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Experimental Investigation of the Combined Effects of Stable Boiling Surfaces and Porous Structures on Pool Boiling Heat Transfer of Nanofluids
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Mohammad Ghorbani1   , Masoud Zareh *2 , Cyrus Aghanajafi3 , Mohammad Behshad Shafii4 |
1- Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran, Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran
2- Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran , masoud_zareh@iau.ac.ir
3- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran, Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
4- Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran |
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Abstract: (11 Views) |
Enhancing pool boiling heat transfer is essential for improving the efficiency and safety of high-heat-flux thermal systems. Nanofluids and engineered surfaces have been widely investigated as effective methods for boiling enhancement. However, the effect of porous structures on boiling surfaces stabilized by nanoparticle deposition during successive boiling-cooling cycles has not been previously reported. The experimental setup was validated using the Rohsenow correlation, while the measured critical heat flux (CHF) was compared with the Zuber and Haramura models, showing deviations of only 0.13% and 0.27%, respectively. In this study, a copper boiling surface was stabilized using SiO₂ nanofluids containing nanoparticles with size ranges of 20-30 and 60-70 nm through long-term successive boiling-cooling cycles. A ceramic honeycomb porous structure was then attached to the stabilized surface, and its effect on boiling performance was experimentally evaluated. The results showed that the porous structure increased the CHF by approximately 34% and 38% for the 20-30 and 60-70 nm nanoparticles, respectively, compared with stabilized surfaces without the porous structure. In addition, the boiling heat transfer coefficient (BHTC) increased by about 20%. These improvements are attributed to the higher density of active nucleation sites, enhanced liquid replenishment, and more efficient vapor removal within the porous structure. |
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| Keywords: pool boiling, stable boiling surface, porous structure, critical heat flux, nanofluid |
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Full-Text [PDF 1883 kb]
(7 Downloads)
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Type of Study: Research |
Subject:
Heat and Mass Transfer
Received: 2025/12/15 | Accepted: 2026/02/28 | Published: 2026/03/1
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| * Corresponding Author Address: Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran |
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