Measurements of pressure drop, temperture, and average void fraction are presented for adiabatic, vertical-upwards, two-phase flow of Refrigerant 114 in a pipe. An experimental method has been developed according to which the evolution of flow states occurring in long pipes can be realized in a test section of limited length. The experiments cover the range of the flow from flashing to near choking. The measurements indicate existence of macroscopic thermodynamic equilibrium, except in the immediate neighborhood of flashing. Compressibility due to phase change is shown to play a very important role in the development of the flow. Three regions are recognized based on the measured energetics of the flow. Each region is dominated by potential energy changes, dissipation, and kinetic energy changes, respectively. The evolution of the flow is governed by hydrostatic effects in the initial region after flashing and by high, phase-change-induced kinetic energy increases far downstream as the flow approaches choking. In the intermediate region, viscous, inertial and gravitational effects play a role of comparable importance. The interfacial and wall shear forces have also been calculated from the measurements. The former dominate the initial regions of the flow, while the latter are strongest at high vapor contents.
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March 1994
Research Papers
An Experimental Investigation of Pure-Substance, Adiabatic Two-Phase Flow in a Vertical Pipe
D. E. Nikitopoulos,
D. E. Nikitopoulos
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803
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P. F. Maeder
P. F. Maeder
Division of Engineering, Brown University, Providence, RI 02912
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D. E. Nikitopoulos
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803
P. F. Maeder
Division of Engineering, Brown University, Providence, RI 02912
J. Energy Resour. Technol. Mar 1994, 116(1): 22-32 (11 pages)
Published Online: March 1, 1994
Article history
Received:
September 21, 1992
Revised:
September 14, 1993
Online:
April 16, 2008
Citation
Nikitopoulos, D. E., and Maeder, P. F. (March 1, 1994). "An Experimental Investigation of Pure-Substance, Adiabatic Two-Phase Flow in a Vertical Pipe." ASME. J. Energy Resour. Technol. March 1994; 116(1): 22–32. https://doi.org/10.1115/1.2906005
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