Research Papers: Multiphase Flows

Flow Regime Identification Under Adiabatic Upward Two-Phase Flow in a Vertical Rod Bundle Geometry

[+] Author and Article Information
Sidharth Paranjape, Shao-Wen Chen, Takashi Hibiki

Mamoru Ishii1

School of Nuclear Engineering,  Purdue University, 400 Central Dr., West Lafayette, IN 47907-2017ishii@purdue.edu


Corresponding author.

J. Fluids Eng 133(9), 091302 (Sep 12, 2011) (8 pages) doi:10.1115/1.4004836 History: Received February 10, 2011; Accepted August 07, 2011; Published September 12, 2011; Online September 12, 2011

Flow regime maps were obtained for adiabatic air-water two-phase flow through a flow channel with 8 × 8 rod bundle, which simulated a typical rod bundle in a boiling water reactor. Impedance void meters were used to measure the area averaged void fraction at various axial locations in the flow channel. The Cumulative Probability Distribution Functions of the signals from the impedance meters were utilized along with self organizing neural network methodology to identify the flow regimes. The flow regimes were identified at five axial locations in the channel in order to understand the development of the flow regimes in axial direction. The experimental flow regime transition boundaries for bubbly to cap-bubbly and part of the cap-turbulent to churn-turbulent agreed with the theoretical boundaries of bubbly to slug and slug to churn-turbulent in round pipes. In addition, the two impedance void meters located across a spacer grid, revealed the nature of change in the flow regime across the spacer grid.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic diagram of the experimental test facility

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Figure 2

Cross-sectional view of the rod bundle test section at a measurement port

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Figure 3

Schematic diagram of air-water mixture injection

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Figure 4

Present test matrix and theoretical/experimental transition boundaries obtained for round pipes [9] and large diameter pipes (102 mm and 152 mm ID) [10]

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Figure 5

Schematic figures of flow regime identification process

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Figure 6

Flow visualization in various flow regimes at z/DH  = 140

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Figure 7

Drift-flux plot and empirical correlation for the present data in rod bundle geometry

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Figure 8

Comparison of rod bundle flow regime map at z/DH  = 200 with Mishima-Ishii’s theoretical flow regime map for round pipes [9]

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Figure 9

Comparison of rod bundle flow regime map at z/DH  = 200 with Smith’s experimental flow regime map for large diameter pipes [10]

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Figure 10

Experimental flow regime maps across the spacer grid at z/DH  = 121, with upstream port at z/DH  = 116 and downstream port at z/DH  = 124

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Figure 11

Flow regime transition boundaries at various axial locations



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