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Title: A momentum source model for wire-wrapped rod bundles—Concept, validation, and application

Large uncertainties still exist in the treatment of wire-spacers and drag models for momentum transfer in current lumped parameter models. Here, to improve the hydraulic modeling of wire-wrap spacers in a rod bundle, a three-dimensional momentum source model (MSM) has been developed to model the anisotropic flow without the need to resolve the geometric details of the wire-wraps. The MSM is examined for 7-pin and 37-pin bundles steady-state simulations using the commercial CFD code STAR-CCM+. The calculated steady-state inter-subchannel cross flow velocities match very well in comparisons between bare bundles with the MSM applied and the wire-wrapped bundles with explicit geometry. The validity of the model is further verified by mesh and parameter sensitivity studies. Furthermore, the MSM is applied to a 61-pin EBR-II experimental subassembly for both steady state and PLOF transient simulations. Reasonably accurate predictions of temperature, pressure, and fluid flow velocities have been achieved using the MSM for both steady-state and transient conditions. Significant computing resources are saved with the MSM since it can be used on a much coarser computational mesh.
Authors:
 [1] ;  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
Publication Date:
Report Number(s):
ANL/NE/JA-73950
Journal ID: ISSN 0029-5493; 73950
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nuclear Engineering and Design
Additional Journal Information:
Journal Volume: 262; Journal Issue: C; Journal ID: ISSN 0029-5493
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; momentum source; cross-flow; wire-wrapped bundle
OSTI Identifier:
1429359

Hu, Rui, and Fanning, Thomas H. A momentum source model for wire-wrapped rod bundles—Concept, validation, and application. United States: N. p., Web. doi:10.1016/j.nucengdes.2013.04.026.
Hu, Rui, & Fanning, Thomas H. A momentum source model for wire-wrapped rod bundles—Concept, validation, and application. United States. doi:10.1016/j.nucengdes.2013.04.026.
Hu, Rui, and Fanning, Thomas H. 2013. "A momentum source model for wire-wrapped rod bundles—Concept, validation, and application". United States. doi:10.1016/j.nucengdes.2013.04.026. https://www.osti.gov/servlets/purl/1429359.
@article{osti_1429359,
title = {A momentum source model for wire-wrapped rod bundles—Concept, validation, and application},
author = {Hu, Rui and Fanning, Thomas H.},
abstractNote = {Large uncertainties still exist in the treatment of wire-spacers and drag models for momentum transfer in current lumped parameter models. Here, to improve the hydraulic modeling of wire-wrap spacers in a rod bundle, a three-dimensional momentum source model (MSM) has been developed to model the anisotropic flow without the need to resolve the geometric details of the wire-wraps. The MSM is examined for 7-pin and 37-pin bundles steady-state simulations using the commercial CFD code STAR-CCM+. The calculated steady-state inter-subchannel cross flow velocities match very well in comparisons between bare bundles with the MSM applied and the wire-wrapped bundles with explicit geometry. The validity of the model is further verified by mesh and parameter sensitivity studies. Furthermore, the MSM is applied to a 61-pin EBR-II experimental subassembly for both steady state and PLOF transient simulations. Reasonably accurate predictions of temperature, pressure, and fluid flow velocities have been achieved using the MSM for both steady-state and transient conditions. Significant computing resources are saved with the MSM since it can be used on a much coarser computational mesh.},
doi = {10.1016/j.nucengdes.2013.04.026},
journal = {Nuclear Engineering and Design},
number = C,
volume = 262,
place = {United States},
year = {2013},
month = {6}
}