Heat Transfer Enhancement During Water and Hydrocarbon Condensation on Lubricant Infused Surfaces

by:angelacrox     2020-06-08
Steam condensation is often used as an effective means of transferring heat or separating fluids.
Drip condensation is where discrete droplets are formed on the surface of the condenser, which provides potential improvements in heat transfer up to an order of magnitude compared to film condensation, which covers the surface.
Low surface tension fluid condensate such as hydrocarbons poses a unique challenge because the typical drain condenser coating used to promote water droplets condensation generally does not reject fluid with lower surface tension.
Recent work indicates that the lubricant is injected into the surface (LIS)
It can promote the formation of droplets of hydrocarbons.
In this work, we confirm the effectiveness of LIS in promoting drip condensation by providing experimental measurements of heat transfer performance during hydrocarbon condensation on LIS, compared to uncoated surfaces, it enhances heat transfer by about 450%.
We also explore improvements by removing non-condensed gases, and highlight a failure mechanism where falling droplets run out of lubricant over time.
Enhanced condensation heat transfer of low surface tension fluid on LIS provides an opportunity for significant energy savings in natural gas processing and improvements in thermal management, heating and cooling, and power generation.
Steam condensation is often used as an effective means of transferring heat or separating fluids.
Film condensation is common in typical industries
Proportional systems in which condensate fluids form thin liquid films due to high energy associated with many industrial materials.
Instead, Dropwise condensation, the condensate forms discrete droplets, which grow, gather, and fall off, and the heat transfer performance is increased by an order of magnitude compared to the film condensate.
In the process of water condensation, the drip pattern is promoted with a thin hydrophobic coating.
However, low surface tension fluid condensate (such as hydrocarbons) poses a unique challenge because of the typical drain condenser coating used to remove water (
Surface tension = 73 mn/m)
Fluid with low surface tension is usually not rejected (
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