Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

2007, Volume 9, Issue 12

Abstract

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Strategic Study of CAE >> 2007, Volume 9, Issue 12

Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

中国科学院广州能源研究所，广州 510640,中国科学院广州能源研究所，广州 510640,中国核动力研究设计院空泡物理和自然循环国家级重点实验室，成都 610041

Funding project：中国核动力研究设计院空泡物理和自然循环重点实验室2005年基金资助项目（51482080105ZK7601）

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Abstract

Pressure drops of flow boiling in a single microchannel having low aspect ratio were studied with effects of the inlet temperature，mass flux，heat flux and the inclined angle using methanol as working fluid. The present experimental data were compared with the predictions of the homogeneous flow model and separated flow model respectively. The comparison indicates that the homogeneous flow model cannot predict the twophase pressure drop well except using the twophase viscosity model of the Dukler correlation. With the existing correlations for parameter C in LockhartMartinelli correlation such as Chisholm,Lee and Lee,Mishima,Qu and Mudawar , separated flow model also failed to predict the twophase pressure drop in the microchannel of this study . The experimental data in this work show that the interaction between vapor phase and liquid phase is decreased with the increasing quality when the quality reach a certain value , accordingly there needs a correlation for C which decreased with the decreasing mass flux .A new correlation to predict the twophase flow pressure drop in microchannels was developed in the form of the LockhartMartinelli correlation .It includes the effect of the hydraulic diameter and the effect of mass flux on the twophase flow pressure drop in microchannels .The new correlation developed in this study predicted the experimental data within a mean absolute error of 16.9%.

Keywords

pressure drop characteristics ; homogeneous flow model ; separated flow model ; microchannel ; flow boiling

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References

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