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| 1 | Thermal radiation effect on unsteady threedimensional MHD flow of micropolar fluid over a horizontal surface of a parabola of revolution显示文摘This paper explores the time-dependent magnetohydrodynamics(MHD)micropolar fluid flow over a three-dimensional variable stretching surface in the occurrence of radiation effect.The model time-dependent partial differential equations(PDE’s)in three independent variables are transformed into ordinary differential equations(ODE’s)by the suitable selfsimilarity variables.Homotopy perturbation method(HPM)and Runge-Kutta(RK)4^(th) order method along with shooting technique are used in the present model.And also,HPM results are compared with Runge-Kutta(RK)4^(th) order method along with the shooting technique.The velocity,micro rotation in x and y directions,temperature,skin friction factor and heat transfer rates are examined for the emerging parameters.The velocity profiles and momentum boundary layer thickness intensification with increasing values of the vortex viscosity parameter.The higher value of a magnetic parameter declines the skin friction coefficient.This type of investigation may be profitable to the polymer fluids,exotic lubricants,electronic chips,artificial fibers,drawing of copper wires,etc. | S.R.R.Reddy P.Bala Anki Reddy | 2022 | Propulsion and Power Research2022，11，1： | 0 |
| 2 | Nanoparticle aggregation effects on radiative heat transport of nanoliquid over a vertical cylinder with sensitivity analysis显示文摘A sensitivity analysis is performed to analyze the effects of the nanoparticle(NP)aggregation and thermal radiation on heat transport of the nanoliquids(titania based on ethylene glycol)over a vertical cylinder.The optimization of heat transfer rate and friction factor is performed for NP volume fraction(1%≤φ≤3%),radiation parameter(1≤R_(t)≤3),and mixed convection parameter(1.5≤λ≤2.5)via the facecentered central composite design(CCD)and the response surface methodology(RSM).The modified Krieger and Dougherty model(MKDM)for dynamic viscosity and the Bruggeman model(BM)for thermal conductivity are utilized to simulate nanoliquids with the NP aggregation aspect.The complicated nonlinear problem is treated numerically.It is found that the temperature of nanoliquid is enhanced due to the aggregation of NPs.The friction factor is more sensitive to the volume fraction of NPs than the thermal radiation and the mixed convection parameter.Furthermore,the heat transport rate is more sensitive to the effect of radiative heat compared with the NP volume fraction and mixed convection parameter. | B.MAHANTHESH K.THRIVENI | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，3： | 0 |
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