Investigation of critical heat flux enhancement on nanoengineered surfaces in pressurized subcooled flow boiling using infrared thermometry
Investigation of critical heat flux enhancement on nanoengineered surfaces in pressurized subcooled flow boiling using infrared thermometry
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DOI：
10.1080/01457632.2023.2191441
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发表时间：
2023-03
影响因子：
2.3
通讯作者：
Chia-Yun Wang;G. Su;Olorunsola Akinsulire;Limiao Zhang;Md Mahamudur Rahman;M. Bucci
中科院分区：
文献类型：
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作者：
Chia-Yun Wang;G. Su;Olorunsola Akinsulire;Limiao Zhang;Md Mahamudur Rahman;M. Bucci
摘要提高流动沸腾临界热流密度（CHF）有利于提高沸腾冷却工业应用的经济性和安全裕度。虽然许多研究已经表明，具有亲水性纳米尺度和微米尺度特征的表面可以增强池沸腾中的CHF，但仍然不清楚这些工程表面如何影响环境压力下过冷流动沸腾中的CHF，更不用说高压条件了。这里，有两个纳米工程表面，即，测试了涂覆有亲水性二氧化硅纳米颗粒的多孔层的表面和涂覆有氧化锌纳米线的表面。采用红外测温诊断技术，在10 K过冷度和1000 kg/（m2·s）质量流量下，在1bar和4 bar压力下进行了流动沸腾实验。在1巴下，两种涂层的CHF增强约为15%。在4巴下，CHF增强对于纳米线表面为约17%，并且对于纳米多孔表面为约25%。红外测温测量表明，CHF的增强来自于两相传热和单相传热机制的增加，这是由于纳米工程表面上的气泡动力学的变化。它还表明，沸腾危机可以预测使用基于蒙特卡罗（MC）模拟的渗流模型。
Abstract Enhancing the flow boiling critical heat flux (CHF) is beneficial to the economics and safety margins of many industrial applications cooled by boiling heat transfer. While many studies have shown that surfaces with hydrophilic nanoscale and micro-scale features can enhance CHF in pool boiling, it is still not clear how these engineered surfaces affect the CHF in subcooled flow boiling at ambient pressure, let alone high-pressure conditions. Here, two nano-engineered surfaces, i.e., a surface coated with a porous layer of hydrophilic silica nanoparticles and a surface coated with zinc oxide nanowires, were tested. Flow boiling tests with a 10 K subcooling and a mass flux of 1000 kg/(m2·s) were conducted at 1 bar and 4 bars using infrared thermometry diagnostics. At 1 bar, the CHF enhancement is around 15% for both coatings. At 4 bars, the CHF enhancement is around 17% for the nanowire surface, and around 25% for the nano-porous surface. Infrared thermometry measurements reveal that the CHF enhancement comes from an increase of both two-phase heat transfer and single-phase heat transfer mechanisms, which is due to a change of bubble dynamics on the nanoengineered surfaces. It is also shown that the boiling crisis can be predicted using a percolation model based on Monte Carlo (MC) simulations.