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首页> 外文期刊>International Journal of Heat and Mass Transfer >Anti-fouling performance of chevron plate heat exchanger by the surface modification
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Anti-fouling performance of chevron plate heat exchanger by the surface modification

机译:人字形板式换热器的表面防污性能

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摘要

In this study, we aimed to develop a method for modifying SUS304 with microanoscale holes using an electrical etching technique, and evaluated its impact on the anti-fouling performance of chevron plate heat exchangers. The modified SUS304 specimen exhibited hydrophobic wetting characteristics; however, water droplets stuck to the wall under inclined orientations at angles of 30 degrees and 60 degrees. We coated the modified SUS304 specimen with polymer (polymethyl methacrylate; PMMA) and hexagonal boron nitride (BN) particles to realize the hydrophobic and superhydrophobic wetting characteristics. To evaluate the anti-fouling performance of the heat exchanger, we carried out fouling acceleration experiments in a 2000 ppm CaCO3 solution for 2 h. The anti-fouling performance was determined by measuring the overall heat transfer coefficients during fouling acceleration experiments. As the operation time increased, the CaCO 3 particles were deposited on the surface of the heat exchanger, the overall heat transfer coefficient decreased, and the fouling factor ultimately increased. Out of bare, modified, PMMA- and BN-coated heat exchangers, the PMMA-coated heat exchanger exhibited the strongest anti-fouling performance, with the lowest increment in the fouling factor. Based on analysis of the contact angle hysteresis (CAH) in each case, we suggest that CaCO3 particles in solution would be deposited better in the case of the highest CAH. This is possible in cases without the triple contact line, and is caused by filling the polymer into microano holes on the modified surface. (C) 2019 Elsevier Ltd. All rights reserved.
机译:在这项研究中,我们旨在开发一种使用电刻蚀技术对带有微米级/纳米级孔的SUS304进行改性的方法,并评估其对人字形板式换热器防污性能的影响。改性后的SUS304试样具有疏水润湿特性。然而,水滴在倾斜方向以30度和60度的角度附着在墙上。我们用聚合物(聚甲基丙烯酸甲酯; PMMA)和六方氮化硼(BN)颗粒涂覆改性的SUS304样品,以实现疏水和超疏水润湿特性。为了评估热交换器的防污性能,我们在2000 ppm CaCO3溶液中进行了2 h的污垢加速实验。通过在结垢加速实验过程中测量总传热系数来确定防结垢性能。随着操作时间的增加,CaCO 3颗粒沉积在热交换器的表面上,总传热系数降低,结垢因子最终增加。在裸露的,改性的,涂有PMMA和BN的换热器中,涂有PMMA的换热器表现出最强的防污性能,污垢系数的增加最小。基于每种情况下的接触角滞后(CAH)分析,我们建议在最高CAH的情况下,溶液中的CaCO3颗粒沉积会更好。这在没有三重接触线的情况下是可能的,并且是通过将聚合物填充到改性表面上的微/纳米孔中引起的。 (C)2019 Elsevier Ltd.保留所有权利。

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