共查询到20条相似文献,搜索用时 125 毫秒
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对通用CFD模拟软件——FLUENT进行了综述,介绍了该软件的应用领域、主要特点。由于FLUENT软件的突出优点,对实际应用有重大的指导作用。通过简述FLUENT软件在混合器设备中复杂流场的模拟,为现有的混合设备的优化与新产品的研发提供指导性参数,指出了FLUENT软件在液-液混合领域潜在的发应用前景。 相似文献
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利用粒子图像测速技术(PIV),对 Beckmann 重排反应器中混合器的错流射流混合过程进行了观测,获得了二维冷模装置内的流场分布信息;同时运用计算流体力学软件 FLUENT6.1模拟了三维混合器内快速射流混合过程,考察了挡板对三维混合器内流场的影响。研究结果表明,有挡板的混合器的出口浓度分布更为均匀,出口截面的未混合度σ低于0.005,远远小于临界值0.05。因此,混合腔内增置挡板对混合器的混合效果有明显改善。 相似文献
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以高压液气(汽)管式快速混合反应器(简称高压混合器)在水溶液全循环尿素合成塔中的应用为研究对象,通过建立数学模型、对模型进行热力学分析、建立计算模型等,开发出具有计算和对话功能的模拟软件。应用模拟软件计算未安装和安装高压混合器的不同情况,分析结果并提出结论,从而在理论上阐述高压混合器对提高水溶液全循环法尿素合成塔CO2转化率的作用。 相似文献
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Tobias Rothenfluh Martin J. Schuler Philipp Rudolf von Rohr 《The Journal of Supercritical Fluids》2011,57(2):175-182
In hydrothermal spallation deep drilling a high-velocity, hot, supercritical water jet is directed towards the rock to induce fragmentation. One major challenge in the realization of this novel technique is the entrainment of comparatively cool, aqueous drilling fluid by the hot water jet, which can lead to significant heat losses before the hot jet's energy can be transferred to the rock. The present work quantifies such entrainment effects by determining penetration lengths of supercritical water jets injected into a cool, subcritical environment using a novel optical Schlieren method. Penetration lengths of supercritical jets were found to be equal to the injector's nozzle diameter and almost independent of the jet's temperature at the nozzle exit and the jet's mass flow under almost all experimental conditions investigated. A semi-empirical model adapted from steam jet studies confirmed these findings and indicates that heat and mass transfer are primarily controlled by turbulent mixing. 相似文献
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Micro-climatic environmental conditions inside a greenhousewith a built-in solar distillation system
A numerical study was carried out to investigate the micro-climatic environmental conditions inside a greenhouse-distillation system, self-sufficient for irrigating water. The greenhouse consists of the planting cavity, circulating air channels and roof solar distiller for the production of a rather modest rate of irrigating water. A turbulent, steady-state flow, energy and humidity concentration equations were solved using the numerical code FLUENT 6.1. Velocity vectors, steam function, isotherms and temperature and humidity distribution inside the greenhouse present the resultant: micro-climatic environmental conditions. The results are presented for hot days where cold and humid air (from the evaporative cooler) enters the greenhouse from one side and is circulated through the partially porous cavity (representing the plants) and flows through air flow channels and leaves from a vertical thermal chimney. The results show that, with the selected inlet flow conditions, the flow velocity, temperature, and relative humidity can be within the comfort values for plant growth. The effect of some important environmental, design, and operational parameters on greenhouse micro-climatic conditions has also been highlighted. 相似文献
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对延迟焦化装置冷焦热水罐溢出气体中硫化氢含量超标原因进行了分析,采取了工艺改进措施,使超标问题得以解决,并提出了彻底解决硫化氢含量超标的建议。 相似文献
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对含不凝气体蒸汽射流在冷水中直接接触冷凝现象进行了实验研究,通过测量流场中的温度分布确定汽羽长度,进而推导其传热系数。实验使用直径为1.6 mm的圆形喷嘴,出口混合气体质量流量密度在100~330 kg·m-2·s-1之间,不凝气体的含量在0~15%之间,冷水温度在300~340 K之间。实验结果表明:不凝气体的加入,使喷嘴出口附近的温度下降减慢;汽羽长度随不凝气体含量的增加而变长,其受喷嘴出口质流密度和过冷度的影响规律与纯蒸汽射流一致;冷凝传热系数在0.7~2 MW·m-2·K-1之间,随过冷度的增大和不凝气体含量的增加而减小,受气体流量的影响较小。对实验数据进行拟合,获得了汽羽长度的关联式,并由此得到了冷凝传热系数关联式。 相似文献
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