Scaling analyses for the open flashing-driven natural circulation system

Guo, Xueqing; Sun, Zhongning; Wang, Jianjun; Sui, Yu

doi:10.1016/j.nucengdes.2017.08.024

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…An open natural circulation cycle was proposed in Ref. [20] to design a passive containment cooling system. A numerical code was developed to simulate the process.…”

Section: Literature Surveymentioning

confidence: 99%

Analysis of thermal and flow phenomena in natural circulation boiler evaporator

Grądziel¹

2019

Energy

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An original in-house mathematical model enabling the analysis of thermal and flow phenomena occurring in the evaporator of a natural circulation boiler is proposed herein. It is a distributed parameter model based on an original approach to the problem of solving the equations describing the principles of mass, momentum, and energy conservation. The equations are solved using the method of lines. Space derivatives are written on the left side of the equations and time derivatives are approximated using difference quotients. This system of ordinary differential equations is solved using the RungeeKutta method. Such an approach is characterised by high stability and accurate calculations. The developed model is applied to obtain the fluid mass flow, pressure, and enthalpy (temperature) values in the boiler evaporator. It can be applied in single-and two-phase flows. This paper presents the original results of the testing of the flow phenomena occurring in the boiler evaporator in steady and transient states. Steady-state tests were performed for different boiler loads. The operating multiplicity of the fluid circulation in the boiler evaporator was determined. A flow meter was installed on a downcomer, which enabled a comparison between the measured values of the water mass flow and those calculated using the developed model. The presented model can also be applied for the analysis of the boiler evaporator operation at an abrupt increase or decrease in pressure in emergency situations. Such occurrences may cause water stagnation in the evaporator tubes; therefore, the tubes may crack.

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“…An open natural circulation cycle was proposed in Ref. [20] to design a passive containment cooling system. A numerical code was developed to simulate the process.…”

Section: Literature Surveymentioning

confidence: 99%

Analysis of thermal and flow phenomena in natural circulation boiler evaporator

Grądziel¹

2019

Energy

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“…The riser, connecting the outlet of the heater and the inlet of cooler, is adopted to improve the flow rate under two-phase conditions. Such NCSs are commonly adopted in the NPPs, such as Novel Modular Reactors (NMRs) (Singh et al, 2017), Passive Containment Cooling Systems (PCCSs) (Guo et al, 2017;Hou et al, 2017), and others (Park et al, 2007;Chen et al, 2013;Jiang et al, 2018). Sometimes the heat source is horizontally placed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Sun

Zhang

et al. 2020

Front. Energy Res.

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Direct contact condensation (DCC) as a complex thermal-hydraulic phenomenon has been the subject of a great deal of research under forced flow conditions. It is an interesting challenge to study the phenomenon in a natural circulation system (NCS). In this paper, the flow behaviors along with DCC phenomena were experimentally investigated by a visualization method in an NCS at low pressure. Moreover, the influence of initial parameters including heat flux, inlet temperature and resistance of the heated section on the NCS was analyzed in detail. The experimental results revealed that two types of DCC phenomena were found in the NCS. When Type I DCC occurs, the interface wave will be formed due to the hydraulic jump caused by the reverse flow of subcooled water. The interface wave easily contributes to the occurrence of Type II DCC due to the Kelvin-Helmholtz instability. In addition, the NCS tends to be more unstable with the increase in the heat flux or the inlet resistance. The influence of inlet temperature on the flow rate should comprehensively consider the changes of outlet parameters and subcooled degree of the steam and the subcooled water.

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Experimental study on flow modes and transient characteristics in low-pressure equal-height-difference natural circulation system

Sun

Deng

et al. 2021

Annals of Nuclear Energy

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Scaling analyses for the open flashing-driven natural circulation system

Cited by 5 publications

References 10 publications

Analysis of thermal and flow phenomena in natural circulation boiler evaporator

Analysis of thermal and flow phenomena in natural circulation boiler evaporator

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Experimental study on flow modes and transient characteristics in low-pressure equal-height-difference natural circulation system

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