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Transient behavior of single‐phase natural‐circulation loop systems
Author(s) -
Alstad C. D.,
Isbin H. S.,
Amundson N. R.,
Silvers J. P.
Publication year - 1955
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690010407
Subject(s) - natural circulation , piping , transient (computer programming) , mechanics , control theory (sociology) , computation , transient state , loop (graph theory) , steady state (chemistry) , engineering , simulation , mathematics , mechanical engineering , computer science , physics , algorithm , chemistry , control (management) , electrical engineering , combinatorics , artificial intelligence , operating system
A useful method is reported for calculating temperatures and rates of flow in the unsteady‐state operation of natural‐circulation loops in single phase. A one‐dimensional mathematical model is used with the assumptions that (1) at any instant the volumetric rate of flow is constant around the loop and (2) steady‐state friction factors can be applied in transient operations. The loop, consisting of a heat source, heat sink, hot leg, cold leg, and connecting piping, is divided into a number of finite increments. The transient behavior is calculated by the iterative application of the finite‐difference momentum and energy balances. Numerical computations made for several cases of transient operations were carried out with the aid of the Standard Eastern Automatic Computer (SEAC). Comparisons of predicted with actual performances were checked by use of two experimental loops employing water and found satisfactory.