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首页> 外文期刊>Journal of Heat Transfer >Pool Boiling Heat Transfer Characteristics of Inclined pHEMA-Coated Surfaces
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Pool Boiling Heat Transfer Characteristics of Inclined pHEMA-Coated Surfaces

机译：倾斜pHEMA涂层表面的池沸腾传热特性

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摘要

New requirements for heat exchangers offered pool boiling heat transfer on structured and coated surfaces as one of the promising methods for effective heat removal. In this study, pool boiling experiments were conducted on polyhydroxyethylmethacrylate (pHEMA)-coated surfaces to investigate the effect of surface orientation on bubble dynamics and nucleate boiling heat transfer. pHEMA coatings with thicknesses of 50, 100, and 200 nm were deposited using the initiated chemical deposition (iCVD) method. De-ionized water was used as the working fluid. Experiments were performed on horizontal and inclined surfaces (inclination angles of 10 deg, 30 deg, 50 deg, and 70 deg) under the constant heat flux (ranging from 10 to 80 kW/m2) boundary condition. Obtained results were compared to their plain surface counterparts, and heat transfer enhancements were observed. Accordingly, it was observed that the bubble departure phenomenon was affected by heat flux and wall superheat on bare silicon surfaces, while the supply path of vapor altered the bubble departure process on pHEMA-coated surfaces. Furthermore, the surface orientation played a major role on bubble dynamics and could be considered as a mechanism for fast vapor removal from surfaces. Bubble coalescence and liquid replenishment on coated surfaces had a promising effect on heat transfer coefficient enhancement on coated surfaces. For horizontal surfaces, a maximum enhancement of 25% relative to the bare surface was achieved, while the maximum enhancement was 105% for the inclined coated surface under the optimum condition. iCVD was proven to be a practical method for coating surfaces for boiling heat transfer applications due to the obtained promising results.
机译：换热器的新要求是在结构化和涂层表面上进行池沸腾传热，这是有效去除热量的有希望的方法之一。在这项研究中，在聚甲基丙烯酸羟乙酯（pHEMA）涂层表面上进行了池沸腾实验，以研究表面取向对气泡动力学和核沸腾传热的影响。使用初始化学沉积（iCVD）方法沉积厚度为50、100和200 nm的pHEMA涂层。去离子水用作工作流体。在恒定的热通量（范围为10至80 kW / m2）边界条件下，在水平和倾斜表面（倾斜角为10度，30度，50度和70度）上进行了实验。将获得的结果与其平的表面对应物进行比较，并观察到传热增强。因此，观察到气泡离开现象受到裸硅表面上的热通量和壁过热的影响，而蒸气的供应路径改变了pHEMA涂覆的表面上的气泡离开过程。此外，表面取向在气泡动力学中起主要作用，并且可以被认为是从表面快速去除蒸气的机制。涂层表面上的气泡聚结和液体补给对涂层表面传热系数的提高有希望的效果。对于水平表面，在最佳条件下，相对于裸露表面，最大增强为25％，而对于倾斜涂层表面，最大增强为105％。由于获得了令人鼓舞的结果，iCVD被证明是用于沸腾传热应用的表面涂层的实用方法。

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  • 来源
    《Journal of Heat Transfer》 |2017年第11期|111501.1-111501.11|共11页
  • 作者

    Khalili Sadaghiani Abdolali; Reza Motezakker Ahmad; Volkan Özpinar Alsan; Ozaydin Ince Gozde; Koşar Ali;

  • 作者单位

    Mechatronics Engineering Program, Center of Excellence for Functional Surfaces and Interfaces, Sabanci University, Orta Mahalle, Tuzla, Istanbul, Turkey;

    Mechatronics Engineering Program, Center of Excellence for Functional Surfaces and Interfaces, Sabanci University, Orta Mahalle, Tuzla, Istanbul, Turkey;

    Materials Science and Nanoengineering Program, Sabanci University, Orta Mahalle, Tuzla, Istanbul, Turkey;

    Faculty of Engineering and Natural Sciences, Sabanci University Nanotechnology and Applications Center (SUNUM), Sabanci University, Orta Mahalle, Tuzla, Istanbul, Turkey;

    Mechatronics Engineering Program, Center of Excellence for Functional Surfaces and Interfaces, Sabanci University, Orta Mahalle, Tuzla, Istanbul, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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  • 正文语种 eng
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