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Analysis of Rolling Effects on the Flow and Heat Transport Capacity of a Natural Circulation System
Pages: 414-418
Year: Issue:  2
Journal: Journal of Engineering Thermophysics

Keyword:  natural circulationrollingtheoretical analysisnumerical simulationCoriolis forcecentrifugal force;
Abstract: Natural circulation system is driven by gravity pressure difference caused by density difference.The value of the driving pressure head is small,which is affected by the positions of the cold and heat sources and the temperatures of the fluid.Therefore,ocean conditions,such as rolling,will largely influence the heat transport capacity of natural circulation systems.The flow rate and heat transport capacity were investigated using theoretical and numerical methods in the fixed coordinates.Theoretical analysis shows the mechanisms of how the rolling induced additional forces influence the flow rate and heat transport capacity of a natural circulation system.The governing ordinary differential equation for the mass flow rate of a natural circulation system under rolling condition is derived.In the numerical methods,additional force terms caused by rolling are added to the momentum equation.Numerical results of the flow rate fluctuation agree well with the theoretical results.The numerical results also show the decrement of the heat transport capacity of the system under rolling condition.
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