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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >The effect of temperature on the void fraction in gas-liquid reactors
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The effect of temperature on the void fraction in gas-liquid reactors

机译：温度对气液反应器中空隙率的影响

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The holdup of air and water vapour dispersed in water has been measured in a H = 2T reactor of 0.45 in diameter at temperatures up to boiling point at ambient pressure. The single shaft agitator comprised a hollow blade BT-6 dispel-sing impeller surmounted by two up-pumping Maxflo wide-blade hydrofoils. The gas holdup in these experiments was adequately correlated in terms of the specific power input and superficial gas phase velocity over the whole range of liquid temperature by the dimensional (SI) equation: epsilon(GH) = 69 x 10(6) (P-m)(0.2)(V-s)(0.55)(O-K)(-3 2) The equation shows the dependence of void fraction oil temperature: in this aqueous system it fell to about half that at room temperature as the boiling point is approached. The presence of any gas, whether generated or introduced, will maintain a sparged regime. Conditions are very different in a well mixed, unsparged, vessel containing a boiling liquid. Except when operating at high pressures, significant vapour will only be present in the uppermost levels of the liquid with little vapour at depth. The results imply that most existing hot-sparged reactors have possibly been designed with incorrect estimates of the void fraction maintained during operation. (C) 2003 Elsevier Inc. All rights reserved. [References: 11]
机译：已在直径为0.45的H = 2T反应器中，在高达常压下的沸点的温度下，测量了空气和水蒸气在水中的扩散。单轴搅拌器包括一个空心叶片BT-6驱除叶轮，该叶轮由两个向上泵送的Maxflo宽叶片水翼安装。这些实验中的气体滞留率在整个液体温度范围内的比功率输入和表观气相速度方面均通过尺寸（SI）方程充分相关：epsilon（GH）= 69 x 10（6）（Pm） （0.2）（Vs）（0.55）（OK）（-3 2）该方程式显示出空隙率油温的依赖性：在该含水体系中，随着接近沸点，它降至室温下的一半。任何气体的产生，无论产生还是引入，都将维持喷射状态。在装有沸腾液体的充分混合，未喷射的容器中，条件有很大不同。除非在高压下运行，否则仅在液体的最上层中会存在大量蒸气，而深度处的蒸气很少。结果表明，大多数现有的热喷射反应器可能在设计过程中对运行期间保持的空隙率进行了不正确的估算。 （C）2003 Elsevier Inc.保留所有权利。 [参考：11]

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