ABSTRACT
Transport phenomena in engineering fields involve three types of transfer: energy or heat transport, mass transport and momentum transport or fluid dynamics. This chapter describes physical mechanisms of three types of transport phenomena. Heat is transported from the steel plate to its surroundings by the three modes of heat transfer, which are generally recognized as conduction, convection and radiation. Energy can be transported not only due to thermal gradient, but also due to bulk fluid flow. Variations in the velocity of a fluid can result in momentum transport, just as variations in temperature and concentration result in heat and mass transport. The irreversible phenomenon known as heat transfer occurs when there a temperature difference in a medium or between media. While a temperature gradient stands for the driving potential for heat transfer, a species concentration gradient in a mixture provides the driving potential for the mass transfer of that species.
