Abstract The performance of the fluid flow, heat and contaminant transfer is numerically experimented in a slot-ventilated container in which the flow -in and -out are occurred through inlet and exit ports in combination with thermosolutal sources. The inlet source of cold air is mechanically flushed in through left vertical wall to generate mixed convection flow regime combined with the buoyant force produced due to combined thermosolutal effect along right side wall and bottom surfaces. To characterize the system performance and smooth ventilation, a new configuration with the inhomogeneous distribution of thermal and solutal buoyant forces are taken into account. To obtain the physical insights of the flow phenomena, three dimensional structures of the flow field and cooling efficiency distribution are presented over a wide range of dimensionless flow parameters such as: Reynolds number, buoyancy forces and Richardson number to optimize the heat removal rate with maximum diffusion of contaminants. The distribution of average temperature and concentration are evaluated through Nusselt number and Sherwod number, where air change per hour and cooling efficiency are evaluated justifying the experimental observations. The performance evaluation criterion is defined through Bejan number and entropy generation and estimated by the most commonly used parameters to find the influence of inflow and out flow port locations. Interactions between inlet airflow and pressure drop resulting a heat loss through the sides of the component with high streamline curvature effect which can not be predicted in 2D flow pattern. The investigated results show that fluid flow greatly influence the contaminant transfer and exhibit a significant change in movement pattern with the location of inlet and outlet which is typically observed in experiments. The presented results indicate that contaminant's trajectory and effective cooling pattern might be an effective tool to analyze the indoor air quality and investigating the possible denser contaminant areas of the ventilated enclosure.

中文翻译：

---

狭缝通风外壳中气流、热量和质量传递的三维特性

摘要 在狭缝通风容器中对流体流动、热量和污染物传递的性能进行了数值试验，其中流入和流出通过入口和出口结合热溶源进行。冷空气的入口源通过左侧垂直壁以机械方式冲入，以产生混合对流流态，结合由于沿右侧壁和底面的组合热溶效应产生的浮力。为了表征系统性能和平稳通风，考虑了热力和溶质浮力不均匀分布的新配置。为了获得流动现象的物理见解，流场的三维结构和冷却效率分布在广泛的无量纲流动参数（例如：雷诺数、浮力和理查森数）下呈现，以优化除热率并最大限度地扩散污染物。平均温度和浓度的分布通过 Nusselt 数和 Sherwod 数进行评估，其中每小时的空气变化和冷却效率被评估以证明实验观察的合理性。性能评价标准通过 Bejan 数和熵生成定义，并通过最常用的参数估计，以发现流入和流出端口位置的影响。入口气流和压降之间的相互作用导致通过具有高流线曲率效应的组件侧面的热量损失，这在 2D 流型中无法预测。研究结果表明，流体流动极大地影响了污染物的转移，并且随着入口和出口位置的变化，运动模式会发生显着变化，这在实验中通常会观察到。所呈现的结果表明，污染物的轨迹和有效的冷却模式可能是分析室内空气质量和调查通风外壳可能的更密集污染物区域的有效工具。研究结果表明，流体流动极大地影响了污染物的转移，并且随着入口和出口位置的变化，运动模式会发生显着变化，这在实验中通常会观察到。所呈现的结果表明，污染物的轨迹和有效的冷却模式可能是分析室内空气质量和调查通风外壳可能的更密集污染物区域的有效工具。研究结果表明，流体流动极大地影响了污染物的转移，并且随着入口和出口位置的变化，运动模式会发生显着变化，这在实验中通常会观察到。所呈现的结果表明，污染物的轨迹和有效的冷却模式可能是分析室内空气质量和调查通风外壳可能的更密集污染物区域的有效工具。