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Two-phase flow instabilities in a horizontal single boiling channel.

Author(s) : YUENCUE H., YILDIRIM O. T., KAKAC S.

Type of article: Article

Summary

A study of the stability of an electrically heated single channel, forced convection horizontal system was conducted by using R11 as the test fluid. Two major modes of oscillations, namely density-wave type (high frequency) and pressure-drop type (low frequency) oscillations have been observed. The steady-state operating characteristics and stable and unstable regions are determined as a function of heat flux, exit orifice diameter and mass flow rate. Different modes of oscillations and their characteristics have been investigated. The effect of the exit restriction on the system stability has also been studied. A mathematical model has been developed to predict the transient behaviour of boiling two-phase systems. The model is based on homogeneous flow assumption and thermodynamic equilibrium between the liquid and vapour phases. The transient characteristics of boiling two-phase flow horizontal system are obtained for various heat inputs, flow rates and exit orifice diameters by perturbing the governing equations around a steady state. Theoretical and experimental results have been compared.

Details

  • Original title: Two-phase flow instabilities in a horizontal single boiling channel.
  • Record ID : 1993-0811
  • Languages: English
  • Source: Appl. sci. Res. - vol. 48 - n. 1
  • Publication date: 1991

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