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Study on Flow and Heat Transfer Performance of Molten Salt Based Nanofluids in Shell and Twisted Tube Heat Exchanger with Shutter Baffle

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Abstract

Molten salt as heat transfer and thermal storage medium is wildly used in concentrating solar power plant (CSP). At present, the traditional shell-and-tube heat exchanger is commonly used in CSP. So far, the research on shutter baffle heat exchanger with twisted tube (SBHX-TT) of molten salt based nanofluids is relatively few. In this work, the flow and heat transfer characteristics of molten salt based nanofluids in SBHX-TT with different geometric parameters are studied. The heat transfer coefficient, pressure drop, comprehensive evaluation index and synergistic field are comparetively analyzed. The results show that when Re is between 3487 and 20,924, the convective heat transfer coefficient increases with the decrease of the inclination angle and the ratio of baffle pitch to grille sheet width (Y), the pressure drop also concurrently increases. When Y = 4, the baffle inclination angle is 30°, the convective heat transfer maximally increases by 104.4% and the pressure drop increases by 174.2% compared with that without baffle. Through response surface analysis, the obtained highest comprehensive evaluation index is 1.51, when the grille sheet inclination angle is 36° and baffle pitch to grille sheet width is 5.

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Funding

This work is supported by National key research and development program of China (2022YFB2405203), National Natural Science Foundation of China (NSFC) (51906003), Science and technology general project of Beijing Municipal Education Commission (KM202210005016).

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Authors and Affiliations

  1. MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing, 100124, China

    Songtao Han, Cancan Zhang, Yuting Wu, Yuanwei Lu & Junnan Niu

Authors
  1. Songtao Han
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  2. Cancan Zhang
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  3. Yuting Wu
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  4. Yuanwei Lu
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  5. Junnan Niu
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Contributions

SH performed the experiment and wrote the main manuscript. CZ wrote the main manuscript and prepared figures. YW revised the manuscript. YL and JN reviewed the manuscript All authors reviewed the manuscript.

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Correspondence to Cancan Zhang.

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Han, S., Zhang, C., Wu, Y. et al. Study on Flow and Heat Transfer Performance of Molten Salt Based Nanofluids in Shell and Twisted Tube Heat Exchanger with Shutter Baffle. Int J Thermophys 44, 30 (2023). https://doi.org/10.1007/s10765-022-03134-6

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  • DOI: https://doi.org/10.1007/s10765-022-03134-6

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