We need to size a shell and helical coil heat exchanger in order to melt sulfur by using the heat from saturated steam inside the coil. We have difficulty to find correlations about the heat transfer coefficient on the exterior surface of the coil where sulfur will be melting. Any help will be highly appreciated.
the sulfur is changing phase, so try to search for two-phase heat transfer correlations (Klimenko, Shah, etc...)
Thank you for your prompt response. The difficulty to find this correlation is related to the geometry of the surface (external surface of a coil).
Hello Naouel
When the sulfur melt, you need to consider the heat required from ambient temperature to sulfur melting point(115.2 °C) and the heat required to melt the sulfur( latent heat of melting) - 39.2kj/kg. Instead of looking for a correlation, I recommend to calculate the heat coefficient by using the basic heat transfer phenomena on cylindrical geometry. Good luck.
MrBelacew .... straight tubes comletely differe from coiled tubes. Coil geometrical parameters as curvarure ratio and torsion in addition to number of turns and coil pitch affect the outside heat transfer coefficient.
I totally agree with M. Mohamed Salem. Many researches showed that the use of an helical coil heat exchanger increases the heat transfer coefficient compared to a similarly dimensioned straight tube heat exchanger.
Naoule and Mohamed, I agree with you for the concept,the heat transfer for the coil and straight tube variation. But if you are working for practical design, I think it will be a good start to find the heat transfer coefficient for straight tube. Then you may get some inter correlation for the coil and normal pipe.
About heat transfer coefficients in an helically coiled heat exchanger, I found this review presenting interesting correlations :
"A review of flow and heat transfer characteristics in curved tubes- Paisarn Naphon, Somchai Wongwises- Renewable and Sustainable Energy Reviews,10 (2006), p.463–490"
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