Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Liang , Nan; Shuangquan , Shao; Tian , Changqing; Yan , Y.Y. (2010)
Publisher: Elsevier
Languages: English
Types: Article
Subjects: refrigeration, [ SPI.MECA.THER ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], evaporator, instability, two phase flow, [ PHYS.MECA.THER ] Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph]
Abstract It is essential to ensure the stability of a refrigeration system if the oscillation in evaporation process is the primary cause for the whole system instability. This paper is concerned with an experimental investigation of two phase flow instabilities in a horizontal straight tube evaporator of a refrigeration system. The relationship between pressure drop and mass flow with constant heat flux and evaporation pressure is measured and determined. It is found that there is a negative slope section in the middle of positive slope pressure drop versus mass flow velocity thus making the velocity a multi-valued function of pressure drop. Three types of dynamic instabilities including the density wave instability, pressure drop instability and thermal instability are found under the conditions of heat flux from 5 to 17 kW/m2, mass velocity from 150 to 1500 kg/(m2?s), and evaporating pressure from 0.5 to 0.8 MPa. The density wave oscillation occurs at almost all mass velocities; its period is about 1?3 seconds and its amplitude is the lowest. The pressure drop oscillation takes place in a negative slope section; its period is about 10 seconds. The thermal oscillation can be induced at a high mass flow velocity, and its period is of 60 seconds and the amplitude is the highest among the three oscillations. The boundary as the onset of pressure drop oscillation and that of thermal oscillation are obtained experimentally. Finally, the empirical equations for the boundaries between three types of oscillations are obtained according to the mathematical model and test data. correspondence: Corresponding author. Tel.: +44 115 951 3168, Address: B31 Lenton Firs Building, University Park, Nottingham NG7 2RD, UK. (Yan, Y.Y.) (Yan, Y.Y.) Technical Institute of Physics and Chemistry, Chinese Academy of Sciences Beijing 100190 - CHINA (Liang, Nan) Graduate University of Chinese Academy of Sciences - Beijing 100049--> - CHINA (Liang, Nan) Technical Institute of Physics and Chemistry, Chinese Academy of Sciences Beijing 100190 - CHINA (Shuangquan, Shao) Technical Institute of Physics and Chemistry, Chinese Academy of Sciences Beijing 100190 - CHINA (Tian, Changqing) Faculty of Engineering, the University of Nottingham, University Park - NottinghamNG7 2RD--> - UNITED KINGDOM (Yan, Y.Y.) UNITED KINGDOM (Yan, Y.Y.) CHINA UNITED KINGDOM Received: 2009-10-31 Revised: 2010-08-30 Accepted: 2010-08-31
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [10] J.S. Barnhart, J.E. Peters, An experimental investigation of entrained liquid carry-over from a serpentine evaporator, International Journal of Refrigeration 18 (1995) 343-354.
    • [11] W.D. Gruhle, R. Isermann, Modeling and control of a refrigerant evaporator, Journal of Dynamic System, Measurement, and Control 107 (1985) 235-240. T
    • [12] M. Ledinegg, Instability of flow during natural and forced circulation, Die Waerme P61 (8) I
    • (1938) 891-898. R C
    • [13] P. Saha, M. Ishii, N. Zuber, An experimental investigation of the thermally induced two-phase flow oscillations two-phase systems, Transactions of ASSME, Journal of Heat Transfer 98 (1976) 616-622. U
    • [14] M. Aritomi, S. AoId, A. Inoue, Instabilities in parallel Nchannel of forced-convection boiling upflow system, (II) Experimental results, AJournal of Nuclear Science and Technology14 (2) (1979) 88-96. M
    • [15] D.M. France, R.D. Carlson, R.P. Roy, MeDasurement and analysis of dynamic instabilities in fluid-heated two-phase flow, InternatioEnalJournal of Heat and Mass Transfer 29 (12) (1986) 1919-1929. T P
    • [16] B. Xu, X. Chen, An experimental investigation of twophase flow density wave type E
    • instability in vertical upflow tube, in: Proceedings of 2nd International Symposium on C
    • Multiphase Flow and Heat Transfer, 1989, Xian, China, Hemisphere, New York, 1990. C
    • [17] Q. Wang, X.J. Chen, Experimental research on pressure-drop type oscillation in A
    • medium-high pressure system, in: T.N. Veziroglu (Ed.), Multiphase Transport and Particulate Phenomena, vol. 2, Hemisphere, New York, 1990, pp. 345-351.
    • [18] Q. Wang, S. Kakac, X.J. Chen, Y. Ding, An Experimental investigation of density-wave
    • [19] Z. Gao, J. Li, L. Qian, Analysis of stability in a low pressure, low quality and two phase
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article