Interesting test at 12C ambient. I still expect to see some reduction in temperature even at this low ambient. If the humidity of the air was high, you wouldn't see much evaporation as the damp air could not hold too much water.
I like to be sure that the spray pattern of the water jet is not impeded before making other assumptions. The thread of the water jet is only 4.5mm deep.
For futher cooling below 12C, you can add 25-30% of methanol since the rate of evaporatin for methanol is faster at lower temperatures.
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Richard L
aquamist technical support
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