Combined Effects of Hall Current and Radiation on MHD Free Convective Flow in a Vertical Channel with an Oscillatory Wall Temperature

• 作者: Rabindra Nath Jana Sanatan Das Sankar Kumar Guchhait
• 来源期刊: 流体动力学(英文)
• 学科: 医学
• 关键词: Hall Current MHD Free Convection RADIATION Prandtl NUMBER Grashof NUMBER Frequency Parameter IMPULSIVE MOTION Accelerated MOTION
• 年，卷（期）: 2013,（1）
• 页码范围: 9-22
• 页数: 14页
• 分类号: R73

摘要

The combined effects of Hall current and radiation on an unsteady MHD free convective flow of a viscous incompressible electrically conducting fluid in a vertical channel with an oscillatory wall temperature have been studied. We have considered two different cases 1) flow due to the impulsive motion of one of the channel walls and 2) flow due to the accelerated motion of one of the channel walls. The governing equations are solved analytically using the Laplace transform technique. It is found that the primary velocity and the magnitude of the secondary velocity increase with an increase in Hall parameter for both the impulsive as well as the accelerated motions of one of the channel walls. An increase in either radiation parameter or frequency parameter leads to decrease in the primary velocity and the magnitude of the secondary velocity for both the impulsive as well as accelerated motions of one of the channel walls. The fluid temperature decreases with an increase in radiation parameter. Further, the shear stresses at the left wall reduce with an increase in either radiation parameter or frequency parameter for both the impulsive as well as the accelerated motions of one of the channel wall.