Why can't you measure the temperature of multiphase flow's?

by Topher925
Tags: flow, measure, multiphase, temperature
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Apr8-09, 09:20 PM
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I've read from many sources that thermocouples or any other type of thermal transducer can't accurately measure the temperature of multiphase flows but none of them explain why. For instance, a mixture of air and ethanol going through a fuel line at 80 C. Why is it that if you stick a thermocouple in the fuel line to measure temperature, it won't give you an accurate result? At 80C there shouldn't be much of an effect of radiative heat transfer and given a steady flow and temperature there should be no issues with changes in convective heat transfer. So what gives, why can't you do this?
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