Heat Transfer and Fluid Friction During Viscous Flow Across Banks of Tubes

Abstract A co-operative program is in progress for the study of fluid friction and heat transfer in idealized models and in commercial tubular heat exchangers over a wide range of variables and under standardized conditions of equipment and technique. Suitable equipment for rapid and accurate testing of the models is described. Heat-transfer coefficients during cooling, and pressure-drop data during both isothermal and cooling runs are reported for low velocities chiefly in the region of viscous flow over an unbaffled tube bank. The data are plotted in ways previously used in the literature with fair agreement in most cases. It is expected, however, that when data for widely different conditions have been obtained, other methods of correlation may prove more suitable.