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Research Papers

Influence of Pore Density and Porosity on the Melting Process of Bio-Based Nano-Phase Change Materials Inside Open-Cell Metal Foam

[+] Author and Article Information
Kumar Venkateshwar, Soroush Ebadi, Hari Simha

School of Engineering,
University of Guelph,
Guelph, ON N1G 2W1, Canada

Shohel Mahmud

School of Engineering,
University of Guelph,
Guelph, ON N1G 2W1, Canada
e-mail: smahmud@uoguelph.ca

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 29, 2018; final manuscript received April 15, 2019; published online May 23, 2019. Assoc. Editor: Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 11(4), 041004 (May 23, 2019) (12 pages) Paper No: TSEA-18-1631; doi: 10.1115/1.4043662 History: Received November 29, 2018; Revised April 15, 2019

In this paper, experimental investigations were carried out to observe the melting process of a bio-based nano-phase change materials (PCM) inside open-cell metal foams. Copper oxide nanoparticles with five different weight fractions (i.e., 0.00%, 0.08%, 0.10%, 0.12%, and 0.30%) were dispersed into bio-based PCM (i.e., coconut oil) to synthesize nano-PCMs. Open-cell aluminum foams of different porosities (i.e., 0.96, 0.92, and 0.88) and pore densities (i.e., 5, 10, and 20 pores per inch (PPI)) were considered. An experimental setup was constructed to monitor the progression of the melting process and to measure transient temperatures variations at different selected locations. Average thermal energy storage rate (TESR) was calculated, alongside the melting time was recorded. The effects of various nanoparticles concentration, metal foam pore densities, porosities, and isothermal surface temperature on the melting time, TESR, thermal energy distribution, and the melting behavior were studied. It was observed that the melting time significantly reduced by using metal foam and increasing the isothermal surface temperature. It was concluded that the effect of adding nanoparticles on the TESR depends on the characteristics of metal foam, as well as, the weight fractions of nanoparticles. The change in TESR varied from −1% to 8.6% upon addition of 0.10 wt % nanoparticles compared to pure PCM, whereas the increase in the nanoparticles concentration from 0.10% to 0.30% changed TESR by −10.6% to 4.5%. The results provide an insight into the interdependencies of parameters such as pore density and porosity of metal foam and nanoparticles concentration on the melting process of nano-PCM in metal foam.

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Figures

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Fig. 1

(a) Schematics of complete experimental setup and (b)plate-type heat excahnger with locations of 12 T-type thermocouples

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Fig. 2

Schematics of the enclosure with a cold plate with their dimensions

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Fig. 3

Different Stages of melting of nano-PCM having 0.08 wt % nanoparticles in 0.92 porosity metal foam having 10 PPI pore density, with isothermal boundary temperature of 54 °C

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Fig. 4

Solid–liquid interfaces for nano-PCM impregnated in the metal foam having a pore density of 5 PPI and 0.92 porosity with 0.10 wt % nanoparticles

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Fig. 5

Solid–liquid interfaces for nano-PCM impregnated in the metal foam having a pore density of 10 PPI and 0.92 porosity with 0.10 wt % nanoparticles

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Fig. 6

Solid–liquid interfaces for nano-PCM impregnated in the metal foam having a pore density of 20 PPI and 0.92 porosity with 0.10 wt % nanoparticles

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Fig. 7

Comparison of TESR (W) of different nano-PCM at different isothermal surface temperature impregnated in the metal foams of 0.92 porosity and different pore densities

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Fig. 8

Solid–liquid interfaces for nano-PCM impregnated in the metal foam of 0.96 porosity and 5 PPI pore density with 0.10 wt % nanoparticles

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Fig. 9

Solid–liquid interfaces for nano-PCM impregnated in the metal foam of 0.88 porosity and 5 PPI pore density with 0.10 wt % nanoparticles

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Fig. 10

Comparison of TESR (W) of nano-PCM with different concentration of nanoparticles subject to different isothermal surface temperature impregnated in the metal foams with different porosity and pore density of 5 PPI

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