Regarding the K value of the external coil
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I would like to ask fellow sailors: I currently have a cyclone separator made of carbon steel, with high-temperature powdered alumina as the material inside it. External coil tubes are installed around the cylinder of the cyclone separator, through which cooling water is passed to absorb the heat generated by the cyclone and thus cool the alumina. I would like to ask what range is appropriate for a similar total heat transfer coefficient K value?
With this cylinder plus the coiled tube, the surface of the coil is in line contact with the cylinder’s surface, resulting in almost no contact area – so how can there be any heat transfer?
Change the plan quickly! Don’t ask about the K value, because your A (area) value is ≈0!
A single character difference wasted half a day.
I didn’t express myself clearly; I’m sorry. So, under such circumstances, what is the typical range for the K value?