EXACT SOLUTION OF HEAT-TRANSFER FROM A STRETCHING SURFACE WITH VARIABLE HEAT-FLUX

An exact expression of the temperature distribution is constructed for the heat transfer from a stretching surface with prescribed power law heat flux. The stretching velocity is inversely proportional to the o ne third power of the distance measured along the surface from a thin slit. The final result is expressed in terms of hypergeometric functio ns. Although the exact solution is accomplished, some physically unrea listic phenomena are encounters for specific conditions. The temperatu re parameter which prescribe the surface heat flux, strongly affects t hose situations. Two types of temperature distribution are discussed: dimensionless temperatures with and without scaling to the dimensionle ss surface temperature. The expression of the temperature distribution without scaling is lucid to understand the heat transfer characterist ics.