Coarse Attitude and Position Alignment for Dynamic SINS
IEEE Access, 2018Co-Authors: Jiangning Xu, Hongyang HeAbstract:This paper concerns about the dynamic alignment for the strapdown inertial navigation system (SINS), especially in the case of no GPS assistance. A novel coarse alignment algorithm using External reference Velocity in b-frame is proposed. To get the observation vectors of the optimization-based attitude alignment method, the Velocity algorithm of SINS is derived in the inertial coordinate frame, so the Coriolis Effect can be excluded. Meanwhile, the real-time position of the SINS is approximately located, and the deviation of the gravity vector caused by the vehicle's displacement can be compensated, which further improves the alignment accuracy. Experimental results show that the proposed algorithm performs better than the existing algorithm and it can provide ideal initial conditions for the fine alignment.
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A Fast Damping Algorithm for INS with External Velocity Reference
2017 International Conference on Computer Systems Electronics and Control (ICCSEC), 2017Co-Authors: Feng Li, Jiangning Xu, Hongyang HeAbstract:Under the condition of External Velocity reference, a fast damping method is proposed for fast suppression of the oscillation error of inertial navigation system (INS). In the method, traditional damping network structure in INS is changed to accelerate the attenuation of the vibration error. In traditional damping network structure, the internal damping method is easy to be influenced by the vehicle acceleration without External Velocity reference, while the External damping method has poor dynamic characteristic. So the imposed method increases a forward channel from External Velocity to the damping network to compensate the damping error caused by the vehicle acceleration. According to the dynamic process of system damping, the fast damping network parameters is designed and the turnable parameters are input to the damping network considering the dynamic characteristic and error suppression in the damping process. The simulation and test results show that the settling time of the conventional damping algorithm is about 1 hour, which is shortened to 10 minutes by using the fast damping algorithm with the External Velocity reference.
Jean-luc Harion - One of the best experts on this subject based on the ideXlab platform.
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DENSITY AND Velocity MEASUREMENTS IN TURBULENT HE-AIR BOUNDARY LAYERS
Sciences & Technologie, 2003Co-Authors: A. Soudani, S Bougoul, Jean-luc HarionAbstract:A turbulent boundary layer with large density variations has been generated by tangential injection of air or helium Into a boundary layer of air-helium mixture. Instrumentation based on thermo- anemometry has been successfully developed for the investigation of this flow Analysis or the mean and fluctuating density fields shows that the flow is mainly governed by the ratio of the injection to the External Velocity and that the density ratio plays a secondary role in the mixing processes. However, a sight enhancement of turbulent activity is observed when helium is injected.
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Density and Velocity measurements in turbulent He-air boundary layers
Experimental Thermal and Fluid Science, 1997Co-Authors: Jean-luc Harion, Michel Favre-marinet, Gilbert BinderAbstract:A turbulent boundary layer with large density variations has been generated by tangential injection of air or helium into a boundary layer of air-helium mixtures. Instrumentation based on thermoanemometry has been successfully developed for the investigation of this flow. Analysis of the mean and fluctuating density fields shows that the flow is mainly governed by the ratio of the injection to the External Velocity and that the density ratio plays a secondary role in the mixing process. A slight enhancement of turbulent activity is, however, observed when helium is injected.
