Thermal characterizations of the paraffin wax/low density polyethylene blends as a solid fuel

Kim, Soojong; Moon, Heejang; Kim, Jinkon

doi:10.1016/j.tca.2015.05.016

Cited by 44 publications

(41 citation statements)

References 16 publications

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“…Table 1 outlines the baseline case values of thermal deformation coefficient α, Young's modulus E, Poisson's ratio ν, and bulk modulus K used in the simulations. These properties were chosen to represent a composite consisting of microencapsulated PCM inclusions in a cementitious matrix [20][21][22][23]. Note that the bulk modulus K is related to the Young's modulus E and Poisson's ratio ν according to [8],…”

Section: Numerical Simulationsmentioning

confidence: 99%

A general method for retrieving thermal deformation properties of microencapsulated phase change materials or other particulate inclusions in cementitious composites

et al. 2017

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This study examined the effects of spherical core-shell particle inclusions, such as microencapsulated phase change materials (PCMs), on the thermal deformation behavior of cement-based composites. First, simulations of volumetric thermal deformation in representative microstructures were carried out, based on the finite element method (FEM), to predict the effective thermal deformation coefficient of the composites. Excellent agreement was found between the effective thermal deformation coefficient predicted by FEM and by the effective medium approximation (EMA) developed by Schapery (1968). Furthermore, the effective thermal deformation coefficient of cementitious composites with either microencapsulated PCM or quartz particulates was measured. The measured effective thermal deformation coefficients together with Schapery's model were used to retrieve the thermal deformation coefficients of the inclusions themselves. The thermal deformation coefficient of PCM microcapsules was estimated to be similar to that of the shell component due to partial filling of the microcapsules. The results show a means for (i) retrieving the thermal deformation properties of functional core-shell inclusions and (ii) for designing cementitious composites with PCMs which find use in the built environment and high-performance composites.

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Section: Numerical Simulationsmentioning

confidence: 99%

A general method for retrieving thermal deformation properties of microencapsulated phase change materials or other particulate inclusions in cementitious composites

et al. 2017

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“…Decreasing the wt.% of HTPB in fuel compositions showed an improvement in the regression rate (data is provided in supplementary file Table S1). This could be due to the domination of the HTPB fuel vaporization process and controlled entrainment of paraffin liquid droplets to the combustion zone [21]. The power‐law approximation was used to correlate the regression rates of HTPB‐paraffin fuels with average oxidizer mass flux, as seen in equation .

true \dot{r} = a G_{o x}^{n}

…”

Section: Resultsmentioning

confidence: 99%

“…However, the paraffin wax combustion under high‐velocity oxidizer and at high combustion temperature decreases the structural integrity of fuel. To overcome the poor mechanical properties of paraffin‐based fuels, several improvement techniques were adapted [17–22]. Sinha et al.…”

Section: Introductionmentioning

confidence: 99%

Regression Rate Characterization of HTPB‐Paraffin Based Solid Fuels for Hybrid Rocket

Mahottamananda

Kadiresh

Pal

2020

Propellants Explo Pyrotec

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Hybrid rockets are entitled with unique features such as simplicity, thrust modulation, safety, and low cost compared to that of conventional liquid and solid rockets. Despite their distinct advantages, the polymeric solid fuels exhibit a low regression rate, which limits their potential applications for the various space missions. In this study, pure hydroxyl‐terminated polybutadiene (HTPB), paraffin wax, and blended HTPB‐paraffin solid fuels, namely 80P, 60P, 40P, 25P were characterized for ballistic performance. The viscosity, local regression rate, average regression rate and combustion chamber pressure of solid fuels were evaluated on a lab‐scale ballistic motor. It was found that the viscosity of blended fuels decreased with increasing the paraffin wt. % in the formulation. The local regression rates of blended fuels increased in the range of 0.53 mm/s to 1.58 mm/s at oxidizer mass flux range of 85 kg/m2s to 150 kg/m2s. The results indicate that increasing the wt.% of paraffin in the blend will enhance the average regression rate performance, besides suppressing the low‐pressure oscillations during steady‐state operation.

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“…Diversas abordagens têm sido estudadas para viabilizar tecnicamente a propulsão híbrida, entre as quais é possível citar: a) a adoção de blocos combustíveis com múltiplos canais para o escoamento do oxidante, de sorte a aumentar a área exposta à queima e por consequência a vazão mássica de combustível (ALTMAN; HOLZMAN, 2007;PASTRONE, 2012;VEALE et al, 2017 sorte a obter um equilíbrio entre qualidades mecânicas e taxas de regressão aceitáveis (CARDOSO et al, 2017;KIM et al, 2015;MCCULLEY, 2012).…”

Section: Considerações Iniciaisunclassified

“…Estes resultados sugerem que a termogravimetria, a calorimetria exploratória diferencial, a análise termomecânica e a viscosimetria são ferramentas analíticas bastante úteis na elucidação da estrutura e das propriedades térmicas e reológicas das composições polietilenos-parafinas, estas últimas particularmente relevantes à luz da teoria da combustão da camada líquida híbrida (KARABEYOGLU; . Estes estudos também sugerem que composições à base de polietileno de baixa densidade (PEBD) e de parafina macrocristalina têm potencial para aplicação como combustíveis em motores híbridos, não apenas em função de sua compatibilidade química, mas principalmente porque ambos são capazes de formar uma camada hidrodinamicamente instável de combustível fundido (KIM et al, 2010(KIM et al, , 2015MOON;KIM, 2015). Neste contexto, ao contrário do que se verifica em combustíveis formulados apenas com parafinas, o método de preparação destas composições e seus possíveis vínculos com os materiais utilizados e com seu desempenho não têm recebido a necessária atenção (KRUPA; LUYT, 2001a;PISCITELLI et al, 2015;SACCONE et al, 2015;STOBER et al, 2019).…”

Section: Considerações Iniciaisunclassified

Preparação e caracterização de compósitos à base de polietileno, parafina e nitrato de amônio para aplicação em propulsão hibrida

Araújo¹

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Agradeço à minha família, particularmente aos meus avós Hélio (in memoriam)e Clara e à minha tia Lasthenia (in memoriam), cujo apoio, dedicação e exemplos foram e continuam a ser fundamentais em minha vida.Agradeço ao meu orientador, Dr. Ricardo Vieira, pela disponibilidade, pelo estímulo à criatividade e à independência intelectual e pela confiança em mim depositada.Agradeço ao meu co-orientador, Dr. Leonardo Henrique Gouvêa, por me apresentar ao mundo instigante da propulsão híbrida e pelas sugestões pertinentes. Agradeço ao Dr. Leandro José Maschio por todo o apoio prestado ao longo deste trabalho, pelas discussões produtivas e, sobretudo, pela amizade com que me honrou. Agradeço a todos os profissionais do Laboratório Associado de Combustão e Propulsão do Instituto Nacional de Pesquisas Espaciais (LABCP-INPE), cuja colaboração foi essencial para a realização desta Tese, especialmente à Dra.

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Thermal characterizations of the paraffin wax/low density polyethylene blends as a solid fuel

Cited by 44 publications

References 16 publications

A general method for retrieving thermal deformation properties of microencapsulated phase change materials or other particulate inclusions in cementitious composites

A general method for retrieving thermal deformation properties of microencapsulated phase change materials or other particulate inclusions in cementitious composites

Regression Rate Characterization of HTPB‐Paraffin Based Solid Fuels for Hybrid Rocket

Preparação e caracterização de compósitos à base de polietileno, parafina e nitrato de amônio para aplicação em propulsão hibrida

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