Module 4 • Ecology: Ice Follies Part 3: Double Tube, Countercurrent Process
1. Now you’ll need to alter your setup to allow you to pour the hot and cold water in opposite directions, as shown in Figure 3.
To do this, create short extension tubes on the intake side of both the inner and outer tubes so that each funnel can be held high enough to allow the water to flow all the way through. Tape the intake side of the outer tube well so that the water does not leak out.
2. Experiment with your setup until it works properly, then repeat the previous set of experiments, except pour the hot and cold water through opposite ends of the tubes to achieve opposite, or countercurrent flow.
Record your ending temperatures in the graph below.
Double Tube, Countercurrent: Results
Trial Warm Start (outer) End Temp.
Trial 1 Trial 2 Trial 3
Cold Start (inner) End Temp.
Warm Start (inner) End Temp.
Cold Start (outer) End Temp.
Figure 3
Student Page 4-5a
Results and Conclusions
Examine the results. How do the end temperatures compare to one another for each procedure? Which process warmed the cold water the most? The least? Which cooled the warm temperature the most?