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Novel Thin-Sol-Gel Coatings for Biofouling Prevention and Easy Removal

Picture for Novel Thin-Sol-Gel Coatings for Biofouling Prevention and Easy Removal
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There is a critical need to mitigate undesirable fouling of seawater-based titanium heat exchangers (HEs) used in US Navy vessels. Heat exchangers are widely used in Navy ships to cool operating fluids and gases, and seawater is the preferred cooling medium since it is readily available. However, fouling will form while ocean water circulates through the heat exchanger tubes or plates, decreasing the heat transfer efficiency and increasing fluid resistance.

Product Number: 51323-19037-SG
Author: Fernando Farelas, Rebecca Martin, Zak Bear, Charles Carfagna, Benjamin Pinkston
Publication Date: 2023
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$20.00
$20.00

Heat exchangers are widely used in Navy ships to cool operating fluids and seawater is the preferred cooling medium since it is readily available. However, biofouling will form while ocean water circulates through the heat exchanger tubes or plates, decreasing the heat transfer efficiency and increasing fluid resistance. Further fouling eventually results in more energy consumption and a decrease in heat exchanger service life. To solve the biofouling problem, we developed thin and durable sol-gel coatings that significantly decreased biofouling deposition and facilitated its removal. The developed coatings were applied to titanium substrates and immersed for 64 days at Pearl Harbor, HI. Biofouling formation was followed by taking high-resolution images to quantify the type and extent of biofouling formation. Biofouling adhesion was evaluated by water jet at different nozzle pressures. In addition, the thermal conductivity of the coatings was measured and used as an input parameter for thermal simulations to determine the effect of the coating thickness on the efficiency of a shell and tube heat exchanger.

Heat exchangers are widely used in Navy ships to cool operating fluids and seawater is the preferred cooling medium since it is readily available. However, biofouling will form while ocean water circulates through the heat exchanger tubes or plates, decreasing the heat transfer efficiency and increasing fluid resistance. Further fouling eventually results in more energy consumption and a decrease in heat exchanger service life. To solve the biofouling problem, we developed thin and durable sol-gel coatings that significantly decreased biofouling deposition and facilitated its removal. The developed coatings were applied to titanium substrates and immersed for 64 days at Pearl Harbor, HI. Biofouling formation was followed by taking high-resolution images to quantify the type and extent of biofouling formation. Biofouling adhesion was evaluated by water jet at different nozzle pressures. In addition, the thermal conductivity of the coatings was measured and used as an input parameter for thermal simulations to determine the effect of the coating thickness on the efficiency of a shell and tube heat exchanger.

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Reinforced Thermosetting Resin Pipes (RTRP) Failures & Quality Control Measures Adopted During Construction of The Largest LNGI facility in Kuwait

Product Number: 51323-18799-SG
Author: Faisal Al-Refai, Yousef J. Mansour, Fahad Al-Qanaee, Anas Abdelmotelb
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Novel antimicrobial heat-conducting “metallic” coatings against biofouling and biocorrosion
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Novel Heat-Conducting “Metallic” Coatings Against Biofouling And Biocorrosion

Product Number: 51322-18178-SG
Author: Di Wang, Timothy D. Hall, Tingyue Gu
Publication Date: 2022
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Seawater biofouling is a major threat in heat exchanger operations. It decreases the heat transfer efficiency and service life of heat exchangers1,2. The formation of deposits caused by biofouling on the heat exchanger metal surfaces increases surface roughness and decreases cross-sectional flow area, which leads to higher friction loss in fluid flow3,4. Mitigation methods, including surface scrubbing, fluidizing bed heat exchangers, cleaning-in-place and dosing anti-fouling chemicals, are the main ways to tackle biofouling5. Conventional approaches to treat biofouled components by periodic electrochlorination or acid flushes are costly and environmentally hazardous. Huge costs are associated with heat exchanger biofouling losses, but there is still a lack of research to develop heat-conducting antifouling coatings to heat exchangers3.
Picture for 01480 ON-BOARD HYPOCHLORITE GENERATION FOR
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01480 ON-BOARD HYPOCHLORITE GENERATION FOR BIOFOULING CONTROL

Product Number: 51300-01480-SG
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Author: B. Zwicker, J. Porter, G. Pelletier, R.D. Klassen and P.R. Roberge
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