Publication de 6 numéros par an
ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110
Indexed in
Steady and Dynamic Thermo-Fluid Performance of Molten Salt in Paddle Heat Exchangers
RÉSUMÉ
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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Rajeh Taha, Tu Ping, Lin Hua, Zhang Houlei, Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles, Entropy, 20, 8, 2018. Crossref