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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation on a separated structure shell-and-tube waste heat boiler based on experiment
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Numerical investigation on a separated structure shell-and-tube waste heat boiler based on experiment

机译：基于实验的分离结构管壳式余热锅炉的数值研究

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In the present paper, a novel separated structure shell-and-tube waste heat boiler is investigated through both experimental and numerical methods. The whole numerical model based on a scaled experimental facility is developed to analyze the shell-side thermal-hydraulic performances. Instead of using isothermal boundary condition on the tube wall, a linear heat flux is alternative according to the temperature difference measured in the experiment. The Drift-Flux model is used to solve the vapor-liquid two-phase flow across tube bundle. The commercial software ANYSY Fluent is adopted to conduct numerical computation, and a considerably good accuracy is obtained by comparing with experiment. The pressure drop, void fraction, flow field and heat transfer characteristic of two-phase mixture flow boiling across tube bundle are presented and analyzed in detail, respectively. The results show that the maximum pressure loss occurs at the inlet of risers, which can severely weaken the overall natural circulation. The HTC of heating tubes on the shell-side is mainly determined by void fraction rather than velocity inside the tube bundle, as the latter changes little along flow direction. This work can be as a reference for designers and operators.
机译：本文通过实验和数值方法研究了一种新型的分离结构的管壳式余热锅炉。开发了基于规模化实验设施的整个数值模型，以分析壳侧热工液压性能。代替在管壁上使用等温边界条件，而是根据实验中测得的温差选择线性热通量。 Drift-Flux模型用于求解横穿管束的气液两相流。采用商业软件ANYSY Fluent进行数值计算，与实验比较，具有相当好的精度。分别对沸腾管束两相混合流的压降，空隙率，流场和传热特性进行了详细分析。结果表明，最大的压力损失发生在立管的入口，这会严重削弱整个自然循环。壳侧加热管的HTC主要由空隙率决定，而不是由管束内部的速度决定，因为后者沿流动方向几乎没有变化。这项工作可以为设计人员和操作人员提供参考。

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