تأثیر ویژگی‌های شبکه متخلخل آلومینیومی بر زمان ذوب کامل روغن نارگیل و یکنواختی دمای دیواره

نوع مقاله : مقاله علمی

نویسندگان
گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
در محفظه‌های حاوی ماده تغییرفازدهنده، دیواره‌های با شار گرمایی ثابت، افزایش دمای موضعی را تجربه می‌کنند. هدف پژوهش حاضر این است که با ثابت نگه‌داشتن ظرفیت گرمایی محفظه، زمان ذوب کامل کمینه شده و توزیع دما در دیواره گرم، یکنواخت باشد. در این مطالعه، شبکه متخلخل آلومینیومی، نیمی از محفظه حاوی روغن نارگیل به عنوان ماده تغییرفازدهنده را پُر کرده است. تأثیر مکان قرارگیری شبکه متخلخل، زاویه محفظه نسبت به افق، نسبت منظری محفظه، تراکم حفره‌های شبکه متخلخل، بر زمان ذوب کامل ماده تغییرفازدهنده، اختلاف دمای حداکثر دیواره با دمای میانگین و یکنواختی توزیع دما در دیواره گرم، به صورت عددی با نرم‌افزار ANSYS Fluent بررسی شده است. نتایج این پژوهش نشان می‌دهد که با افزایش تراکم حفره‌ها از 5 تا 20 حفره در اینچ، شاخص یکنواختی دما بیشتر می‌شود اما زمان لازم برای ذوب کامل ماده تغییرفازدهنده تا 6/12% افزایش می‌یابد. چنانچه مکان شبکه فلزی در نیمه پایینی محفظه باشد، کمترین زمان ذوب، معادل 2340 ثانیه را داراست. با افزایش نسبت منظری از 2 به 1 و سپس 5/0، شاخص یکنواختی دما بیشتر می‌شود اما زمان لازم برای ذوب کامل ماده تغییرفازدهنده تغییر چندانی نمی‌کند. تغییر زاویه محفظه نسبت به افق، تأثیر بسزایی بر شاخص یکنواختی توزیع دما ندارد اما بر زمان ذوب کامل بسیار مؤثر بوده به طوری که زمان ذوب در زاویه 30- درجه در مقایسه با 30+ درجه، 39% کمتر است. در نهایت، ترکیب بهینه این پارامترها، با روش تاگوچی تعیین شده است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The Effect of Aluminum Porous Network Characteristics on the Complete Melting Time of Coconut Oil and the Temperature Uniformity of the Wall

نویسندگان English

Seyyed Ali Naghedifar
Mohammad Moghiman
Mojtaba Mamourian
Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

In enclosures containing phase change materials (PCMs), walls subjected to a constant heat flux experience localized temperature rise. The objective of this study is to minimize the complete melting time while ensuring uniform temperature distribution on the heated wall, while maintaining the thermal capacity of the enclosure. In this study, an aluminum porous network occupies half of the enclosure containing coconut oil as the PCM. The effects of porous network placement, enclosure inclination angle relative to the horizontal, aspect ratio of the enclosure, and pore density of the porous structure on the complete melting time of the PCM, the maximum temperature deviation of the wall from the mean temperature, and the uniformity of the temperature distribution on the heated wall are numerically analyzed using ANSYS Fluent.
The results indicate that increasing the pore density from 5 to 20 pores per inch enhances temperature uniformity but increases the complete melting time by up to 12.6%. When the metallic network is positioned in the lower half of the enclosure, the shortest melting time of 2340 seconds is achieved. Increasing the aspect ratio from 2 to 1 and then to 0.5 improves temperature uniformity but has minimal impact on the complete melting time. The enclosure inclination angle has a significant influence on the complete melting time but a negligible effect on temperature uniformity. Specifically, at an inclination of -30 degrees, the melting time is 39% shorter than at +30 degrees. Finally, the optimal combination of these parameters is determined using the Taguchi method.

کلیدواژه‌ها English

Semi-porous aluminum cavity
Taguchi
Temperature uniformity index
Complete melting time
Coconut oil
‏[1] H. Mehling and L. F. Cabeza, Heat and cold storage with PCM: An up to date introduction into basics and applications, Springer Berlin Heidelberg, 2008. [Online]. Available: https://books.google.com/books?id=N8LGwUNYWX8C
[2] H. Mehling, M. Brütting, and T. Haussmann, “PCM products and their fields of application—An overview of the state in 2020/2021,” J. Energy Storage, vol. 51, p. 104354, 2022. doi: 10.1016/j.est.2022.104354
[3] V. Goel et al., “PCM-assisted energy storage systems for solar-thermal applications: Review of the associated problems and their mitigation strategies,” J. Energy Storage, vol. 69, p. 107912, 2023. doi: 10.1016/j.est.2023.107912
[4] A. Atal, Y. Wang, M. Harsha, and S. Sengupta, “Effect of porosity of conducting matrix on a phase change energy storage device,” Int. J. Heat Mass Transf., vol. 93, pp. 9–16, 2016. doi: 10.1016/j.ijheatmasstransfer.2015.09.033
[5] A. Iranmanesh, A. Ghorbani, and H. Farzan, “Numerical study of the effect of stepped fins on improving the performance of a thermal storage system in the presence of an intermediate plate and porous medium,” Eng. Energy Manage., vol. 2345–2951, 2025. (in Persian). doi: 10.22052/eem.2025.255727.1093
[6] H. Bahrami and M. Saberi, “Numerical investigation of the use of solid or porous fins to improve heat transfer in a two-tube heat exchanger containing PCM, suitable for satellite thermal management,” Aerospace Knowledge and Technology, vol. 93, pp. 9–16, 2025. (in Persian). [Online]. Available: https://www.astjournal.ir/article_711413_7eb5cd6882c7fcf4d5c20dca365d64dc.pdf
[7] S. Poran and D. H. Ahmed, “Effect of cavity shape and heat source/sink orientation on PCM melting,” J. Therm. Energy Syst., vol. 3, no. 1, 2018. [Online]. Available: https://www.researchgate.net/publication/324219075
[8] X. Hu, P. Chen, X. Guo, and X. Zhang, “Comparative studies on the thermal performance of novel PCM-based heat sinks using 3D-printed thermal conductivity enhancers,” Int. Commun. Heat Mass Transf., vol. 162, p. 108613, 2025. doi: 10.1016/j.icheatmasstransfer.2025.108613
[9] X. Hu et al., “Comparative studies on thermal management performance of PCM-based heat sinks filled with various height structured porous materials,” Appl. Therm. Eng., vol. 263, p. 125376, 2025. doi: 10.1016/j.applthermaleng.2024.125376
[10] M. Ghalambaz et al., “Melting process of the nano-enhanced phase change material (NePCM) in an optimized design of shell and tube thermal energy storage (TES): Taguchi optimization approach,” Appl. Therm. Eng., vol. 193, p. 116945, 2021. doi: 10.1016/j.applthermaleng.2021.116945
[11] M. Ghalambaz et al., “Phase-transition thermal charging of a channel-shape thermal energy storage unit: Taguchi optimization approach and copper foam inserts,” Molecules, vol. 26, no. 5, p. 1235, 2021. doi: 10.3390/molecules26051235
[12] Y. Liu et al., “Role of porous metal foam on temperature control and thermal runaway propagation of integrated battery thermal management systems,” Appl. Therm. Eng., p. 125712, 2025. doi: 10.1016/j.applthermaleng.2025.125712
[13] J. C. Kurnia et al., “Optimization of an innovative hybrid thermal energy storage with phase change material (PCM) wall insulator utilizing Taguchi method,” J. Energy Storage, vol. 49, p. 104067, 2022. doi: 10.1016/j.est.2022.104067
[14] A. Kotb and S. Wang, “Enhanced thermal storage performance with non-linear porosity distribution in copper foam-PCM composites,” J. Energy Storage, vol. 105, p. 114612, 2025. doi: 10.1016/j.est.2024.114612
[15] M. Al-Jethelah et al., “Charging nanoparticle enhanced bio-based PCM in open cell metallic foams: An experimental investigation,” Appl. Therm. Eng., vol. 148, pp. 1029–1042, 2019. doi: 10.1016/j.applthermaleng.2018.11.121
[16] S. Zhang et al., “A review of phase change heat transfer in shape-stabilized phase change materials (ss-PCMs) based on porous supports for thermal energy storage,” Renew. Sustain. Energy Rev., vol. 135, p. 110127, 2021. doi: 10.1016/j.rser.2020.110127
[17] A. Martínez et al., “Experimentally based testing of the enthalpy-porosity method for the numerical simulation of phase change of paraffin-type PCMs,” J. Energy Storage, vol. 69, p. 107876, 2023. doi: 10.1016/j.est.2023.107876
[18] Y. Xu, M.-J. Li, Z.-J. Zheng, and X.-D. Xue, “Melting performance enhancement of phase change material by a limited amount of metal foam: Configurational optimization and economic assessment,” Appl. Energy, vol. 212, pp. 868–880, 2018. doi: 10.1016/j.apenergy.2017.12.082
[19] P. Zhang, X. Xiao, and Z. Ma, “A review of the composite phase change materials: Fabrication, characterization, mathematical modeling and application to performance enhancement,” Appl. Energy, vol. 165, pp. 472–510, 2016. doi: 10.1016/j.apenergy.2015.12.043
[20] P. Knupp and J. Lage, “Generalization of the Forchheimer-extended Darcy flow model to the tensor permeability case via a variational principle,” J. Fluid Mech., vol. 299, pp. 97–104, 1995. doi: 10.1017/S0022112095003430
[21] B. J. Jones, D. Sun, S. Krishnan, and S. V. Garimella, “Experimental and numerical study of melting in a cylinder,” Int. J. Heat Mass Transf., vol. 49, no. 15–16, pp. 2724–2738, 2006. doi: 10.1016/j.ijheatmasstransfer.2006.01.006
[22] F. Iachachene, Z. Haddad, E. Abu-Nada, and M. A. Sheremet, “Natural convection melting of phase change material in corrugated porous cavities,” Sustain. Energy Technol. Assess., vol. 53, p. 102734, 2022. doi: 10.1016/j.seta.2022.102734
[23] J. Guo, Z. Du, G. Liu, X. Yang, and M.-J. Li, “Compression effect of metal foam on melting phase change in a shell-and-tube unit,” Appl. Therm. Eng., vol. 206, p. 118124, 2022. doi: 10.1016/j.applthermaleng.2022.118124
[24] H. M. Ali, M. M. Janjua, U. Sajjad, and W.-M. Yan, “A critical review on heat transfer augmentation of phase change materials embedded with porous materials/foams,” Int. J. Heat Mass Transf., vol. 135, pp. 649–673, 2019. doi: 10.1016/j.ijheatmasstransfer.2019.02.001
[25] R. Sinaga et al., “CPU cooling system based on phase changing material (PCM): Parafin wax,” AIP Conf. Proc., 2024. doi: 10.1063/5.0201066
[26] F. Farhan, R. M. Gul, and K. Akhtar, “Passive Cooling System for Laptop Computers using Phase Change Materials,” 2024. doi: 10.21203/rs.3.rs-4139275/v1
[27] A. Freddi and M. Salmon, “Introduction to the Taguchi method,” in Design principles and methodologies: from conceptualization to first prototyping with examples and case studies, Springer, pp. 159–180, 2019. doi: 10.1007/978-3-319-95342-7_7
 
 

  • تاریخ دریافت 20 دی 1403
  • تاریخ بازنگری 19 اسفند 1403
  • تاریخ پذیرش 25 فروردین 1404
  • تاریخ اولین انتشار 25 فروردین 1404
  • تاریخ انتشار 25 فروردین 1404