TEMPERATURE FIELD AND HEAT TRANSFER IN LOW REYNOLDS FLOWS INSIDE TRAPEZOIDAL-PROFILED CORRUGATED-PLATE CHANNELS

摘要

This article is focused on research into convective heat transfer in horizontally configured heat exchange systems. The research employed trapezoidal-shaped heated sections with forced air cooling at low Reynolds number values (Re = 2344 and 2704). Directional tubing was installed into the stream of forced airflow in an attempt to increase the heat transfer coefficients. The temperature fields created in the area around the shaped heated surfaces were visualized using noncontact holographic interferometry. The resulting interferogram images were used to define local and mean heat transfer parameters for various geometric configurations of heat exchange systems with changes in the quantity of airflow. The Colburn J-factor (j) and the coefficient of friction (f) were introduced in order to assess heat exchange systems in terms of heat transfer and pressure losses. Placing directional tubing between the heated surfaces led to an increase in the heat transfer parameters, but pressure losses also increased significantly.