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首页> 外文期刊>Heat Transfer Engineering >Calculations of Flow Boiling Heat Transfer in a Minichannel Based on Liquid Crystal and Infrared Thermography Data
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Calculations of Flow Boiling Heat Transfer in a Minichannel Based on Liquid Crystal and Infrared Thermography Data

机译：基于液晶和红外热成像数据的微通道流沸腾换热计算

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摘要

This paper analyzes results concerning flow boiling heat transfer in two parallel, asymmetrically heated vertical mimchannels. The heating element for FC-72 Fluorinert flowing in the minichannels was a thin foil with an enhanced surface on the side in contact with the fluid. In one minichannel, changes in the temperature on the smooth side of the foil were monitored using liquid crystal thermography. Changes in the temperature on the outer surface of the glass in one minichannel and on the foil in the other minichannel were observed using infrared thermography. The heat transfer coefficient at the foil-fluid interface was calculated on the basis of one- and two-dimensional heat transfer models. In the two-dimensional method, the distribution of temperature on the enhanced side of the foil was determined by solving the inverse heat conduction problem. The governing equations were solved using the finite-element method combined with the Trefftz functions used as shape functions. The temperature measurement points were located at the boundary nodes of elements. Local values of the heat transfer coefficient calculated with the one- and two-dimensional models were analyzed in the function of the distance from the minichannel inlet. The values obtained with the two models were similar.
机译：本文分析了在两个平行的，不对称加热的垂直微通道中流动沸腾传热的结果。在微型通道中流动的FC-72含氟惰性气体的加热元件是薄箔，其与流体接触的一侧表面增强。在一个小通道中，使用液晶热成像法监测箔片光滑面上的温度变化。使用红外热成像法观察一个小通道中的玻璃外表面和另一小通道中的箔上的温度变化。基于一维和二维热传递模型计算了箔-流体界面处的热传递系数。在二维方法中，通过解决逆导热问题来确定箔的增强侧上的温度分布。使用有限元方法结合Trefftz函数作为形状函数来求解控制方程。温度测量点位于元素的边界节点。利用一维和二维模型计算出的传热系数的局部值是根据距微通道入口的距离的函数进行分析的。通过两个模型获得的值相似。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|332-346|共15页
  • 作者

    Magdalena Piasecka; Kinga Strak; Beata Maciejewska;

  • 作者单位

    Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Kielce, Poland;

    Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Kielce, Poland;

    Faculty of Management and Computer Modeling, Kielce University of Technology, Kielce, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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