The effect of aspect ratios and inclination angles on the thermal energy storage of phase change materials in partially filled metal foam

Menglong He , Hui Wang , Qifan Ying , Shang Liu , Liejin Guo
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Abstract

This paper conducted a numerical study on the thermal energy storage (TES) of partially filled metal foam composite phase change materials (PCM) in rectangular cavity devices. The melting mechanisms under different aspect ratios (AR) and inclination angle models were analyzed, and a predictive formula for the dimensionless TES rate density z' was established. The results indicate that the TES performance of PCM improves with the increase of AR. When AR = 2, the enhancement efficiency reaches 22.6 %, exhibiting the optimal improvement effect. When AR is greater than 8, heat conduction dominates the entire melting process. The natural convection effect is the best in the 60° inclination angle model. When AR = 1, the energy storage performance at θ = 60° is 5 % higher than that at θ = 90°, but for other ARs, θ = 60° leads to a decrease in performance. This is because the change in inclination angle triggers the Rayleigh - Bénard convection phenomenon, generating counter - rotating vortices that inhibit the energy storage efficiency, and as AR increases, the inhibition becomes more significant. The established predictive formula takes both AR and inclination angle into account, which is more comprehensive.
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长宽比和倾角对部分填充金属泡沫中相变材料热能储存的影响
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来源期刊
CiteScore
11.00
自引率
10.00%
发文量
648
审稿时长
32 days
期刊介绍: International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.
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