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Critical Flow of Water Under Supercritical Pressures

[+] Author Affiliations
Yuzhou Chen, Minfu Zhao, Chunsheng Yang, Keming Bi, Kaiwen Du, Shuming Zhang

China Institute of Atomic Energy, Beijing, China

Paper No. IHTC14-22156, pp. 319-326; 8 pages
doi:10.1115/IHTC14-22156
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 2
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4937-8 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

An experiment on critical flow of water was conducted in two nozzles of 1.41 mm in diameter and 4.35 mm in length with rounded-edge and sharp-edge respectively, covering the ranges of inlet pressure of 22.1–29.1 MPa and inlet temperature of 38–474 °C. More than 200 data points were obtained. The characteristics and the parametric trends were investigated. In the region of near and beyond pseudo-critical temperature the thermal equilibrium is dominant, and the flow rate can be represented by the modified homogeneous equilibrium model reasonably. In the below pseudo-critical region the results exhibit scattered feature as a result of hysteresis effect in the onset of vaporization, characterizing a bifurcation behavior. This effect is more significant in the nozzle with sharp-edge, especially at higher pressure. For the temperature well below the pseudo-critical point the flow is not at critical condition and is represented by the Bernoulli equation.

Copyright © 2010 by ASME

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