Constrained melting of graphene-based phase change nanocomposites inside a sphere

Prabakaran, Rajendran; Kumar, J.; Lal, D. Mohan; Selvam, C.; Harish, Sivasankaran

doi:10.1007/s10973-019-08458-4

Cited by 48 publications

(11 citation statements)

References 34 publications

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“…The drop in solidification time is found to be 15.68, 26.14, and 39.21% with 0.1, 0.3, and 0.5 vol% of GnP loadings. Based on our previous studies [28], there was no significant reduction in melting time while increasing GnP loadings from 0.4 to 0.5 vol%, due to the increased dynamic viscosity. Thus, the study is limited to 0.5 vol% GnP concentration.…”

Section: Effect Of Gnp Loading On the Solidification Behavior Of The mentioning

confidence: 75%

“…In our previous study [28], melting behavior of the GnPs enhanced OM08 PCM in a sphere shows that the addition of GnPs reduced the melting time by up to 26% and 21% with 0.5 vol%. It was also found that the addition of GnPs led to transition from Newtonian to non-Newtonian behavior at low shear rates.…”

Section: Sidney Et Al [20]mentioning

confidence: 80%

“…The prepared samples were kept undisturbed for 10 days and it was confirmed visually that there was no settlement of GnPs. Further, the stability of nanocomposite was measured by the zeta potential distribution method, which was previously reported in our work [28].…”

Section: Preparation Of Pcm Nanocompositesmentioning

confidence: 93%

“…The experimental setup, as previously reported in our work on melting [28], consisted of a spherical capsule (made: Aluminum, outer diameter: 80 mm), a constant temperature refrigerating bath (Capacity: 5 l), cooling coil, temperature controller and data logging unit (Agilent-34970A) with a personal computer, as shown in Figure 2. Generally, freezing inside the sphere is symmetric about its vertical axis when the surrounding is maintained at a constant temperature.…”

Section: Experimental Facilitymentioning

confidence: 99%

“…Maximum enhancement in thermal conductivity for the 0.5 vol% of GnPs is found to be 102.17% and 45.69% in solid and liquid states, respectively. The reason behind the higher thermal conductivity enhancement in the solid state than that in the liquid is attributed to the formation of percolating networks formed during the phase transition and the crystalline nature in the solid state which minimizes the interfacial resistance [28,31]. The lower enhancement in the liquid phase of the nanocomposite is attributed to the molecular disorder of the PCM during phase transition and higher interfacial resistance [31,32].…”

Section: Effect Of Gnp Loading On the Thermal Conductivity Of Pcm Nanmentioning

confidence: 99%

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Solidification of Graphene-Assisted Phase Change Nanocomposites inside a Sphere for Cold Storage Applications

et al. 2019

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In this work, we experimentally investigated the solidification behavior of functionalized graphene-based phase change nanocomposites inside a sphere. The influence of graphene nanoplatelets on thermal transport and rheological characteristics of the such nanocomposites were also discussed. We adopted the covalent functionalization method to prepare highly stable phase change nanocomposites using commercially available phase change material (PCM) OM08 as the host matrix and graphene nanoplatelets (GnPs) with 0.1, 0.3, and 0.5 volume percentage as the nano inclusions. We report a maximum thermal conductivity enhancement of ~102 and ~46% with 0.5 vol% in the solid and liquid states, respectively. Rheological measurements show that the pure PCM shows Newtonian behavior, whereas the inclusion of GnPs leads to the transition to non-Newtonian behavior, especially at lower shear rates. Viscosity of the nanocomposite increases with an increase in the volume fraction of GnP. For 0.5 vol% of GnPs, maximum increase in viscosity was found to be ~37% at a shear rate of 1000 s−1. Time required for complete solidification decreases with the loading of GnPs. Maximum reduction in solidification time with 0.5 vol% of GnPs was ~40% for bath temperature of −10°C.

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Section: Effect Of Gnp Loading On the Solidification Behavior Of The mentioning

confidence: 75%

Section: Sidney Et Al [20]mentioning

confidence: 80%

Section: Preparation Of Pcm Nanocompositesmentioning

confidence: 93%

Section: Experimental Facilitymentioning

confidence: 99%

Section: Effect Of Gnp Loading On the Thermal Conductivity Of Pcm Nanmentioning

confidence: 99%

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Solidification of Graphene-Assisted Phase Change Nanocomposites inside a Sphere for Cold Storage Applications

et al. 2019

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Simulation and performance analysis of a cooling energy storage system based on encapsulated nano‐enhanced phase change materials

et al. 2022

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The present study investigates the effects of different parameters on the performance of a cold energy storage system based on spherical capsules using twoand three-dimensional (2D and 3D) numerical analyses. The effect of different arrangements of the capsules is studied using a 2D model. The impact of using nanoparticles, diameter, and material of a spherical capsule and working parameters that affect the melting and solidification process are evaluated in a 3D model. The results revealed that the hexagonal arrangement compared to the triangular and rectangular arrangements, yields a lower charging time of 10.71% and 16.67%, respectively. Utilization of a 3% volume fraction of graphene nanoparticles in the phase change material reduces the charging and discharging process time by 11.11% and 22.22%, respectively. The diameter of the capsule is an effective parameter for the charging and discharging time, so the capsule with a diameter of 20 mm in comparison with a diameter of 40 mm reduces the charging and discharging time by 71.1% and 66.67%, respectively. Also, capsules made of graphite yield lower charging process time compared to plastic and glass capsules by 17.39% and 5%, respectively.

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Experimental investigation of stability and thermal conductivity of phase change materials containing pristine and functionalized multi-walled carbon nanotubes

Ranjbar

Masoumi

Khoshkhoo

et al. 2019

J Therm Anal Calorim

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Constrained melting of graphene-based phase change nanocomposites inside a sphere

Cited by 48 publications

References 34 publications

Solidification of Graphene-Assisted Phase Change Nanocomposites inside a Sphere for Cold Storage Applications

Solidification of Graphene-Assisted Phase Change Nanocomposites inside a Sphere for Cold Storage Applications

Simulation and performance analysis of a cooling energy storage system based on encapsulated nano‐enhanced phase change materials

Experimental investigation of stability and thermal conductivity of phase change materials containing pristine and functionalized multi-walled carbon nanotubes

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