Thermal stability of foams stabilized by fluorocarbon and hydrocarbon surfactants in presence of nanoparticles with different specific surface areas

Sheng, Youjie; Peng, Yunchuan; Zhang, Shanwen; Guo, Ying; Ma, Li; Zhang, Hanling

doi:10.1016/j.molliq.2022.120187

Cited by 28 publications

(6 citation statements)

References 53 publications

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“…On the other hand, closed pores can resist the increase in heat exchange frequency between liquid and gaseous phases in the conductive path, reducing thermal conductivity. Fine-pored and highly porous structures tend to increase the number of heat transfer paths, which can decrease thermal conductivity [48]. This is due to the increase in heat transfer resistance, which reduces heat transfer efficiency and the occurrence of the 'thermal bridge' effect [49].…”

Section: Thermal Conductivitymentioning

confidence: 99%

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Bai,

Xie,

Chen

2024

Preprint

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Solid waste recycling plays a crucial role in environmental protection and energy conservation. This study explores the utilization of rice husk ash as an auxiliary binding material in the production of alkali-activated foamed concrete. The impact of the modulus of the alkaline activator on the dry density, water absorption rate, thermal conductivity, electromagnetic wave absorption, and compressive and flexural strength of rice husk ash-foamed concrete was investigated. Additionally, the foamed concrete's micro-pore structure and hydration characteristics were characterized. For the first time, the study reveals the correlation between the pore structure, hydration products, and hardening properties of alkali-activated rice husk ash-foamed concrete. The results demonstrate that with a decrease in the modulus of the alkaline activator, the presence of accessible OH- ions in the colloid increases, leading to an improvement in the pore structure of alkali-activated rice husk ash-foam concrete and an increase in hydration products. The reduction in interconnected pores, increase in tiny pores, and higher C-S-H gel and ettringite content in the hydration products directly impact the development of concrete strength, reduction in dry density and water absorption rate, and decrease in thermal conductivity. Alkaline activation, through optimizing the pore structure, enhances the attenuation constant and impedance matching of the alkali-activated rice husk ash-foam concrete matrix, enhancing its electromagnetic wave absorption capability. In conclusion, the overall results suggest that alkali-activated rice husk ash-foam concrete is a viable material for energy-efficient and environmentally friendly construction.

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Section: Thermal Conductivitymentioning

confidence: 99%

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Bai,

Xie,

Chen

2024

Preprint

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“…The LSRs of the AF and A foams at 35 kW/m 2 are 0.06 g/s at 38 s and 0.025 g/s at 80 s. And the LSR of the AR foam is 0.01 g/s at 151 s, which is obviously lower than that of the AF and A foams. Therefore, the liquid separation rate of the solution is related to the properties of the foam itself, such as viscosity and surface/interface tension, which are relatively independent of the external radiation heat flux of the foam [31][32][33][34]. The influence of the radiation value on the liquid separation rate of the AF, AR, and A foams is shown in Figure 2.…”

Section: Effect Of Thermal Radiation On the Foam Stabilitymentioning

confidence: 99%

The Influence of the Heat Transfer Mode on the Stability of Foam Extinguishing Agents

Zhou,

An,

Liu

et al. 2024

Fire

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The mass loss mechanisms of an aqueous film-forming foam (AF foam), an AR/AFFF water-soluble film-forming foam extinguishing agent (AR foam), and a Class A foam extinguishing agent (A foam) at different levels of thermal radiation, thermal convection, and heat conduction intensity were studied. At a relatively low thermal radiation intensity, the liquid separation rate of the AF, AR, and A foams is related to the properties of the foam itself, such as viscosity and surface/interface tension, which are relatively independent of the external radiation heat flux of the foam. At low radiation intensity (15 kW/m2 and 25 kW/m2), the liquid separation rate of the AF and A foams is relatively stable. When the heat flux intensity is 35 kW/m2, the liquid separation rate of the AF and A foams increases notably, which may be mainly due to the rapid decrease in foam viscosity. And the mass loss behavior is dominated by liquid separation in the AF, AR, and A foams under the influence of thermal radiation and thermal convection. Under the same experimental conditions, the liquid separation rate of AF is the fastest. There is no significant difference in the evaporation rates of the three kinds of foam in the same heat conduction condition. In addition, the AR and A foams usually have a 25% longer liquid separation time (t) under thermal radiation and thermal convection, and the thermal stability is better than AF foam. The temperature reached by the AF foam layer under thermal convection was lower than that of the AR and A foams, and the time for the foam layer to reach the highest temperature under heat conduction was longer than that of the AR and A foams.

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“…[149]. In another study [150], the thermal stability of foams stabilized with mixed dispersions of SiO2 nanoparticles, nonionic surfactants, and fluorocarbon surfactants was investigated. The results showed that nanoparticles can prevent foam decay, drainage, and coarsening under heat, enhancing foam thermal stability.…”

Section: Figure 13: Illustration Of the Three Mechanisms Of Injection...mentioning

confidence: 99%

Optimizing Oil Recovery: A Comprehensive Review of Foam Applications in Enhanced Oil Recovery.

SAKHI

2024

Preprint

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As global oil demand continues to rise and operators scale back on exploration investments, the adoption of enhanced oil recovery (EOR) technology is becoming increasingly essential. This approach strategically aims to optimize reserves in existing fields, maximizing production through efficient processes. In recent years, there has been a notable surge in the adoption of foam applications in EOR. These foam applications are particularly effective in managing gas mobility in injector wells and preventing gas blockages in production wells. The use of foam has proven to be an effective method for addressing reservoir heterogeneity concerns, including viscosity fingering, gravity segregation, and channeling. These solutions maintain operational stability while improving the efficiency of oil recovery. However, persistent challenges remain ongoing, such as foam solution quality, foamability, stability under high pressures and temperatures, and interactions with the oil phase. Thus, ongoing research and development are crucial to overcome these challenges and optimize the use of foam in enhanced oil recovery. This paper aims to comprehensively review and synthesize the most pertinent studies on foam-based enhanced oil recovery (EOR). The study thoroughly investigates the factors that affect foam stability and efficiency, offering a comprehensive understanding of foam generation in porous media. The paper review identifies knowledge gaps and proposes methods to incorporate physical understandings of experiments into assessments of foam project performance. The paper explores the applications of foam in laboratory and field settings, highlighting recent advancements in improving foam stability.

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Thermal stability of foams stabilized by fluorocarbon and hydrocarbon surfactants in presence of nanoparticles with different specific surface areas

Cited by 28 publications

References 53 publications

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

The Influence of the Heat Transfer Mode on the Stability of Foam Extinguishing Agents

Optimizing Oil Recovery: A Comprehensive Review of Foam Applications in Enhanced Oil Recovery.

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