Faculty Publications
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Item Preparation and characterization of nanoparticle blended polymers for thermal energy storage applications(American Institute of Physics Inc. subs@aip.org, 2019) Chavan, S.; Gumtapure, V.; Arumuga Perumal, D.A.This paper is concerned with the comprehensive procedure of preparing, morphological characterization and thermal property evaluation of nanoparticle blended polymer composites. Polymer composites are intended to consecrate the thermal energy storage applications. Linear low-density polyethylene (LLDPE) is incorporated with functionalized graphene with different concentrations (1, 3 and 5%). The morphological study revealed compatibility of polymer composites, at lower concentrations (1-3%,) it shows homogenous dispersion, but above threshold limit the particle distribution is non-homogenous with coarse surface structures. Higher concentration (5%) of nanoparticles emulsifies the molecules and generates micelles between themselves. The thermal conductivity of the polymer composite is significantly enhanced with the reduction of specific heat. At lower concentrations polymer exhibits homogeneous dispersion and the interfacial interaction is comparatively higher, optimal concentration (3%,) of nanoparticle provides favorable results and hence polymer composites with ideal concentration can be utilized for thermal energy storage applications. © 2018 Author(s).Item Preparation of functionalized graphene-linear low-density polyethylene composites by melt mixing method(American Institute of Physics Inc. subs@aip.org, 2020) Chavan, S.; Gumtapure, V.; Arumuga Perumal, D.A.Graphene is attracting gigantic amount of scientific interest due to its excellent thermo-physical properties. Graphene integration improves the electrical and mechanical properties of polyethylene-based polymers. This paper is concerned with the comprehensive procedure of preparing, morphological characterization and thermal property evaluation of nanoparticle blended polymer composites. Polymer composites are intended to consecrate the thermal energy storage applications. Linear low-density polyethylene (LLDPE) is incorporated with functionalized graphene with different concentrations (1, 3 and 5%). The morphological study revealed compatibility of polymer composites, at lower concentrations (1-3%) it shows homogenous dispersion, but above threshold limit the particle distribution is non-homogenous with coarse surface structures. Higher concentration (5%) of nanoparticles emulsifies the molecules and generates micelles between themselves. The thermal conductivity of the polymer composite is significantly enhanced with the reduction of specific heat. At lower concentrations polymer exhibits homogeneous dispersion and the interfacial interaction is comparatively higher, optimal concentration (3%) of nanoparticle provides favorable results and hence polymer composites with ideal concentration can be utilized for thermal energy storage applications. © 2020 Author(s).Item Performance assessment of composite phase change materials for thermal energy storage-characterization and simulation studies(Bentham Science Publishers, 2021) Chavan, S.; Gumtapure, V.; Arumuga Perumal, D.Background: The present study mainly focuses on the development of new Thermal Storage Materials (TSM) and compare the performance for thermal energy storage capacity. Linear Low-Density Polyethylene (LLDPE) based Composite Phase Change Materials (CPCMs) is prepared, and its properties are analyzed using characterization, analytical calculations, and numerical simulation meth-ods. The composites are prepared by blending the functionalized graphene nanoparticles (1, 3 & 5%) with three different concentrations into LLDPE. All three CPCMs show enhanced thermal performance compared to the base material, but it is noticed that higher concentrations of nanoparticles increase the dynamic viscosity and produce an adverse effect on thermal performance. Thermal characterization shows improved latent heat capacity with nanoparticle concentration, analytical and numerical results also compared, which shown a difference of 10 to 25%. Objective: The purpose of this study is the development and evaluation of the thermal storage capacity of different thermal storage materials and enlighten the techniques used for characterizing the storage materials. Methods: Composite material preparation is carried out by using twin-screw extruders, characterization of developed material is done through FTIR, SEM, and DSC analysis. For complete analysis character-ization, analytical calculations and numerical simulation methods are used. Results: Linear low-density polyethylene-based composite materials can be successfully developed using a twin-screw extruder. This extrusion provided proper dispersion of nanoparticles into the base material, and it is validated by SEM analysis. DSC analysis confirmed the enhancement in the thermo-physical properties of composite materials. Conclusion: The latent heat capacity increased around 20% during the heating cycle and reduced ap-proximately 23% during the cooling cycle for base material and 5% addition of nanoparticle, respec-tively. The comprehensive study accomplishes that the optimum concentration of nanoparticle provides better thermal performance for thermal energy storage applications. © 2021 Bentham Science Publishers.Item Thermal behavior of composite phase change material of polyethylene in a shell and coil-based thermal energy storage: Numerical analysis(Elsevier Ltd, 2023) Sheikh, M.I.A.R.; Ahammed, M.E.; Gumtapure, V.Energy management and environmental sustainability are important concerns across the world at present. In that context, using recycled waste material such as polyethylene as a phase change material (PCM) in a latent heat storage (LHS) system fulfils both motives. However, effective energy conversion requires proper design of thermal energy storage (TES) and improvement of thermophysical properties of the working material. In the present numerical analysis, a shell and coil-based TES is considered with linear low-density polyethylene (LLDP) as base material to be compounded with functionalized graphene in three different concentrations such as 1 %, 3 %, and 5 %, called composite phase change material i.e., CPCM1, CPCM2, and CPCM3 respectively. The diameter ratio between the coil and shell of TES, termed the geometrical ratio (Gr) is taken as 0.3, 0.5, and 0.7 in the analysis, whereas the coil's pitch length (pc) is varied from 10 mm to 30 mm. The orientation of TES is also varied from horizontal (0°) to vertical position (90°) with an interval of 30° inclination. Results reveal that the charging time for the complete liquefaction of storage material decreases a maximum of 65 % in the case of CPCM 3 with 5 % graphene. Increasing the heat supply from 125 W to 250 W sharply decreases the charging time, however, further increasing heat power affects moderately. The charging time gradually decreases to 56 % and 54 % in the case of LLDP and CPCM 2 respectively as Gr increases from 0.3 to 0.7 in both cases. The pitch length effect on the thermal performance of TES is found to be negligible. The analysis shows that the horizontal position of TES accrues the lowest charging time for the thorough melting of PCM. © 2023 Elsevier LtdItem Numerical analysis of polyethylene based nano-enhanced phase change material in cylindrical storage system(Taylor and Francis Ltd., 2024) Sheikh, M.I.A.R.; Gumtapure, V.; Ahammed, M.E.Environmental sustainability encompasses various dimensions like waste management, energy conservation, and environmental impact. The use of waste plastic; Linear Low-density polyethylene (LLDPE) as a phase change material (PCM) offers a sustainable solution for energy and the environment. This study investigates LLDPE/ functionalize graphene composites for latent heat storage using a shell and helical coil for effective energy conversion. The simulation is carried out for constant flux and constant temperature heat supply to understand the influence of nano additives and geometrical parameters such as spiral coil diameter (Dc), pitch (Pc), and orientation of storage unit (θ). The result reveals that nano additive influence effectively and reduces the charging time approximately from 20 to 40% for 1–5% of nano-addition. Simulation results reveals that the spiral coil diameter is crucial for melting and heat transmission. The overall melting time is decreased by up to 56% by increasing the spiral coil diameter from 21 to 49 mm for LLDPE while the effect of pitch length variation is found not significant. The constant temperature heating at 160, 250 and 340°C gives effective results for charging time improvement. The geometrical orientations from 0 to 90 degrees report that the horizontal position is the best orientation for energy storage. © 2024 Informa UK Limited, trading as Taylor & Francis Group.