抄録
The influence of variable viscosity on laminar flow heat transfer in duct with rectangular cross-section with small aspect ratio is investigated theoretically and experimentally to obtain fundamental information about plate heat exchanger for highly viscous liquids. The theoretical approach is a numerical solution of the momentum, continuity, and energy equations for two-dimensional duct flow. The variation of velocity and temperature distributions with flow direction are shown. The experimental approach presents the relation between average heat transfer coefficient and operating conditions. As a result, a correlation of Nusslt numbers is given. Experimental results are also presented for the heat transfer duct equipped with the inlet and outlet whose widths are smaller than that of the duct.
