Experimental Frequency Response Characteristics for Diabatic Two-Phase Flow in a Vertical Monotube Vapor Generator

[+] Author and Article Information
F. W. Paul

Mechanical Engineering Department, Carnegie-Mellon University, Pittsburgh, Pa.

K. J. Riedle

Siemens, Forschung Szentrum, RT 51, 852 Erlangen, West Germany

J. Heat Transfer 96(4), 504-510 (Nov 01, 1974) (7 pages) doi:10.1115/1.3450236 History: Received June 12, 1974; Online August 11, 2010


This paper presents experimental data on the dynamic behavior of diabatic two-phase flow in a vertical tube with Refrigerant-11 as the working fluid. A detailed description is included of the experimental test facility as well as the instrumentation used for monitoring the variables of pressure, flow, heat flux, and void fraction. Experimental data are presented in frequency response form for inlet impedance (ΔP1 /ΔW1 ) and exit void fraction (Δα3 /ΔW1 ) at constant heat flux over a frequency range of 0.01 to 10.0 Hz. The data cover inlet subcooling conditions of 14°F and 79°F and two heat flux levels. The experimental results show that the inlet impedance characteristics have fluctuations in amplitude and phase lag with frequency which lead to resonant peaks in the overall frequency response behavior. Exit void fraction characteristics show similar resonant behavior with large phase lag at frequencies above 1 Hz.

Copyright © 1974 by ASME
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