HEAT AND MASS TRANSFER ANALYSIS OF STEADY AND UNSTEADY NANOFLUID FLOW OVER A STRETCHING SHEET WITH DOUBLE STRATIFICATION

摘要

Attention is focused on heat and mass transfer by a stretched surface over a nanofluid in a steady and unsteady state in the presence of a magnetic field, thermal stratification, and solutal stratification. The proper partial differential equations governing the boundary-layer flow, heat and mass transfer are reduced to ordinary differential equations by using the similarity variable technique and solved numerically by using the Galerkin finite-element method. A parametric analysis of all pertinent parameters is carried out and a descriptive set of numerical results for the velocity, temperature, and concentration profiles as well as the skin-friction parameter, Nusselt number, and Sherwood number is demonstrated through graphs and tables. It is determined that temperature profiles deteriorate as thermal stratification parameter S-t increases, furthermore, the concentration profiles also decline when solutal stratification parameter S-m increases.