An experimental investigation was conducted to study the flash boiling process and the influence of the exiting restriction (orifice) size on the mass flow during flash boiling of HCFC-22 in a glass pressure vessel. An apparatus was built and a combination of tests were run with three interchangeable exiting orifices (1.59, 3.18, and 5.56 mm diameters). The flashed vapor was vented from a 1110-mL vessel to a large “semi-infinite” tank initially set at 120 kPa. Calculations revealed that the refrigerant flow exiting the vessel was choked, depending on the orifice size. Smaller orifices were choked longer, had slower depressurization rates, and reduced mass flow rates. The depressurization rates were greater for tests large offices which enabled the liquid to become more highly superheated, up to 41°C for one test case, and ultimately vaporize more refrigerant.
Issue Section:
Technical Papers
Topics:
Boiling,
Flow (Dynamics),
Vessels,
Orifices,
Refrigerants,
Glass,
Pressure vessels,
Superheating,
Vapors
1.
Carey, V. P., 1992, Liquid-Vapor Phase Change Phenomena, Hemisphere Publishing Corporation, Washington, DC.
2.
Clegg
G. T.
Padakis
G.
1986
, “Rates of Evaporation Accompanying the Depressurization of a Pool of Saturated Freon-11
,” Chemical Engineering
, Vol. 41
, No. 12
, pp. 3037
–3043
.3.
Collier, J. G., 1981, Convective Boiling and Condensation, McGraw-Hill Book Company, 2nd Edition, New York, NY.
4.
Edwards
A. R.
O’Brien
T. P.
1970
, “Studies of Phenomena Connected With the Depressurization of Water Reactors
,” The British Nuclear Energy Society
, Vol. 9
, No. 2
, pp. 125
–135
.5.
Fauske
H. K.
1988
, “Emergency Relief System Design for Reactive and Non-Reactive Systems: Extension of the DIERS Methodology
,” Plant Operations Progress
, Vol. 7
, No. 3
, pp. 153
–158
.6.
Fauske
H. K.
Epstein
M.
Grolmes
M. A.
Leung
J. C.
1986
, “Emergency Relief Vent Sizing for Fire Emergencies Involving Liquid-Filled Atmospheric Storage Vessels
,” Plant Operations Progress
, Vol. 5
, No. 4
, pp. 205
–208
.7.
Fauske
H. K.
1985
, “Flashing Flows or: Some Practical Guidelines for Emergency Releases
,” Plant/Operations Progress
, Vol. 4
, No. 3
, pp. 132
–134
.8.
Fauske, H. K., Grolmes, M. A., and Leung, J. C., 1984, “Multi-Phase Flow Considerations in Sizing Emergency Relief Systems for Runaway Chemical Reactions,” Multi-Phase Flow and Heat Transfer III Part B: Applications, pp. 899–907.
9.
First
K. E.
Huff
J. E.
1989
, “Design Chart for Two-Phase Flashing Flow in Emergency Pressure Relief Systems
,” Plant Operations Progress
, Vol. 8
, No. 1
, pp. 40
–54
.10.
Grolmes, M. A., and Fauske, H. K., 1984, “An Evaluation of Incomplete Vapor Phase Separation in Freon-12 Top Vented Depressurization Experiments,” Multi-Phase Flow and Heat Transfer III, Part A: Fundamentals, pp. 539–548.
11.
Guhler, M., Hannemann, R. J., and Sallet, D. W., 1979, “Unsteady Two-Phase Slowdown of a Flashing Liquid From a Finite Reservoir,” Two-Phase Momentum, Heat and Mass Transfer in Chemical, Process, and Energy Engineering Systems, pp. 781–795.
12.
Hanaoka
Y.
Maeno
K.
Zhao
L.
Heymann
G.
1990
, “A Study of Liquid Flashing Phenomenon Under Rapid Depressurization
,” JSME International Journal
, Ser. II, Vol. 33
, No. 2
, pp. 276
–282
.13.
Huff
J. E.
1982
, “Emergency Venting Requirements
,” Plant Operations Progress
, Vol. 1
, No. 4
, pp. 211
–223
.14.
Huff
J. E.
1984
, “Emergency Venting Requirements for Gassy Reactions From Closed System Tests
,” Plant Operations Progress
, Vol. 3
, No. 1
, pp. 50
–59
.15.
Huff
I. E.
1985
, “Multiphase Flashing in Pressure Relief Systems
,” Plant/Operations Progress
, Vol. 4
, No. 4
, pp. 191
–199
.16.
Krakow
K.
Lin
S.
1990
, “Secondary Heat Transfer in Heat Pumps
,” Transactions American Society of Heating, Refrigerating, and Air Conditioning Engineers
, Vol. 96
, No. 1
, pp. 312
–323
.17.
Leung
J. C.
Fauske
H. K.
1987
, “Runawasy System Characterization and Vent Sizing Based on DIERS Methodology
,” Plant Operations Progress
, Vol. 6
, No. 2
, pp. 77
–83
.18.
Lior
N.
1986
, “Formulas for Calculating the Approach to Equilibrium in Open Channel Flash Evaporators for Saline Water
,” Desalination
, Vol. 60
, pp. 223
–249
.19.
Maeno
K.
Kosugi
S.
Hanaoka
Y.
1987
, “A Study of R-113 Pool Flashing Under Rapid Depressurization
,” Transactions JSME
, Vol. 53
, No. 485B
, pp. 193
–197
.20.
Mayinger
F.
1982
, “The State of Knowledge of Thermohydraulic Pressure Release Phenomena
,” German Chemical Engineering
, Vol. 5
, pp. 297
–305
.21.
Mayinger
F.
1988
, “Two-Phase Flow Phenomena With Depressurization—Consequences for the Design and Layout of Safety and Pressure Relief Valves
,” Chemical Engineering and Processing
, Vol. 23
, No. 1
, pp. 1
–11
.22.
Nakamura
S.
Matushima
T.
Anzai
S.
1984
, “Transient Characteristics of Flashing Phenomena of Saturated Water in Vessels and Their Method of Analysis
,” Heat Transfer—Japanese Research
, Vol. 13
, No. 4
, pp. 1
–18
.23.
O’Neal
D.
Peterson
K.
Anand
N.
Schliesing
J.
1989
, “Refrigeration System Dynamics During the Reverse Cycle Defrost
,” Transactions American Society of Heating, Refrigerating, and Air Conditioning Engineers
, Vol. 95
, No. 2
, pp. 689
–698
.24.
Pastushenko
B.
1988
, “Temperature Distribution Measured in a Vertical Evaporation Chamber of a Flash-Desalination Unit
,” Heat Transfer—Soviet Research
, Vol. 20
, No. 4
, pp. 517
–522
.25.
Peterson
R. J.
Grewal
S. S.
El-Wakil
M. M.
1984
, “Investigations of Liquid Flashing and Evaporation due to Sudden Depressurization
,” International Journal of Heat and Mass Transfer
, Vol. 27
, No. 2
, pp. 301
–310
.26.
Swift
I.
Fauske
H. K.
Grolmes
M. A.
1983
, “Emergency Relief Systems for Runaway Reactions
,” Plant Operations Progress
, Vol. 2
, No. 2
, pp. 116
–120
.
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