Hydrophobic surface-assisted SiO2/DI-water nanofluids for enhancing heat transfer and reducing flow resistance. (30th December 2020)

• Record Type: Journal Article
• Authors: Gao, Dongdong; Bai, Minli; Hu, Chengzhi; Lv, Jizu; Gao, Linsong; Li, Yang; Zhang, Xue
• Is Part Of: Nanotechnology. Volume 32:Number 12(2021)
• Publication Date: 2020-12-30
• Subjects: nanofluids -- micro-nano structure -- hydrophobic tube -- convection -- heat transfer enhancement -- flow resistance reduction; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abd0b3
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Nanofluids for heat transfer application suffer from inevitable pump power consumption and adhesion effect with interface during flow. The hydrophobic treatment for heat transfer surface may be one of the most prospective strategies to achieve heat transfer enhancement and flow resistance reduction. However, the limitations of hydrophobic treatment technique and process make it difficult to fabricate desirable large size and high curvature hydrophobic surface. Herein, a facile displacement reaction method is applied to prepare the lath-like silver crystals and micro-nano gaps in the inner surface of copper tube with assistance of benzoic acid dispersant. The result shows that the convective heat transfer coefficient increases to 18.1% and the Darcy friction factor decreases to 4.9% at the volume concentration of 2.0% when SiO2 /DI-water (deionized water) nanofluids flow through the hydrophobic surface. The hydrophobic surface-assisted strategy may provide an effective scheme for wide applications of nanofluids in heat exchange equipment.