Heat transfer of a viscoelastlc fluid in a porous channel

摘要

In this paper, the flow of a non-Newtonian viscoelas-tic fluid between two parallel flat plates is studied. The flow occurs between two parallel plates one of which is externally heated. In order to cool the heated plate coolant fluid is injected from the other plate, which is perforated. Two aspects of the flow are investigated, namely, (ⅰ) wall friction, which is a measure for the energy required for coolant injection (ⅱ) heat transfer characteristics. It is found out that the wall friction decreases in case a viscoelastic coolant is used. In contrast, the cooling performance, i.e. the Nusselt number, becomes worse with respect to Newtonian fluid.