TED-AJ03-390 UNSTABLE BEHAVIOR OF A NATURAL CIRCULATION LOOP WITH END HEAT EXCHANGERS

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概要

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• In a natural circulation loop (NCL) the fluid circulation is developed by its density difference, which in turn is caused due to the difference in temperature in different parts of the loop. These loops do not require any auxiliary power and can be designed as highly reliable self-contained systems. They find wide applications in varied engineering systems, ranging from low capacity boilers and micro-coolers to large nuclear power plants and space heat sinks. As the flow rate through a NCL is not known a priory, its design posses a challenging problem of coupled momentum and energy transfer. Considerable research interests have been shown for the analysis of steady state performance and stability behavior of natural circulation loops. In most of the investigations loops of toroidal geometry have been considered. Heat exchange has been assumed to take place either under constant heat flux or constant wall temperature. [figure] However, a number of practical systems deviate from these idealizations. Rectangular loops exchanging heat with flowing streams of single phase fluid are often designed. Stability behavior of such loops has not been studied in details. In the present work the stability analysis of a vertical rectangular loop shown in "Fig. A-1" has been considered. For analyzing the behaviour of the loop, mass, momentum conservation equations for the coupling fluid stream and energy conservation equations for the three fluid streams have been written in an one-dimensional coordinate system for the transient state. A finite element programme has been developed for solving the set of coupled equations under transient state. For stability analysis the same programme has been used and finite perturbation has been given to the steady state value of the coupling fluid flow rate. Three examples have been taken to demonstrate the stable, unstable and neutrally stable state of the loop. The "Fig. A-2" demonstrate the variation of coupling fluid flow rate under neutrally stable condition.[figure]

• 一般社団法人日本機械学会の論文

著者

• DAS P.

  Department of Neurology, Baylor College of Medicine

• Rao N.

  Department Of Mathematics Andhra University

• Maiti B.

  Department Of Mechanical Engineering Indian Institute Of Technology

• Das P.

  Department Of Mechanical Engineering Indian Institute Of Technology

• Rao N.

  Department Of Mechanical Engineering Indian Institute Of Technology

• Rao N.

  Department Of Inorganic And Analytical Chemistry Andhra University

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