Experiment on the Heat-Transfer of Oil-Cooling Pipe

Abstract

Our object is to perform an exact experiment, in accordance with my own similarity, on oil-cooling of laminar flow in the circular pipe with constant temperature. Here, the similarity is that the mean temperature θ_m of passed flow oil depends not only on G_z=Wc/kL but also on s'=(t_i-t_w)/(t_i-t_∞) and K=ω/R (t_i-t_∞), and these are dimensionless quantities. We have carried out a series of experement on θ_m to G_z under the condition that s' and K have been kept at constant values. And we have varied the values of s' and K at each series of experiment by changing oil or temperature ranges. As the result of our experiments we have made sure that curves of θ_m to G_z are distinguished from the Nusselt's curve and separates with one another by the values of s' or K, and so it can be recognized that my similarity is right.