Determination of the thermal conductivity of poor conductive materials in the form of disc by self-constructed Lee’s disc apparatus

Kharshiduzzaman, M.; Hossain, Md. Saif; Ali, Sazid; Ahmed, Soumik

doi:10.1063/1.5115959

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…The thermal conductivity coefficient is an important parameter for internal thermal insulation of SRM, it indicates the ability to resist the heat transferred by conduction from combustion of propellant to the metal case. Thermal conductivity of EHSMs was assessed by employing Lee's disk method for specimens with specific dimensions 24 . Lee's disc setup used in measuring the thermal conductivity of the prepared composites.…”

Section: Experimental Workmentioning

confidence: 99%

“…Thermal conductivity of EHSMs was assessed by employing Lee's disk method for specimens with specific dimensions. 24 Lee's disc setup used in measuring the thermal conductivity of the prepared composites. where the sample of low thermal conductivity is placed between two metal discs with the same diameter and a steam chamber is added to the upper disc as the steam enters the disc to raise its temperature and then comes out, the temperatures at the two discs are measured by means of attaching a thermometer in each disc, the two discs are made from brass with the same thermal conductivity and enable the system to reach equilibrium such that the heat flow through the badly conducting disc equals the heat loss by the lower disc to convection.…”

Section: Characterizationmentioning

confidence: 99%

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Study the effect of different fillers on the performance of ethylene propylene diene monomer rubber‐based thermal shielding materials

Mosa,

Mokhtar,

Fouda

et al. 2023

Polymers for Advanced Techs

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Polymeric composites are becoming increasingly popular materials due to their wide range of uses in heat shielding materials for solid rocket motors and aerospace applications. Novel polymeric composites are prepared and evaluated containing chopped carbon fibers, glass fibers (GF), and basalt fibers (BF), besides, recently used fillers such as Kevlar fibers (KF), and fumed silica (FS) to study their effects on the mechanical, thermal, and ablative properties of the ethylene propylene diene monomer (EPDM) hybrid composite. Mechanical, chemical, thermal, and ablative tests are performed to show the performance of the prepared polymeric composites. Experimental investigations have shown that the addition of GF to the EPDM matrix has a great influence on raising the tensile strength to 6.570 MPa. By incorporating KFs into EPDM, a solid char layer is formed during ablation, resulting in the best ablative performance with a decrease in the ablation rate of 73%, while the addition of FS, and BF to EPDM gives the best thermal stability results with total weight loss of 80.34%, and 81.77%, respectively.

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Section: Experimental Workmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Study the effect of different fillers on the performance of ethylene propylene diene monomer rubber‐based thermal shielding materials

Mosa,

Mokhtar,

Fouda

et al. 2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Lee's disc method is effectively used to find the thermal conductivity of uniform specimens that are bad conductors (Sombatsompop and Wood, 1997;Philip and Fagbenle, 2014;Kharshiduzzaman et al, 2019). Since it is impossible to mould the organic substrate specimens like wood bark and bio char into uniform disc shapes (Philip and Fagbenle, 2014), it is not advisable to incorporate Lee's disc method to find the thermal conductivity of growing mediums.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Green roof substrates—A literature review

Kader

Chadalavada²,

Jaufer³

et al. 2022

Front. Built Environ.

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Green roofs are becoming increasingly popular in urban construction due to their wide array of benefits for creating a sustainable ecosystem. Many stakeholders invest in green roofs in the 21st century to enhance the environmental quality and mitigate urban ecological pollution. The substrate layer is the most important and critical component of green roof systems. The objective of the review study is to present the important information regarding the required elements that need to be considered for substrate selection of green roofs by critically reviewing the scientifically published articles. Research findings from past studies relevant to green roofs, vegetation and selective substrate parameters were extensively discussed under different topics related to water retention, drought resistance and related physico-chemical parameters. The generalities in past research articles were presented and special focus was provided on specific research articles those presented novelty regarding green roof substrates. Furthermore, the hotspots in all the considered research articles were commentatively identified and the appropriate solutions were evaluated. The critical review of published research articles indicates that most of the research on green roof substrates was conducted in either controlled laboratories or greenhouses and did not provide much importance to actual field tests. Therefore, these research findings are not sufficient to obtain the realistic field outcomes of the research. Future studies on green roof substrates should need to incorporate field experiments along with classical controlled tests by adhering to standard guidelines for assimilating climatic influences in substrates. Few studies have focused on dry climates, and further research needs to be conducted on dry climates due to their high susceptibility to drought and evapotranspiration. This manuscript would be the first review article that mainly focuses on substrates for green roofs, which is a novel aspect.

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“…1) is to determine the most thermally resistive substrate among the selected specimens because a highly thermal-resistive substrate will protect the thermal comfort of the building by avoiding the heat conduction from solar radiation on green roofs. Although it is accepted that Lee's apparatus can determine the thermal conductivity of poor conductors (Kharshiduzzaman, Hossain, Ali, & Ahmed, 2019;Philip & Fagbenle, 2014;Sombatsompop & Wood, 1997), it is not applicable for this test because soil mixtures with organic wastes (i.e. substrate candidates) cannot be moulded into disc shapes due to their heterogeneity and voids.…”

Section: Thermal Conductivity Testmentioning

confidence: 99%

Feasibility study for estimating optimal substrate parameters for sustainable green roof in Sri Lanka

Kader

Spalević

Dudić

2022

Environ Dev Sustain

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In twenty-first century buildings, green roof systems are envisioned as great solution for improving Environmental sustainability in urban ecosystems and it helps to mitigate various health hazards for humans due to climatic pollution. This study determines the feasibility of using five domestic organic wastes, including sawdust, wood bark, biochar, coir, and compost, as sustainable substrates for green roofs as compared to classical Sri Lankan base medium (fertiliser + potting mix) in terms of physicochemical and biological parameters associated with growing mediums. Comprehensive methodologies were devised to determine the thermal conductivity and electric conductivity of growing mediums. According to preliminary experimental results, the most suitable composition for green roof substrates comprised 60% organic waste and 40% base medium. Sawdust growing medium exhibited the highest moisture content and minimum density magnitudes. Biochar substrate was the best performing medium with the highest drought resistance and vegetation growth. The wood bark substrate had the highest thermal resistance. Growing mediums based on compost, sawdust, and coir produced the best results in terms of nitrate, phosphate, pH, and electric conductivity (EC) existence. This study provided a standard set of comprehensive comparison methodologies utilising physicochemical and biological properties required for substrate characterization. The findings of this research work have strong potential in the future to be used in selecting the most suitable lightweight growing medium for a green roof based on stakeholder requirements.

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Determination of the thermal conductivity of poor conductive materials in the form of disc by self-constructed Lee’s disc apparatus

Cited by 8 publications

References 5 publications

Study the effect of different fillers on the performance of ethylene propylene diene monomer rubber‐based thermal shielding materials

Study the effect of different fillers on the performance of ethylene propylene diene monomer rubber‐based thermal shielding materials

Green roof substrates—A literature review

Feasibility study for estimating optimal substrate parameters for sustainable green roof in Sri Lanka

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