Comparison of heat transfer in natural and forced circulation under rolling motion

Kerntechnik ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. 82-87
Author(s):  
C. Wang ◽  
E. Shi ◽  
L. Sun ◽  
W. Chen
Keyword(s):  
Heat Transfer ◽  
Rolling Motion ◽  
Forced Circulation

Experimental study of single-phase forced circulation heat transfer in circular pipe under rolling motion

2013 ◽  
Vol 265 ◽  
pp. 348-355 ◽  
Author(s):  
Chang Wang ◽  
Puzhen Gao ◽  
Shaowu Wang ◽  
Xiaohui Li ◽  
Chengyue Fang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Single Phase ◽  
Circular Pipe ◽  
Rolling Motion ◽  
Forced Circulation

Comparison of heat transfer in natural and forced circulation under rolling motion

Kerntechnik ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. 82-87
Author(s):  
C. Wang ◽  
E. Shi ◽  
L. Sun ◽  
W. Chen
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Characteristic ◽  
Natural Circulation ◽  
Transfer Characteristic ◽  
Rolling Motion ◽  
Heat Transfer Characteristics ◽  
Forced Circulation ◽  
Average Heat ◽  
The Relationship ◽  
Circulation Condition

Abstract A comparative analysis of heat transfer characteristic in pulsating flow induced by rolling motion under natural circulation and forced circulation condition was performed. Variation of local and average heat transfer characteristics with rolling motion were also investigated. The results show that the natural circulation time-averaged heat transfer characteristic is enhanced by rolling motion. However, the variation of time-averaged heat transfer characteristic of forced circulation is not significant. In addition, the relationship between the relative pulsation amplitude of Reynolds number and Nusselt number does not present predominant difference in natural and forced circulation conditions.

Flow and Heat Transfer of Supercritical Co2 in a Vertical Tube Under Ocean Rolling Motion

2021 ◽  
Author(s):  
Dechao Liu ◽  
Shulei Li ◽  
Gongnan Xie ◽  
Youqian Chen
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Gas Turbines ◽  
Waste Heat ◽  
Static Condition ◽  
Vertical Tube ◽  
Rolling Motion ◽  
Flow And Heat Transfer ◽  
Maximum Improvement

Abstract In order to explore the fluid flow and heat transfer features of supercritical fluids used in Brayton cycle for waste-heat utilization of marine gas turbines, the effects of ocean rolling motion on thermo-fluidic characteristics of supercritical carbon dioxide (SCO2) in a circular tube are computationally investigated based on a verified turbulence model. It can be found that at a given rolling period, compared to that under static condition, the time-averaged heat transfer capacity is improved by 7.9%, but the onset of the heat transfer recovery is delayed so that the range of the heat transfer deterioration becomes widened. Under the action of the inertial forces, the heat exchange between cooler/denser and warmer/lighter fluids is enhanced, a secondary circulation formed at t/tc = 0.325 and the maximum improvement of section-averaged heat transfer coefficient is 71% at this time. For various periods, the variation trend of time-averaged heat transfer coefficient for SCO2 shows a parabolic, which is distinguishing from conventional fluids. A polarization phenomenon for instantaneous thermal performance can be observed under severe rolling. With rise of the layout height, the time-average heat transfer performance of tube increases monotonously, and the maximum increment is 10.64% in study range.

The effect of rolling motion on flow resistance and heat transfer in narrow rectangular channel under natural circulation

2020 ◽  
Vol 370 ◽  
pp. 110893
Author(s):  
Lie Wei ◽  
Hou-Jun Gong ◽  
Hui He ◽  
De-Wen Yuan ◽  
Dian-Chuan Xing ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow Resistance ◽  
Natural Circulation ◽  
Rectangular Channel ◽  
Rolling Motion

Numerical investigation on heat transfer to supercritical CO 2 in rolling motion

2017 ◽  
Vol 106 ◽  
pp. 97-110 ◽  
Author(s):  
Zhenxing Zhao ◽  
Yuansheng Lin ◽  
Shiwei Yao ◽  
Kelong Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Investigation ◽  
Rolling Motion
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