I’m not entirely sure what you mean. I was thinking of somehow testing two bowls that:
a) can evaporate and heat conduction takes place as normal
b) cannot evaporate and heat conduction takes place as normal

That would separate the effect of evaporation . (The trouble with blowing on a bowl is that it not only replaces humid air with dry air, it also replaces the hot air with cold air.)

@Shadowart:

Yeah, pretty much.

@All:

One of my friends e-mailed me and suggested this: Take two bowls, fill them to the brim. Cover one with tinfoil that conducts heat well, so we stop evaporation but leave heat conduction intact. Leave the other bowl as normal, to let evaporation happen.

Pretty much the same as the oil idea, except slightly more controllable (as long as the tinfoil conducts heat really well).

I guess now I have to go off and buy two identical bowls, so I can actually do this experiment

I’m pretty sure the same is true for the fan.

The oil idea sounds nice through. Assuming oil boils at a higher temperature than water which I really don’t know anything about.

Well, wouldn’t, in theory, the conduction part of that experiment be conducted by having a topless container of some sort, to allow evaporation to take place, yet have the heat be conducted through the container? (The container would have to be able to hold ice or cold water within its walls, so I suppose setting the bowl inside a salad bowl of ice would work best to test the theory.) This is assuming that the evaporation-test part of the experiment (the bowl with the fan) is meant to test if there was something constantly blowing on the air above the bowl, which the bowl inside a salad bowl of ice would lack. So, if you understand what I just wrote, wouldn’t that be a practical test of the experiment?
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That’s a pretty damn good idea! Maybe I’ll try that

You could just try to put oil in it so that the water won’t evaporate easily, then compare with a normal bowl
Of course the oily soup would probably taste different …