共查询到19条相似文献,搜索用时 46 毫秒
1.
2.
3.
在内径Φ30 0mm的填料塔中研究了孔板波纹填料的结构参数对液相轴向混合特性、流体力学和传质性能的影响 .研究结果表明 ,轴向返混参数随开孔率、倾角的增加及盘高的减小而增加 ,填料层压降随开孔率、盘高的增加及倾角的减小而降低 ,传质单元高度随倾角的增加、盘高的减小而降低 ,开孔率对传质单元高度的影响有一个适宜值 .通过对实验数据的回归分析得出了轴向返混参数、填料层压降及传质单元高度的关联式 .该研究结果对孔板波纹填料的开发与设计具有参考价值 相似文献
4.
塑料孔板波纹填料的结构参数对其流体力学性能的影响 总被引:1,自引:1,他引:0
在内径为300mm的填料塔中,以空气—水为物系,研究了塑料孔板波纹填料的结构参数对其流体力学性能的影响。研究结果表明,填料层压降△P/Z随开孔率φ、盘高H的增加及倾角β的减小而降低。通过对实验数据的回归,得出了填料层压降△P/Z的关联式。该研究结果对塑料孔板波纹填料的开发与设计具有参考价值。 相似文献
5.
6.
在内径φ300mm的填料塔中,以空气-水-氨为物系,研究了塑料孔板波纹填料的结构参数对其传质性能的影响。研究结果表明,气相总传质单元高度HOG随着倾角β的增加、盘高H的减小而降低;开孔率φ对气相总传质单元高度HOG的影响有一个适宜值。通过对实验数据的回归分析,得出了气相总传质单元高度HOG的关联式。 相似文献
7.
8.
9.
10.
11.
操作参数对费托合成液态烃影响的研究 总被引:1,自引:0,他引:1
熔铁催化剂对 F- T( Fischer- Tropsch)合成具有较高的活性 ,耐磨强度好 ,价格低廉 ,至今在 F- T合成中仍具有相当重要的地位 .F- T合成液相产物中的化学族组分的相对含量及烷、烯烃的分布是考察操作条件的重要指标 ,通过熔铁催化剂在单管固定床反应器中的 F- T合成反应 ,对不同工艺参数条件下所得产物中的液态烃进行色谱分析后 ,得到了合成的液态烃产物随操作参数的变化规律 ,尤其是得出了液态烃产物中的烯 /烷的相对变化的规律 . 相似文献
12.
介绍了聚合物基复合材料的基本概念,增强材料,包括玻璃纤维、碳纤维及芳纶纤维的定义,特点,生产厂家:详细介绍了玻璃纤维的外观特性、密度、抗拉强度、弹性模量、柔性(脆性)、化学稳定性;从化学分析、含水率、浸润剂、纱线线密度、纱线拉伸断裂强力、纱线硬挺度、短切性、分散性、纱线悬垂度、成带性、单位面积质量均匀性、浸透速率、苯乙烯溶解度等方面,阐述了玻璃纤维质量对FRP质量的影响。 相似文献
13.
由于板翅式换热器结构的复杂性,存在着内部流动速度分布的不均匀性,从而引起其换热效率下降,影响了换热器的整体效能.引起流动速度分布不均匀的因素是多方面的,针对不同导流片结构参数(h/H)对导流片导流性能的影响进行了深入研究,发现导流片结构参数对换热器内部流动速度分布不均匀性的影响主要表现在总管流动方向上,通过改变板翅式换热器导流片的结构参数可有效地改善换热器内部物流在总管流动方向上的分配情况,从而有效地改善换热器内部流动速度的分布.研究结果对板翅式换热器的优化设计具有重要意义. 相似文献
14.
E. A. Ibrahim 《Chemical Engineering Communications》1997,161(1):25-44
The effect of compressibility of fluids on the instability of a liquid sheet issued from a nozzle into an ambient gas is investigated by use of linear stability analysis. It is found that increasing the gas Mach number from subsonic to transonic causes the maximum growth rate, dominant wave number, and cut-off wave number of disturbances to increase. Liquid compressibility has a minimal effect on instability. At a constant wave number, the growth rate of disturbances increases as the gas Mach number tends to 1 and then begins to decline with further increase in the gas Mach number. Hence, liquid sheet breakup is due to surface disintegration not gross fracturing in agreement with experimental observations. At small values of wave number, antisymmetrical disturbances grow faster than symmetrical ones while the growth rate of both types of disturbances approach each other at large wave numbers. At small Weber number, antisymmetrical disturbances exhibit a higher maximum growth rate and a lower dominant wave number than symmetrical disturbances. However, the maximum growth rate and dominant wave number of the two types of disturbances are almost identical when Weber number becomes large. An increase in the gas-to-liquid density ratio enhances the instability. Surface tension always opposes the development of instability. 相似文献
15.
The Markov process with discrete state and time is used to simulate the distribution of liquid flow in apacked column.The theoretical prediction agrees well with the experimental data. 相似文献
16.
17.
粘度对表面活性剂液膜溶胀的影响 总被引:2,自引:1,他引:2
从实验和理论两方面探讨了粘度对液膜夹带溶胀及渗透溶胀的影响.当乳状液粘度超过50mPa·s时,夹带溶胀随乳状液粘度的增加而降低.膜相粘度的增加会导致渗透溶胀的减少.并提出了各粘度区估算溶胀率的数学模型,且模型值和实验数据吻合良好. 相似文献
18.
19.
A comparison has been made between the catalytic effects of two groups of elements on the steam gasification of carbon: the alkaline earths and noble transition metals of Group VIII. Spectroscopically pure graphite was selected as a model carbon because it consists of well-defined crystals with a large number of atoms located in basal planes, which, without a catalyst, are of low reactivity. Moreover, foreign atoms which can enhance or inhibit catalysis are eliminated. Local overheating is prevented by the endothermic reaction with steam.
It is not possible to distinguish unambiguously reaction-rate increases associated with a lowering of the activation energy and those caused by an increase of the reaction-site density. Thus conclusions about the mode of catalyst action are by necessity tentative. However, evidence from electron micrographs, in connection with elemental maps and theoretical calculations indicates that catalysis in the case of alkaline earths can be explained essentially by an increase of the reaction-site density. A close contact between these catalysts and the carbon surface is preserved during the reaction. In contrast, metals of Group VIII have a tendency to coalesce and to become isolated from the graphite surface. Here a lowering of the activation energy is a distinct possibility due to intercalation of these metals and weakening of the C-C bonds which are to be severed in the carbon gasification. 相似文献
It is not possible to distinguish unambiguously reaction-rate increases associated with a lowering of the activation energy and those caused by an increase of the reaction-site density. Thus conclusions about the mode of catalyst action are by necessity tentative. However, evidence from electron micrographs, in connection with elemental maps and theoretical calculations indicates that catalysis in the case of alkaline earths can be explained essentially by an increase of the reaction-site density. A close contact between these catalysts and the carbon surface is preserved during the reaction. In contrast, metals of Group VIII have a tendency to coalesce and to become isolated from the graphite surface. Here a lowering of the activation energy is a distinct possibility due to intercalation of these metals and weakening of the C-C bonds which are to be severed in the carbon gasification. 相似文献