Heat and mass transfer characteristics of the self-similar boundary-layer flows induced by continuous surfaces stretched with rapidly decreasing velocities

Heat and Mass Transfer - Tập 38 - Trang 65-74 - 2001
E. Magyari1, M. E. Ali2, B. Keller1
1Chair of the Physics of Buildings Institute of Building Technology Swiss Federal Institute of Technology (ETH) Zürich CH-8093 Zürich, Switzerland, , CH
2Department of Mechanical Engineering College of Engineering, King Saud University Riyadh 11421, PO Box 800, Saudi Arabia, , SA

Tóm tắt

 The mechanical and thermal characteristics of the self-similar boundary-layer flows induced by continuous surfaces stretched with rapidly decreasing power-law velocities U w∝x m , m<−1 are considered. Comparing to the well studied cases of the increasing stretching velocities (m>0) several new features of basic significance have been found. Thus: (i) for m<−1 the boundary layer equations admit self-similar solutions only if a lateral suction is applied; (ii) the dimensionless suction velocity f w<0 must be strong enough, i.e. f w