Experimental and numerical study on single-phase flow characteristics of natural circulation system with heated narrow rectangular channel under rolling motion condition

2017 ◽  
Vol 103 ◽  
pp. 97-113 ◽  
Author(s):  
Shengzhi Yu ◽  
Jianjun Wang ◽  
Ming Yan ◽  
Changqi Yan ◽  
Xiaxin Cao
Keyword(s):  
Single Phase ◽  
Numerical Study ◽  
Natural Circulation ◽  
Rectangular Channel ◽  
Flow Characteristics ◽  
Circulation System ◽  
Rolling Motion ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Motion Condition

Study on the Flow Characteristics for an Open Natural Circulation System

2014 ◽  
Author(s):  
Xueqing Guo ◽  
Zhongning Sun ◽  
Jianjun Wang ◽  
Jiqiang Su
Keyword(s):  
Mass Flow Rate ◽  
Flow Rate ◽  
Single Phase ◽  
Natural Circulation ◽  
Flow Characteristics ◽  
Circulation System ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase

An open natural circulation system applied to the passive containment cooling system is proposed for the large dry double-wall concrete containment after severe accidents. In order to investigate the operating behaviors of the open loop, a numerical code is developed to simulate the transient flow characteristics from the startup to the long-term operation. The results show that the open system may experience such four stages as startup process, quasi-steady single-phase flow, transition stage and quasi-steady two-phase flow. Flashing is the dominated factor in the last two flow phases. Additionally, the effects of some systematic parameters on the mass flow rate are analyzed in detail. Both increasing the condensation heat transfer coefficient and the containment temperature can enhance the flow effectively whichever stage the system operates in. But the the initial fluid temperature can only affect the duration of the single-phase flow but has little impact on the mass flow rate. Moreover, greater riser height can lead to bigger single-phase flow rate, but nearly has no influence on the long-term two-phase flow and the flashing region.

Numerical study on single-phase flow of natural circulation under ocean condition using coupled relap5 system code and fluent code

2019 ◽  
Vol 343 ◽  
pp. 138-150 ◽  
Author(s):  
Lie Wei ◽  
Liang-Ming Pan ◽  
Hui He ◽  
De-Wen Yuan ◽  
Jian-Jun Xu ◽  
...  
Keyword(s):  
Single Phase ◽  
Numerical Study ◽  
Natural Circulation ◽  
Phase Flow ◽  
Single Phase Flow

A numerical investigation on single-phase flow characteristics and frictional pressure drop in helical pipes

2020 ◽  
Vol 52 (4) ◽  
pp. 045505
Author(s):  
Pengxin Cheng ◽  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Numerical Investigation ◽  
Single Phase ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Frictional Pressure Drop

An Experimental Investigation of Gas-Liquid Heat Transfer in Rectangular Micro-Channels

2013 ◽  
Author(s):  
Sira Saisorn ◽  
Somchai Wongwises ◽  
Piyawat Kuaseng ◽  
Chompunut Nuibutr ◽  
Wattana Chanphan
Keyword(s):  
Heat Transfer ◽  
Single Phase ◽  
Flow Direction ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase ◽  
Camera System ◽  
Micro Channels ◽  
Flow Mechanisms

The investigations of heat transfer and fluid flow characteristics of non-boiling air-water flow in micro-channels are experimentally studied. The gas-liquid mixture from y-shape mixer is forced to flow in the 21 parallel rectangular microchannels with 40 mm long in the flow direction. Each channel has a width and a depth of 0.45 and 0.41 mm, respectively. Flow visualization is feasible by incorporating the stereozoom microscope into the camera system and different flow patterns are recorded. The experiments are performed under low superficial velocities. Two-phase heat transfer gives better results when compared with the single-phase flow. It is found from the experiment that heat transfer enhancement up to 53% is obtained over the single-phase flow. Also, the change in the configuration of the inlet plenum can result in the different two-phase flow mechanisms.

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