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Effect of Surfactants on Liquid–Solid Heat Transfer on High‐Temperature Wall
Steel Research International ( IF 2.2 ) Pub Date : 2020-09-19 , DOI: 10.1002/srin.202000321
Xiuhua Tian 1 , Tianliang Fu 1 , Zhaodong Wang 1 , Guodong Wang 1
Affiliation  

During the quenching of high‐temperature steel plate, Leidenfrost phenomenon takes place, which prevents the coolant from extracting heat from high‐temperature wall. Adding surfactant to the basic fluid can reduce the surface tension, increase the solid–liquid contact area, and ultimately increase the cooling speed. Herein, aqueous solutions of 240 ppm cetyl trimethyl ammonium bromide (CTAB), 600 ppm sodium dodecyl sulfate (SDS), and 56 ppm polyoxyethy‐lene (20) sorbaitan monolaurate (Tween‐20) are used as coolants. Using a 50 mm thick high‐temperature AISI304 stainless steel plate, free surface jet experiments are designed and completed to study the influence of different coolants on the surface heat transfer and internal thermal conductivity. The experimental results show that surfactants can reduce the surface tension, which enhance the wettability of the fluid on the surface, whereas the time it takes for the fluid to completely wet the experimental region is shortened by up to 13.87%. The foaming can increase the width of wetting front and hinder the expansion speed of the wetted region. When aqueous Tween‐20 with low surface tension and low foaming is used as the coolant, the maximum heat flux increases by 12.11%, 7.03%, 9.33%, 7.70%, and 4.41% compared with that of pure water.

中文翻译:

表面活性剂对高温壁液固传热的影响

在高温钢板淬火过程中,发生莱顿弗罗斯特现象,这阻止了冷却剂从高温壁吸热。在基础流体中添加表面活性剂可以降低表面张力,增加固液接触面积,并最终提高冷却速度。在本文中,使用240 ppm十六烷基三甲基溴化铵(CTAB),600 ppm十二烷基硫酸钠(SDS)和56 ppm聚氧乙稀(20)山梨酸单月桂酸酯(Tween-20)的水溶液作为冷却剂。使用50 mm厚的高温AISI304不锈钢板,设计并完成了自由表面射流实验,以研究不同冷却剂对表面传热和内部导热率的影响。实验结果表明,表面活性剂可以降低表面张力,这提高了流体在表面上的润湿性,而使流体完全润湿实验区域所需的时间缩短了多达13.87%。发泡会增加润湿前沿的宽度并阻碍润湿区域的膨胀速度。当使用低表面张力和低泡沫的Tween-20水溶液作为冷却剂时,与纯水相比,最大热通量增加了12.11%,7.03%,9.33%,7.70%和4.41%。
更新日期:2020-09-19
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