Research of hydrodynamics and heat exchange motion in the pipes of evaporators with natural circulation

2020 ◽  
Vol 26 (4) ◽  
pp. 149-153
Author(s):  
Y. Porzhezinsky
Keyword(s):  
Heat Exchange ◽  
Natural Circulation

scholarly journals CFD Analysis of the Passive Decay Heat Removal System of an LBE-Cooled Fast Reactor

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Jiarun Mao ◽  
Lei Song ◽  
Yuhao Liu ◽  
Jiming Lin ◽  
Shanfang Huang ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Fast Reactor ◽  
Natural Circulation ◽  
Heat Removal ◽  
Engineering Project ◽  
Decay Heat ◽  
The Core ◽  
Main Vessel ◽  
Heat Removal System ◽  
Removal System

This paper presents capacity of the passive decay heat removal system (DHRS) operated under the natural circulation conditions to remove decay heat inside the main vessel of the Lead-bismuth eutectic cooled Fast Reactor (LFR). The motivation of this research is to improve the inherent safety of the LFR based on the China Accelerator Driven System (ADS) engineering project. Usually the plant is damaged due to the failure of the main pumps and the main heat exchangers under the Station Blackout (SBO). To prevent this accident, we proposed the DHRS based on the diathermic oil cooling for the LFR. The behavior of the DHRS and the plant was simulated using the CFD code STAR CCM+ using LFR with DHRS. The purpose of this analysis is to evaluate the heat exchange capacity of the DHRS and is to provide the reference for structural improvement and experimental design. The results show that the stable natural circulations are established in both the main vessel and the DHRS. During the decay process, the heat exchange power is above the core decay heat power. In addition, in-core decay heat and heat storage inside the main vessel are efficiently removed. All the thermal-hydraulics parameters are within a safe range. Moreover, the highest temperature occurs at the upper surface of the core. A swirl occurs at the corner of the lateral core surface and some improvements should be considered. And the natural circulation driving force can be further increased by reducing the loop resistance or increasing the natural circulation height based on the present design scenario to enhance the heat exchange effect.

scholarly journals Feasibility of Natural Circulation Heat Transport in the ENHS

2002 ◽  
Author(s):  
James J. Sienicki
Keyword(s):  
Heat Exchange ◽  
Natural Circulation ◽  
Gas Injection ◽  
Wall Friction ◽  
Steam Generators ◽  
Primary Coolant ◽  
The Core ◽  
Nuclear Heat ◽  
System Temperature ◽  
Coolant System

An analysis has been carried out of natural circulation thermal hydraulics in both the primary and intermediate circuits of the Encapsulated Nuclear Heat Source (ENHS). It is established that natural circulation enhanced by gas injection into the primary coolant above the core, or the intermediate coolant above the heat exchange zone, is effective in transporting the nominal core power to the steam generators without the attainment of excessive system temperatures. Uncertainties in thermophysical properties and wall friction have a relatively small effect upon the calculated best estimate primary and intermediate coolant system temperature rises.

Some Specific Features of the Flow and Heat Exchange of Dissociated Gas in a Circular Tube

1998 ◽  
Vol 29 (4-5) ◽  
pp. 294-299
Author(s):  
A. A. Vasil'yev ◽  
V. F. Vishnyak ◽  
I. I. Didenko ◽  
V. N. Panchenko
Keyword(s):  
Heat Exchange ◽  
Circular Tube
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