Begell House Inc.
Multiphase Science and Technology
MST
0276-1459
7
1-4
1993
Preface
v-vi
10.1615/MultScienTechn.v7.i1-4.10
REVIEW OF POST-DRYOUT HEAT TRANSFER IN DISPERSED TWO PHASE FLOW
1-37
10.1615/MultScienTechn.v7.i1-4.20
John C.
Chen
Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, USA
G.
Costigan
Department of Engineering Sciences, Oxford University, Parks Road, Oxford, UK
Work on post-dryout heat transfer is reviewed, starting with a description of the early experiments and simple equilibrium correlations. Non-equilibrium processes are described and experimental measurements of non-equilibrium flows and the prediction of heat transfer to such flows are discussed.
QUENCHING PHENOMENA
39-185
10.1615/MultScienTechn.v7.i1-4.30
Ralph A.
Nelson
Applied Physics Division, Los Alamos National Laboratory, P.O. Box 1663, MS F661, Los Alamos, New Mexico 87545, USA
K. O.
Pasemehmetoglu
Los Alamos National Laboratory, New Mexico, 87545 USA
This contribution reviews experimental and analytical studies relating to quenching phenomena. The main analytical approaches are to use transient conduction models quasi-steady-state quenching models and specific models for the given local conditions.
POST CHF EFFECTS OF SPACER GRIDS AND
185-269
10.1615/MultScienTechn.v7.i1-4.40
L. E.
Hochreiter
Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
M. J.
Loftus
Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
F. J.
Erbacher
Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
P.
Ihle
Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
K.
Rust
Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA
The state-of-the-art experimental and analytical work on post CHF effects of spacer grids and flow blockage in rod bundles is reviewed and summarized from the point of view of basic heat transfer effects and mechanisms. A perspective is given on what future work is needed to help validate state-of-the-art post CHF grid and blockage heat transfer models.
FLOW PHENOMENA IN POST-DRYOUT HEAT TRANSFER
271-325
10.1615/MultScienTechn.v7.i1-4.50
Mamoru
Ishii
Therma-Hydraulics and Reactor Safety Laboratory, School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA
This contribution describes detailed work on flow phenomena (including jet breakup and droplet formation) in post-dryout conditions in core-annular flow.
A REVIEW OF INVERTED ANNULAR AND LOW QUALITY FILM BOILING
327-365
10.1615/MultScienTechn.v7.i1-4.60
D. C.
Groeneveld
Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
This paper presents a review of the published information on low-quality and subcooled film boiling. In particular, the review focuses on the heat transfer mechanism in the inverted annular and slug flow regimes, and the minimum film boiling temperature. It was found that data for these modes of film boiling are scarce, especially data with water as the test fluid. The parametric trends of pressure, mass flux, quality, heat flux and axial location are discussed.
Analytical and empirical heat transfer prediction methods for inverted annular and slug flow film boiling have been tabulated. It was found that for low flows (i.e. less than 200kg−2·s−1) and saturated conditions, the pool film boiling equations result in reasonably accurate predictions. For higher flows and subcooled conditions, no single reliable prediction method is yet available.
AN EXPERIMENTAL STUDY OF POST-CHF HEAT TRANSFER IN A 3×3 ROD BUNDLE
367-421
10.1615/MultScienTechn.v7.i1-4.70
Kemal
Tuzla
Lehigh University, Department of Chemical and Biomolecular Engineering, 111 Research Drive, Room # B-323, Bethlehem PA 18015
C.
Unal
Lehigh University, P C Rossin College of Engineering and Applied Science, 19 Memorial Drive West, Bethlehem, PA, USA
John C.
Chen
Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, USA
This contribution describes post-CHF heat transfer experiments in a 3×3 rod bundle. The objective of these experiments was to obtain measurements of thermodynamic non-equilibrium in the post-CHF regime and to characterize its effects on two-phase heat transfer.
The nine rod test bundle incorporated a heated shroud to simulate the operating characteristics of a large rod bundle. A special 'hot patch' technique was developed and used successfully to achieve steady-state post-CHF conditions in rod bundle. Special steam temperature probes, developed earlier for tests in single tubes, were modified for use in the rod bundle. Each test provided measurements of system pressure, coolant flow rate, wall heat flux, wall temperatures, two-phase equilibrium qualities, and vapour superheat temperatures.
Experiments were conducted in three different modes: a) steady-state experiments with fixed-CHF location, b) reflood experiments with slowly advancing-CHF locations, c) boil-off experiments with retreating-CHF locations. A total of 468 data points were generated from 144 experimental runs in the following range of conditions.
Coolant mass flux 0.1 to 26 kg/m2s
Inlet quality 40°C subcooled to 0.40
Pressure 105 to 120 kPa
Heat flux 5 to 43 kW/m2