Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Heat and Flow Characteristics During Melting Process of a PCM Inside a Liquid Flexitank for Cargo Containers

화물 컨테이너용 액상 백 내부 PCM의 용융 과정에 대한 열유동 특성 해석

  • Received : 2023.11.07
  • Accepted : 2023.11.30
  • Published : 2024.03.31
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Abstract

This study examined the natural convection heat flow characteristics of the melting process of PCM (palm oil) inside a liquid flexitank(bag) for a cargo container. A film heating element was installed on the bottom of the container, and numerical analysis was performed under heat flux conditions of 1,000 to 4,000 W/m2. As a result, the melt interface of the PCM rises to a nearly horizontal state over time. In the initial stage, conduction heat transfer dominates, but gradually waves at the cell flow and melt interfaces are formed due to natural convection heat transfer. As melting progresses, the Ra number increases parabolically, and the Nu number increases linearly and has a constant value. The Nu number rises slowly under low heat flux conditions, whereas under high heat flux conditions, the Nu number rises rapidly. As the heat flux increases, the internal temperature oscillation of the liquid phase after melting increases. However, under high heat flux conditions, excess heat exceeding the latent heat is generated, and the temperature of the molten liquid is raised, so the increase in melting rate decreases. Therefore, the appropriate heating element specification applied to a 20-ton palm oil container is 2,000 W/m2.

Keywords

Acknowledgement

이 연구는 2022년 중소기업진흥재단의 구매조건부 성과확산산업 일환으로 연구비 지원(과제번호 S3220404)을 받아 수행되었습니다.

References

  1. Freight Right, https://www.freightright.com/kb/teu (Accessed on 2023. 08. 22).
  2. Placa A., https://www.cswindow.contshipitalia.com/en/container-terminal (Accessed on 2023. 07. 27).
  3. Tween, http://www.ktween.com/lmth/02_prod/prod04.php (Accessed on 2023. 07. 27).
  4. Fadl, M. and Eames, P. C., 2019, "Numerical Investigation of the Influence of Mushy Zone Parameter Amush on Heat Transfer Characteristics in Vertically and Horizontally Oriented Thermal Energy Storage Systems," Applied Thermal Engineering, Vol. 151, pp.90~99.
  5. Lei, G.-L., Dong, W., Zhang, M., Guo, Z.-Q. and Liu, Y.-Z., 2017, "Numerical Investigation on Heat Transfer and Melting Process of Ice with Different Porosities," International Journal of Heat and Mass Transfer, Vol. 107, pp. 934~944.
  6. Huang, L. and Piontek, U., 2017, "Improving Performance of Cold-Chain Insulated Container with Phase Change Material: An Experimental Investigation," Appl. Sci., Vol. 7(12), 1288.
  7. Korea EM, 2020, "Container Liner and Reaper Container Replacement that Reduces Logistics Costs," https://www.kemcorp.co.kr/blogPost/10.
  8. Korea EM, 2019, "Container Liner," https://www.kemcorp.co.kr/blogPost/newsroom1.
  9. Sun FlexiTanks, https://sunflexitanks.com (Accessed on 2023. 09. 04).
  10. Tweennano, 2022, "Fixed Temperature Planar Heating Element for Container," KR10-2370111.
  11. Alphatherm Webshop, https://alphathermliners.com/steam-heating-pad-for-flexitanks (Accessed on 2023. 09. 03).
  12. Chauhan, V., Yadav, A. and Soni, S. K., 2017, "Simulation of Melting Process of a Phase Change Material (PCM) Using ANSYS (Fluent)," International Research Journal of Engineering and Technology (IRJET), Vol. 4(5), pp.3289~3294.
  13. Madruga, S. and Curbelo, J., 2018, "Dynamic of Plumes and Scaling During the Melting of a Phase Change Material Heated from Below," International Journal of Heat and Mass Transfer, Vol. 126, pp.206~220.
  14. Guo, J., Liu, J., Ren J., Zeng, Z. and Lu E., 2022, "Experimental Study on Thermal Storage Characteristics of Cold Storage Distribution Box," Journal of Energy Storage, Vol. 55, Part A, 105475.
  15. Mahmoud, M. Z., Mohammed, H., Mahdi, J. M., Bokov, D. O., Khedher, N. B., Alshammari, N. K., Talebizadehsardari, P. and Yaici, W., 2021, "Melting Enhancement in a Triple-Tube Latent Heat Storage System with Sloped Fins," MDPI Nanomaterials, Vol. 11(11), 3153.
  16. Hassab, M. A. and Beng, A., 2017, "Effect of Volume Expansion on the Melting Process's Thermal Behavior," Applied Thermal Engineering Vol. 115, pp.350~362.
  17. Heo, S. M., Hyun, S. W., Jeong, H. J. and Shin, D. H., 2023, "Numerical Analysis of the Thermal Fluid Characteristics of Phase Change Material in Can Type Container," Journal of the Korean Society of Visualization Vol. 21(2), pp.63~71.
  18. Guo, W., Zhao, R., Liu, Y. and Huang, D., 2021, "Semi-Theoretical Correlations of Melting Process Driven by Rayleigh-B'enard Convection Suitable for Low Melting Point Metal," Case Studies in Thermal Engineering Vol. 28, 101511.
  19. Satbhai, O., Roy, S., Ghosh, S., Chakraborty, S. and Lakkaraju, R., 2019, "Comparison of the Quasi-Steady-State Heat Transport in Phase-Change and Classical Rayleigh-Benard Convection for a Wide Range of Stefan Number and Rayleigh Number," Physics of Fluids Vol. 31, 096605