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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical modeling and simulation of condensation heat transfer of a flue gas in a bundle of transport membrane tubes
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Numerical modeling and simulation of condensation heat transfer of a flue gas in a bundle of transport membrane tubes

机译：一束输送膜管中烟气冷凝水传热的数值模拟与模拟

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In this paper, a numerical study has been carried out to investigate the heat and mass transfer characteristics of a condensing combustion flue gas in a cross-flow transport membrane tube bundle. The tube wall is made of a porous material that is able to extract condensate liquid from the flue gas. The flue gas investigated consists of one condensable water vapor (H_2O) and three noncondensable gases (CO_2,O_2, and N_2). A simplified multi-species transport model was developed for the heat and mass transfer of flue gas. The condensation-evaporation process was simulated as a two-step chemical reaction. The RNG two-equation turbulence model was used for the turbulent flow. The numerical study was conducted within ranges of Reynolds number of 1.0 × 10~3-7 × 10~4 based on hydraulic diameter of flue gas channel, and 6.4 × 10~0-3.3 × 10~2 based on inner diameter of the water tube. Flue gas inlet temperature is within the range of 333.2-360.9 K. Numerical results were compared with our experimental data. It has been found that the developed multi-species transport model was able to predict the flue gas heat and mass transfer in the tube bundle with fairly good accuracy. The heat and mass depletion levels decrease with the increase of the flue gas Reynolds numbers. A new Nusselt number correlation was developed for flue gas convection in the tube bundle. Detailed results about temperature, mass fraction, enthalpy, and skin fraction factors are also presented and discussed.
机译：在本文中，已经进行了数值研究以研究错流传输膜管束中的冷凝燃烧烟气的传热和传质特性。管壁由能够从烟道气中提取冷凝液的多孔材料制成。所研究的烟气由一种可冷凝水蒸气（H_2O）和三种不可冷凝气体（CO_2，O_2和N_2）组成。为烟气的传热和传质开发了简化的多物种运输模型。冷凝蒸发过程被模拟为两步化学反应。 RNG两方程湍流模型用于湍流。根据烟道的水力直径，在雷诺数为1.0×10〜3-7×10〜4的范围内，基于水的内径为6.4×10〜0-3.3×10〜2的范围内，进行了数值研究管。烟气入口温度在333.2-360.9 K范围内。将数值结果与我们的实验数据进行了比较。已经发现，开发的多物种运输模型能够以相当好的准确性预测管束中的烟气热量和质量传递。随着烟道雷诺数的增加，热量和质量的消耗水平降低。为管束中的烟气对流开发了新的努塞尔数相关性。还介绍并讨论了有关温度，质量分数，焓和皮肤分数因子的详细结果。

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