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首页> 外文会议>International Conference on Boiling Heat Transfer(ICBHT 2003); 20030504-08; Montego Bay(JM) >HEAT TRANSFER MECHANISMS DURING THE NUCLEATE BOILING PROCESS FROM WOVEN MESH SCREEN STRUCTURES: IDENTIFICATION OF ENHANCING AND LIMITING EFFECTS
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HEAT TRANSFER MECHANISMS DURING THE NUCLEATE BOILING PROCESS FROM WOVEN MESH SCREEN STRUCTURES: IDENTIFICATION OF ENHANCING AND LIMITING EFFECTS

机译：机织网筛结构在核沸腾过程中的传热机理：增强和限制作用的识别

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摘要

The results of an investigation into the heat transfer mechanisms during nucleate boiling from a vertical heater with a combination of two enhancement techniques are presented. The techniques employed are roughening of the heater surface and the attachment of one or more layers of mesh., Heat transfer tests have been carried out with a vertical metal heater using distilled water and R 141 b as the working fluids. Four different types of mesh screen and four different heater surface conditions have been tested, resulting in experimental and theoretical data, which allowed the prediction of the heat transfer mechanisms from submerged planar surfaces incorporating mesh structures. To assist in the correlation of heat transfer coefficients from woven mesh screen structures and to ensure that the correlation is based upon the mechanisms which occur during boiling from mesh covered surfaces, visual records of the of the boiling process have been examined. A transparent heater with a conductive indium tin oxide (ITO) film, sandwiched between two layers of silicon dioxide (SiO_2), coated on a quartz glass plate was used so that the vapour bubbles interacting with the mesh and the working fluid could be examined in detail from the reverse of the heater while illumination was provided from the front. Several enhancing and limiting effects on the heat transfer have been identified from an analysis of the experimental results obtained during the visualisation tests. Combining the visualisation results with heat transfer data has resulted in the development of a semi-theoretical correlation applicable to nucleate boiling from mesh screen porous structures.
机译：给出了结合两种增强技术对立式加热器中的核沸腾过程中的传热机理进行研究的结果。所采用的技术是加热器表面的粗糙化和一层或多层筛网的附着。已使用立式金属加热器使用蒸馏水和R 141b作为工作流体进行了传热测试。测试了四种不同类型的网状筛网和四种不同的加热器表面条件，得出了实验和理论数据，这些数据可以从包含网状结构的浸没平面中预测传热机理。为了辅助编织网筛结构的传热系数的相关性并确保相关性基于从网状覆盖表面沸腾期间发生的机理，已经检查了沸腾过程的视觉记录。使用了透明加热器，该加热器带有一层导电铟锡氧化物（ITO）膜，夹在两层二氧化硅（SiO_2）之间，并涂覆在石英玻璃板上，这样可以检查蒸汽气泡与筛网和工作流体的相互作用。加热器背面的细节，而正面则提供照明。根据对可视化测试过程中获得的实验结果的分析，已经确定了对传热的几种增强和限制作用。将可视化结果与传热数据相结合，已经导致了半理论相关性的发展，该相关性适用于网筛多孔结构的核沸腾。

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