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  • Thermal flux measurement during condensation

    Discussion in 'The main mechanical design forum' started by rgreig, Jan 29, 2013.

    1. rgreig

      rgreig New Member

      Dec 2012
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    3. Michael Ross

      Michael Ross Well-Known Member

      Mar 2012
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      You don't have to put the sensor on the outer surface. You can place it in a sandwich that comprises an outer wall of a container.

      It is hard to do this because the sensor naturally is different from the "un sensored" areas of the container.

      But also you won't get a measure of flux mounted on an outside surface.

      This is tricky. Why not explain a little more about your actual application? You may get better answers. Maybe there is a better metric for what you are trying to do than the heat energy flowing through a bulk material.

      Actually, heat flux is usually measured similarly to resistance - the difference between two locations tells you the flux through the material in that direction. So you could take a group of measurement from the inner and outer walls of your container. You need to be careful about the geometry of the container to be sure you are not seeing local temperatures that are not representative of the overall. The temperature sensors may not have to be very large. I suggest thermistors, you might be able to epoxy them to a surface, they are not expensive, they are accurate particularly if you have a way to calibrate them. They are only good at the temperatures of liquid water. Above and below the range of water you need to use RTDs (fragile and bulky) of thermocouples. Thermopiles are interesting for thick insulation, among other things.

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