跳至主要内容

Comparison of One-Dimensional Analysis with Experiment for CO2 Two-Phase Nozzle Flow

Read full paper at:
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52843#.VKs2qMnQrzE

The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, it is measured that the temperature profile in the stream-wise direction of a divergent-convergent nozzle through which CO2 in the supercritical pressure condition is blown down into the atmosphere. In the analysis, a one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium is proposed. In the convergent part of the nozzle the flow is treated as single-phase flow of liquid, whereas in the divergent part the flow is treated as separated two-phase flow with saturated condition. The analytical results indicate that the temperature and the pressure decrease rapidly in the divergent part, and the void fraction increases immediately near the throat. Although this analysis is quite simple, the analytical results can follow the experimental results well within this study.
Cite this paper
Tsuru, W. , Ueno, S. , Kinoue, Y. and Shiomi, N. (2014) Comparison of One-Dimensional Analysis with Experiment for CO2 Two-Phase Nozzle Flow. Open Journal of Fluid Dynamics, 4, 415-424. doi: 10.4236/ojfd.2014.45031. 
 

[1] Nakagawa, M. (2004) Refrigeration Cycle with Two-Phase Ejector. Refrigeration, 79, 856-861.
[2] Akagi, S., Dang, C.B. and Hihara, E. (2006) Experimental Research of Two-Phase Ejector in Carbon Dioxide Heat Pump Cycle. Journals of Japan Society of Refrigerating and Air Conditioning Engineers, 23, 97-104.
[3] Nakagawa, M., Takeuchi, H. and Yokozaki, A. (1998) Performance of Two-Phase Nozzles Using the Refrigerant R134a. Transactions of Japan Society of Mechanical Engineers, Series B, 64, 3407-3413.
[4] Nakagawa, M., Takeuchi, H. and Berana, M.S. (2006) Supersonic Characteristics and Shock Waves in Two-Phase Flow along a Nozzle of a Carbon Dioxide Ejector. Proceedings of the 3rd Asian Conference on Refrigeration and Air-Conditioning, 1, 363-367.
[5] Nakagawa, M. and Sugiura, T. (2000) Shock Waves Caused by Velocity Relaxation in High Speed Mist Flow. Transactions of Japan Society of Mechanical Engineers, Series B, 66, 1495-1502.
[6] Sugiura, T. and Nakagawa, M. (2001) Shock Waves Caused by the Velocity and Temperature Relaxation of Subsonic Mist Flow in a Nozzle. Transactions of Japan Society of Mechanical Engineers, Series B, 67, 2462-2469.
[7] Sudo, Y. and Katto, Y. (1975) Study of Compressible Two-Phase Critical Flows: 1st Report, Principle of Occurrence of Critical Flow. Transactions of Japan Society of Mechanical Engineers, 41, 624-635.
http://dx.doi.org/10.1299/kikai1938.41.624                   eww150105lx
标签：

评论

发表评论

此博客中的热门博文

Does Immigration Promote the Investment of the Monopolistic Firm?

In the present paper, we examine the effect of increasing uncertainty of immigrants’ growth on the optimal timing of investment of a firm that has a monopolistic power over the labor market. It is revealed that when the uncertainty of immigrants’ growth is more than a threshold level, increasing uncertainty of immigrants’ growth accelerates the optimal timing of firms’ investment and enhances the economic growth, even if the uncertainty of immigrants’ growth is formulated by the geometric Brownian motion, which is in sharp contrast to the standard result that an increase in the uncertainty postpones the optimal timing. With an increase in the immigrants over the past ten years, workforces in the host countries have been growing significantly to the extent that the immigrants represent 70% of the increase in the workforce in Europe, and 47% in the United States as OECD indicates. In the present paper, we attempted to investigate the effect of increased uncertainty caused by the growi...
发表评论
阅读全文

Education Policy Implementation: A Mechanism for Enhancing Primary Education Development in Zanzibar

Education is one of the fundamental rights of individuals; therefore, the government of a country needs to develop and strengthen educational policy and quality as well as to ensure that everyone has equal access to basic education. The improvement of access and quality of education in the world is becoming as an essential factor in development, whereas the basic education (primary school), is acknowledged as a foundation of the higher educational development for every country. To fulfill this goal, governments introduce several policies and procedures; however, it requires some reforms and participation from the politician, policymakers, and other stakeholders to re-examine educational policy so that it can lead to multiplication and betterment of the reforms. Educational reforms actually focus on accountability. A positive educational development and reform is very challenging and needs more effort and strategy on how to use and utilize the resources effectively as such it can achie...
发表评论
阅读全文