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http://dx.doi.org/10.5516/NET.02.2011.013

ESTIMATION OF LOCAL LIQUID FILM THICKNESS IN TWO-PHASE ANNULAR FLOW  

Lee, Bo-An (Department of Nuclear and Energy Engineering, Jeju National University)
Yun, Byong-Jo (Department of Mechanical Engineering, Pusan National University)
Kim, Kyung-Youn (Department of Electronic Engineering, Jeju National University)
Kim, Sin (Department of Nuclear and Energy Engineering, Jeju National University)
Publication Information
Nuclear Engineering and Technology / v.44, no.1, 2012 , pp. 71-78 More about this Journal
Abstract
In many semi-empirical analyses of flow boiling heat transfer, an annular flow is often assumed as a model flow and the local liquid film thickness is a key parameter in the analysis. This work considers a simple electrical conductance technique to estimate the local liquid film thickness in two-phase annular flows. In this approach, many electrodes are mounted flush with the inner wall of the pipe. Voltage differences between two neighboring electrodes for concentric annular flows with various liquid film thicknesses are obtained before the main experiments and logged in a look-up table. For an actual application in the annual flow, voltage differences of neighboring electrodes are measured and then corresponding local film thicknesses are determined by the interpolation of the look-up table. Even though the proposed technique is quite simple and straightforward, the numerical and static phantom experiments support its usefulness.
Keywords
Liquid Film Thickness; Annular Flow; Electrical Conductance;
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1 Y. Saito, K. Mishima, Y. Tobita, T. Suzuki and M. Matsubayashi, "Measurements of Liquid-Metal Two- Phase Flow by Using Neutron Radiography and Electrical Conductivity Probe," Exp. Thermal Fluid Sci., 29, 323-330 (2005).   DOI   ScienceOn
2 M.W.E. Coney, "The Theory and Application of Conductance Probes for the Measurement of Liquid Film Thickness in Two-Phase Flow," J. Phys. E: Scientific Instrum., 6, 903-910 (1973).   DOI   ScienceOn
3 T. Fukano, "Measurement of Time Varying Thickness of Liquid Film Flowing with High Speed Gas Flow by a Constant Electric Current Method," Nucl. Eng. Des., 184, 363-377 (1998).   DOI   ScienceOn
4 S. Saitoh, H. Daiguji and H. Hihara H, "Correlation for Boiling Heat Transfer of R-134a in Horizontal Tubes Including Effect of Tube Diameter," Int. J. Heat Mass Transfer, 50, 5215-5225 (2007).   DOI   ScienceOn
5 R. Revellin and J.R. Thome, "A Theoretical Model for the Prediction of the Critical Heat Flux," Int. J. Heat Mass Transfer, 51, 1216-1225 (2008).   DOI   ScienceOn
6 C.B. Tibirica, F.J. do Nascimento and G. Ribatski "Film Thickness Measurement Techniques Applied to Micro- Scale Two-Phase Flow Systems," Exp. Therm. Fluid Sci., 34, 463-473 (2010).   DOI   ScienceOn
7 D.S. Holder, Electrical Impedance Tomography: Method, History and Applications, IOP Publishing Ltd, Bristol and Philadelphia (2005).
8 G. Conte, "Film Thickness Variation about a T-Junction," Int. J. Multiphase Flow, 29, 305-328 (2003).   DOI   ScienceOn
9 G. Geraci, B.J. Azzopardi, and H.R.E. van Maanen, "Effect of Inclination on Circumferential Film Thickness Variation in Annular Gas/Liquid Flow," Chem. Eng. Sci. 62, 3032-3042 (2007).   DOI   ScienceOn
10 S. Liu, J. Li and Q. Chen, "Visualization of Flow Pattern in Thermosyphon by ECT," Flow Meas. Instrum., 18, 216-222 (2007).   DOI   ScienceOn
11 D. Schubring, A.C. Ashwood, T.A. Shedd and E.T. Hurlburt, "Planar Laser-Induced Fluorescence (PLIF) Measurements of Liquid Film Thickness in Annular Flow Part I: Methods and Data," Int. J. Multiphase Flow, 36, 815-824 (2010).   DOI   ScienceOn
12 J.E.R. Coney, E.A.M. El-Shafei and C.G.W. Sheppard, "A Dual Laser Beam Method for Wavy Film Thickness Measurement," Optics Lasers Eng., 11, 1-14 (1989).   DOI   ScienceOn
13 T. Ursenbacher, L. Wojtan and J.R. Thome, "Interfacial Measurements in Stratified Types of Flow. Part I: New Optical Measurement Technique and Dry Angle Measurements," Int. J. Multiphase Flow, 30, 107-124 (2004).   DOI   ScienceOn
14 S.C.M. Yu, C.P. Tso and R. Liew, "Analysis of Thin Film Thickness Determination in Two-phase Flow Using a Multifiber Optical Sensor," Appl. Math. Modelling, 20, 540-548 (1996).   DOI   ScienceOn
15 Q. Lu, N.V. Suryanarayana and C. Christodoulu, "Film Thickness Measurement with an Ultrasonic Transducer," Exp. Thermal Fluid Sci., 7, 354-361 (1993).   DOI   ScienceOn
16 P.C. Pedersen, Z. Cakareski and J.C. Hermanson, "Ultrasonic Monitoring of Film Condensation for Applications in Reduced Gravity," Ultrasonics, 38, 486-490 (2000).   DOI   ScienceOn
17 P. Stahl and P.R. Rohr, "On the Accuracy of Void Fraction Measurements by Single-Beam Gamma-Densitometry for Gas-Liquid Two-Phase Flows in Pipes," Exp. Thermal Fluid Sci., 28, 533-544 (2004).   DOI   ScienceOn