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Also Neil,
It would help me explain the terminology that I use to you if you would go out and find a textbook on Fundamentals of Physics by Sears, or Sears and Zemansky or other equivalent, and read the chapter on the Second Law of Thermodynamics.
Then we might be able to discuss things using the same terminology.
While you are at it you might also pick up a copy of Rouse and Howe 1960 on fluid dynamics, and take a look at how fluids flow around interfering entities. Specifically notice that the practice is not to draw a closed path around a bunch of clearly separable things and declare that this is the relevant cross section for calculating drag force with the Cd parameter. Yes, it is important to take interactions of separate entities into account, but that would be a rational way to proceed.
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