ライブラリ登録: Guest
International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

NUMERICAL STUDY OF MACROSCOPIC FLOW INSTABILITIES ASSOCIATED WITH NATURAL CIRCULATION LOOPS UNDER SUPERCRITICAL CONDITIONS

page 12
DOI: 10.1615/IHTC13.p6.240
Get accessGet access

要約

A computational model has been developed at UW Madison which provides a simulation tool for the steady-state and transient analysis of one dimensional natural circulation flow of a supercritical fluid, and was applied for loop stability analysis. Several modifications and improvements were incorporated from past numerical schemes (Chatoorgoon, 1986) before applying it to investigate the transient behavior of two experimental loops, namely, the supercritical water loop (SCW) at UW-Madison (Jain et. al, 2002) and the supercritical carbon-dioxide (SCCO2) loop at Argonne National Laboratories (Lomperski, 2003). Two types of boundary conditions were studied which included, a fixed heater inlet pressure and temperature boundary condition, which corresponds to the presence of a reservoir in the flow loop; the second boundary condition being the assumption of no reservoir in the system allowing the inlet temperature and pressure to vary with respect to time. The model predicted development of instabilities for a system with a large reservoir for both SCW and SCCO2 loop in agreement with some previous work. The experiments conducted at SCCO2 loop with a finite reservoir conversely exhibited stable behavior. The model with a closed loop boundary condition with no reservoir present, however, displayed instabilities that diminished in magnitude with the numerical time step used in the calculations. In order to distinguish between the numerical effects and physical processes, a linear stability approach was undertaken to compare to the transient model.

Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集 価格及び購読のポリシー Begell House 連絡先 Language English 中文 Русский Português German French Spain