管内疏水壁面纳米流体的传热与减阻特性研究  

Studies on heat transfer and fluid dynamic characteristics of internal nanofluids flow with hydrophobic channel wall

作　　者：高栋栋 白敏丽[1] 胡成志[1] 吕继组[1] 王晨飞 张雪[2] GAO Dongdong;BAI Minli;HU Chengzhi;LU Jizu;WANG Chenfei;ZHANG Xue(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《热科学与技术》2023年第3期233-241,共9页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51876027,51476019,51806028,51806029);中央高校基本科研业务费专项资金资助项目(DUT19JC09,DUT20JC21)。

摘　　要：纳米流体强化对流传热的同时,往往不可避免地增加流动阻力,这将增大泵功,造成能量的浪费。疏水壁面具有减阻的特性,将纳米流体与疏水壁面相结合,试图达到既强化传热,又减小流动阻力的目的。多数的疏水壁面制备工艺,仅可处理小尺寸的平直壁面,而无法在面积和曲率较大如管路内壁面做疏水处理。利用简单的置换反应方法,辅以低表面能苯甲酸修饰剂,制备得到了疏水的铜管内壁面。纳米流体在疏水壁面的对流传热和流动阻力实验结果表明,体积分数2.000%的SiO_(2)/DI-water纳米流体,可将对流传热系数提高18.10%,同时使达西摩擦系数降低4.9%。纳米流体和疏水壁面的搭配组合,是推动纳米流体在传热领域中广泛应用的有效方案。Nanofluids for heat transfer application suffer from inevitable pump power consumption.The hydrophobic treatment for heat transfer surface may be a prospective strategy to achieve heat transfer enhancement and flow resistance reduction.However,the limitations of hydrophobic treatment technique make it difficult to fabricate desirable large size hydrophobic surface such as inner surface of tube.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 18.10% and the Darcy friction factor decreases to 4.9% at the volume concentration of 2.00% when SiO,/DI-water(Deionized water)nanofluids flow through the hydrophobic surface.The nanofluid flowing through hydrophobic surface strategy provides an effective scheme for wide applications of nanofluids in heat exchange equipment.

关 键 词：纳米流体 微纳结构 疏水壁面 强化传热 流动减阻 

分 类 号：TK405[动力工程及工程热物理—动力机械及工程]