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Experimental investigations were conducted to examine the influence of surface enhancement on crystallization fouling in a double pipe heat exchanger operating under forced convective heat transfer.Moreover, it substantially reduced fouling resistance.Sodium sulfate at its saturation concentration was utilized, leading to precipitation on the outer surface of the tube due to counter-current flow of the hot fluid.Notably, installing the coiled wire insert on the outer surface of the inner tube was more effective in reducing fouling resistance compared to installing it on the inside surface.The study focused on evaluating the impact of surface enhancement on heat transfer coefficient and fouling resistance for both smooth and enhanced surfaces.The experiments involved using a hot fluid (salt solution) at 40?C and Reynolds number ranging from 5300 to 20,000, while a cold fluid (distilled water) at 10?C with Reynolds number ranging from 13,000 to 22,000 was circulated through the inner tube.Surface enhancement was achieved by incorporating a coiled wire insert either inside or outside the inner tube.
Experimental investigations were conducted to examine the influence of surface enhancement on crystallization fouling in a double pipe heat exchanger operating under forced convective heat transfer. The experiments involved using a hot fluid (salt solution) at 40°C and Reynolds number ranging from 5300 to 20,000, while a cold fluid (distilled water) at 10°C with Reynolds number ranging from 13,000 to 22,000 was circulated through the inner tube. Sodium sulfate at its saturation concentration was utilized, leading to precipitation on the outer surface of the tube due to counter-current flow of the hot fluid.
The study focused on evaluating the impact of surface enhancement on heat transfer coefficient and fouling resistance for both smooth and enhanced surfaces. Surface enhancement was achieved by incorporating a coiled wire insert either inside or outside the inner tube. Results indicated that surface enhancement increased heat transfer rates by 150% to 80% depending on Reynolds numbers for the hot and cold fluids. Moreover, it substantially reduced fouling resistance. Notably, installing the coiled wire insert on the outer surface of the inner tube was more effective in reducing fouling resistance compared to installing it on the inside surface.
The effectiveness of surface enhancement in reducing fouling was more pronounced at lower Reynolds numbers for both hot and cold fluids. The reduction in fouling resistance due to surface enhancement ranged from 86% at low Reynolds numbers to 46% at high Reynolds numbers for both hot and cold fluids.
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