Investigations on single-phase natural circulation loop dynamics. Part 2: Role of wall constitutive laws

被引：9
作者：
Naveen, Kumar [1 ]
Iyer, Kannan N. [2 ]
Doshi, J. B. [2 ]
Vijayan, P. K. [1 ]
机构：
[1] Bhabha Atom Res Ctr, Reactor Engn Div, Bombay 400085, Maharashtra, India
[2] Indian Inst Technol, Dept Mech Engn, Mumbai 400076, Maharashtra, India
来源：
PROGRESS IN NUCLEAR ENERGY | 2014年 / 75卷
关键词：
Natural circulation; Single-phase; Wall constitutive laws; Friction factor; CONVECTION HEAT-TRANSFER; STABILITY CHARACTERISTICS; MIXED CONVECTION; RECTANGULAR LOOP; FRICTION-FACTOR; STEADY-STATE; FLUID-FLOW; BEHAVIOR; LAMINAR; TRANSIENT;
D O I：
10.1016/j.pnucene.2014.04.011
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Unlike forced circulation systems, natural circulation systems need to be started from the state of zero flow. Literature study shows that under low flow conditions, the velocity field near the wall is significantly modified by secondary convection currents particularly during diabatic conditions. In view of this, the applicability of conventional forced convection wall constitutive laws to these systems has been investigated both theoretically and experimentally. First the applicability of conventional wall constitutive laws derived from steady state forced convection experiments is examined. Next, the results of experimental investigations carried out in a rectangular natural circulation loop are presented. Finally, a new correlation for wall friction factor is proposed for flow in horizontal pipes under diabatic conditions. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：105 / 116
页数：12
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