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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN 印刷: 2152-5102
ISSN オンライン: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v43.i5-6.80
pages 472-488

Steady and Dynamic Thermo-Fluid Performance of Molten Salt in Paddle Heat Exchangers

Liang Ji
School of Energy and Power Engineering, Nanjing University of Science and Technology Nanjing, Xiaolingwei 200, China
Xinzhi Liu
School of Energy and Power Engineering, Nanjing University of Science and Technology Nanjing, Xiaolingwei 200, China
Houlei Zhang
School of Energy and Power Engineering, Nanjing University of Science and Technology Nanjing, Xiaolingwei 200, China

要約

Paddle heat exchangers have been widely used in material heating processes. As working fluids, molten salts (e. g., Hitec salt) become favorable candidates in the temperature range 300 to 600°C. In this paper, based on CFD simulation we firstly investigated the steady heat transfer performance of molten salt in open hollow paddle-shaft element structure. The effects of paddle height and the hole axis angle on the heat transfer performance are documented. Flow guide plates are proposed to organize flow. The results show that for large paddle height, the heat transfer is improved by adjusting the hole axis angle and introducing flow guide plates and at the same time the pressure drop decreases. For one paddleshaft element, the flow and heat transfer performance in its two paddles is not symmetrical. The position of paddle-shaft element along the shaft does not have significant effect on molten salt flow. The steady analysis demonstrates the design optimization direction or constructal evolving direction. We further presented the hot air pre-heating time in cold-start process which is much less than the usual melting time of salt in boilers. The present work provides more insight in molten salt flow and heat transfer in open hollow paddle heat exchangers for design and control engineers.


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