Journal
CASE STUDIES IN THERMAL ENGINEERING
Volume 30, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.csite.2022.101770
Keywords
Nano-encapsulated phase change material; Heather and cooler; Natural convection; n-nonadecane; Numerical method
Categories
Funding
- King Khalid University [R.G.P.2/72/42]
- Taif University
- Taif University [TURSP-2020/77]
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This study simulated the natural convection flow of water with Nano-encapsulated phase change material (NPCM) in an insulated chamber. The effects of Rayleigh number, volume fraction, and location of phase change zone on the convective heat transfer coefficient were investigated. It was found that phase change of NPCM occurred at low Rayleigh numbers and was directly related to the thermal conductivity of the mixture. Increasing the volume fraction of NPCM in water significantly enhanced the convective heat transfer coefficient.
In the present study, the natural convection flow of water with Nano-encapsulated phase change material (NPCM) was simulated inside an insulated chamber, which a pair of pipes were considered as a heater and cooler sources with the boundary condition of uniform temperature. The NPCM's core was made of n-nonadecane with melting temperature of 30.44 degrees C. This core has ability to change the liquid-solid phase to transfer heat between the heater and the cooler sources. Current simulation was steady state and was solved by SIMPLE algorithm based on FVM to investigate the effects of Rayleigh number, volume fraction and location of phase change zone on the convective heat transfer coefficient. Observations showed that, phase change of NPCM occurs at low Rayleigh numbers but had no effect on the convective heat transfer coefficient, but it was directly related to the thermal conductivity of mixture. Moreover, adding volume fraction of NPCM 0.02 into water increased the convective heat transfer coefficient by 10.43%, 19.1% and 18.3% compared to pure water for Rayleigh numbers 10(2), 10(4), and 10(6), respectively.
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