García Sergio, Trueba Alfredo, Vega Luis M, Madariaga Ernesto
a Department of Sciences & Techniques of Navigation and Ship Construction , University of Cantabria , Santander , Spain.
Biofouling. 2016 Nov;32(10):1185-1193. doi: 10.1080/08927014.2016.1241875.
The present study evaluated biofilm growth in AISI 316L stainless steel tubes for seawater-cooled exchanger-condensers that had four different arithmetic mean surface roughness values ranging from 0.14 μm to 1.2 μm. The results of fluid frictional resistance and heat transfer resistance regarding biofilm formation in the roughest surface showed increases of 28.2% and 19.1% respectively, compared with the smoothest surface. The biofilm thickness taken at the end of the experiment showed variations of up to 74% between the smoothest and roughest surfaces. The thermal efficiency of the heat transfer process in the tube with the roughest surface was 17.4% greater than that in the tube with the smoothest surface. The results suggest that the finish of the inner surfaces of the tubes in heat exchanger-condensers is critical for improving energy efficiency and avoiding biofilm adhesion. This may be utilised to reduce biofilm adhesion and growth in the design of heat exchanger-condensers.
本研究评估了用于海水冷却式换热器冷凝器的AISI 316L不锈钢管中的生物膜生长情况，这些管子具有四个不同的算术平均表面粗糙度值，范围从0.14μm到1.2μm。与最光滑表面相比，在最粗糙表面上生物膜形成的流体摩擦阻力和传热阻力结果分别增加了28.2%和19.1%。实验结束时测得的生物膜厚度在最光滑和最粗糙表面之间变化高达74%。表面最粗糙的管子中传热过程的热效率比表面最光滑的管子高17.4%。结果表明，换热器冷凝器内表面的光洁度对于提高能源效率和避免生物膜附着至关重要。这可用于在换热器冷凝器的设计中减少生物膜的附着和生长。
