Pitch-to-diameter effect on two-phase flow across an in-line tube bundle

Journal Article · Tue May 01 00:00:00 EDT 1990 · A.I.Ch.E. Journal (American Institute of Chemical Engineers); (United States)

DOI:https://doi.org/10.1002/aic.690360513· OSTI ID:5540447

Dowlati, R; Kawaji, M ^[1]; Chan, M M.C. ^[2]

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1. Dept. of Chemical Engineering and Applied Chemistry, Univ. of Toronto, Toronto, Ontario M5S 1A4 (CA)
2. Ontario Hydro Research Div., Ontario Hydro Toronto, Ontario (CA)

This paper reports on void fraction and friction pressure drop measurements that were made for an adiabatic, vertical two-phase flow of air-water across two horizontal, in-line, 5 {times} 20 rod bundles, one with a pitch-to-diameter ratio, P/D, of 1.3, the other 1.75. For both bundles the average void fraction showed a strong mass velocity effect and values were significantly less than those predicted by a homogeneous flow model. All void fraction data were found to be well correlated, with no P/D effect, using the dimensionless gas velocity, j*{sub g}. The two-phase friction multiplier data exhibited a strong effect of P/D and mass velocity, however, the data for both bundles could be well correlated with the Martinelli parameter for G {gt} 200 kg/m{sup 2}s. The correlations developed for void fraction and two-phase friction multiplier were successfully tested in predicting the total pressure drop in boiling freon experiments.

• OSTI ID: 5540447
• Journal Information: A.I.Ch.E. Journal (American Institute of Chemical Engineers); (United States), Vol. 36:5; ISSN 0001-1541
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
22 GENERAL STUDIES OF NUCLEAR REACTORS
PIPELINES
PRESSURE DROP
REACTOR COMPONENTS
FLOW MODELS
ROD BUNDLES
TWO-PHASE FLOW
VOID FRACTION
EXPERIMENTAL DATA
FREONS
FRICTION
MASS TRANSFER
NUCLEATE BOILING
PHASE VELOCITY
REACTOR ACCIDENTS
REACTOR COOLING SYSTEMS
REACTOR SAFETY EXPERIMENTS
ACCIDENTS
BOILING
COOLING SYSTEMS
DATA
FLUID FLOW
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MATHEMATICAL MODELS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
VELOCITY
420400* - Engineering- Heat Transfer & Fluid Flow
220200 - Nuclear Reactor Technology- Components & Accessories
220900 - Nuclear Reactor Technology- Reactor Safety