对不不凝气aspen 研发工程师给出了如下的看法:
“建议你采用Mass transfer模型计算带有不凝气的冷凝。 Mass transfer film model是基于Colburn-Hougen 校正系数来处理不凝气,并且采用Colburn-Drew 较正式处理多级压缩计算. 这个模型是基于软件默认的Silver-Bell平衡校正模型.
我们Aspen的研发人员已经开发了一些不同的方法来预测冷凝气的膜传递系数校正,不过目前来看,如果你的组分气体(包括不凝气)已知条件非常准确的条件下,采用mass transfer方法还是最准确的。
另外,如果大家这方面的知识感兴趣,推荐你两个文献,可以研究一下:
Design of Cooler Condensers for Mixtures of Vapor with Noncondensing Gases, A. P. Colburn and O. A. Hougen, Industrial and Engineering Chemistry, November 1939
An Assessment of Design Methods for Condensation of Vapors from a Noncondensing Gas, J. M. McNaught, Heat Exchanger Theory and Practice, McGraw-Hill Book Co., 1983”
软件说明:
“There is an option to use an HTFS adaptation of the Colburn-Hougen method for condensation of a vapor from a non-condensing gas. This is a mass-transfer model which requires additional data relating to the diffusion coefficient, or properties from which it can be calculated. The method is used with the integral condensing curve which you supply (or which Shell&Tube calculates). This method as implemented in Shell&Tube will not provide additional information on the distribution of components between the liquid and vapor phase.”
从字面理解,这个传质模型和塔计算时的传质模型还是类似的。不做换热专业,没有合适的条件去很好的验证这些东西。
[ 本帖最后由 lty 于 2009-8-29 10:40 编辑 ] |