Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

Kawanami, Osamu; Hara, Yasuhiko; Takagaki, Naohisa; Honda, Itsuro

doi:10.1299/transjsme.19-00216

Cited by 1 publication

(3 citation statements)

References 10 publications

(9 reference statements)

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“…As previously mentioned, the temperature field of co-boiling between NAPL and water deviates from the theoretical value under thermodynamic equilibrium conditions. These literatures have provided further evidence supporting the tendency to deviate from phase equilibrium characteristics during co-boiling of immiscible fluids. ,, Our observations of the bubble behavior in NAPL–water combinations through our experiments further prove this point. For more information, refer to S4.…”

Section: Resultssupporting

confidence: 84%

“…These literatures have provided further evidence supporting the tendency to deviate from phase equilibrium characteristics during coboiling of immiscible fluids. 28,34,35 Our observations of the bubble behavior in NAPL−water combinations through our experiments further prove this point. For more information, refer to S4.…”

Section: Coboiling Between Napl and Watersupporting

confidence: 74%

“…However, it is important to note that the temperature field of the subsurface is transient and has a significant temperature gradient over time during ISTD. This may lead to deviations from theoretical analysis of co-boiling under thermal equilibrium conditions, particularly in instances of rapid heating or when there is a substantial temperature difference between the solid matrix and fluid. ,− Regarding heat transfer during boiling, researchers have conducted numerous studies to explore heat and mass transfer in boiling of immiscible fluids toward thermal management of electronic devices. , − A series of theoretical studies on the boiling and heat transfer of immiscible liquids have also been conducted, ,− including the evolution of the vapor layer and the formation rate and diameter of bubbles. These works focus on bubble behaviors, heat flux density, and heat transfer coefficient toward the application of equipment cooling but lack attention to temperature field variations as well as NAPL removal rates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Understanding of Co-boiling between Organic Contaminants and Water during Thermal Remediation: Effects of Nonequilibrium Heat and Mass Transport

Xu,

Hu,

Qian

et al. 2023

Environ. Sci. Technol.

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In situ thermal desorption (ISTD) provides an efficient solution to remediation of soil and groundwater contaminated with nonaqueous phase liquids (NAPLs). Establishing a relationship between the subsurface temperature rise and NAPL removal is significant to reduce energy consumption of ISTD. However, the co-boiling phenomenon between NAPL and water poses a great challenge in developing this relationship due to the nonequilibrium heat and mass transport effects. We performed a systematic experimental investigation into the local temperature rise patterns at different distances from a NAPL pool and under different degrees of superheat by selecting four representative NAPLs (i.e., trichloroethylene, tetrachlorethylene, n-hexane, and noctane) according to their density and boiling point relative to water. The patterns of temperature rise indicated that the underground temperature field can be divided into three zones: the zone of local thermal equilibrium, the nonequilibrium zone affected by co-boiling, and the zone unaffected by co-boiling. We developed a pattern-recognition-based approach, which considers the effects of local heat and mass transport to establish a qualitative correlation between the temperature rise and NAPL removal. Our results give deeper insights into the understanding of subsurface temperatures in ISTD practice, which can serve as the guideline for more accurate and sustainable remediation.

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Section: Resultssupporting

confidence: 84%

Section: Coboiling Between Napl and Watersupporting

confidence: 74%