Heat Transfer in Boiling of Immiscible Mixtures

Yamasaki, Y.; Kita, Shota; Iwata, Keisuke; Shinmoto, Yasuhisa; Ohta, Hiroyuki

doi:10.1615/interfacphenomheattransfer.2015012699

Cited by 4 publications

(7 citation statements)

References 12 publications

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“…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: 76%

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: Coboiling Between Napl and Watersupporting

confidence: 76%

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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“…The values of ξ near unity are clear from Figure 6. The distribution of liquid FC72 relative to the location of the surface for heat transfer is quite different between a round tube (Yamasaki et al, 2015) and a rectangular channel. Because of higher density of liquid FC72 than water, most part of heat is transferred directly to FC72 from the heating surface located at the bottom of channel at least for a large gap size.…”

Section: Evaluation Of Fluid Temperature Distribution In Flow Directionmentioning

confidence: 97%

“…To apply the conventional energy balance method, three different regions are taken into account depending on the outlet state of mixtures. Along the manner for a round tube (Yamasaki et al, 2015), the uniform temperature across every cross section of the channel is assumed again. Three regions are classified by the different states of more-volatile component, FC72, while the less-volatile component, water, is assumed to be subcooled liquid for all regions.…”

Section: Evaluation Of Fluid Temperature Distribution In Flow Directionmentioning

confidence: 99%

“…However, for practical applications, the system of flow boiling is more general and useful, because it separates the location of final heat dissipation, i.e., condenser section, from the location of heat generation, i.e., cold plate. By a part of present authors, flow boiling of immiscible mixture in a round tube was investigated (Yamasaki et al, 2015;Ohta et al, 2016). The experiments were performed by using a horizontal heated tube with an inner diameter of 7 mm and a heated length of 310 mm.…”

mentioning

confidence: 99%

“…The local heat transfer coefficients along the tube axis were measured by using an immiscible mixture of FC72/water under the conditions of pressure 0.1 MPa, inlet temperature 47°C, and total flow rate of 0.5 L/min. Before heating, flow pattern of liquid-liquid and vapor of the components , (B) enhancement of heat transfer due to forced convection of water by nucleate boiling of FC72 observed in flow boiling experiments using a round tube (Yamasaki et al, 2015), (c) dominating force regime map by Bond, Weber and Froude numbers, obtained from flow boiling experiments using mini-tubes with different orientations (Baba et al, 2012).…”

mentioning

confidence: 99%

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Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

et al. 2017

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The use of immiscible liquids for cooling of surfaces with high heat generation density is proposed based on the experimental verification of its superior cooling characteristics in fundamental systems of pool boiling and flow boiling in a tube. For the purpose of practical applications, however, heat transfer characteristics due to flow boiling in narrow rectangular channels with different small gap sizes need to be investigated. The immiscible liquids employed here are FC72 and water, and the gap size is varied as 2, 1, and 0.5 mm between parallel rectangular plates of 30 mm × 175 mm, where one plate is heated. To evaluate the effect of gap size, the heat transfer characteristics are compared at the same inlet velocity. The generation of large flattened bubbles in a narrow gap results in two opposite trends of the heat transfer enhancement due to thin liquid film evaporation and of the deterioration due to the extension of dry patch in the liquid film. The situation is the same as that observed for pure liquids. The latter negative effect is emphasized for extremely small gap sizes if the flow rate ratio of more-volatile liquid to the total is not reduced. The addition of small flow rate of less-volatile liquid can increase the critical heat flux (CHF) of pure more-volatile liquid, while the surface temperature increases at the same time and assume the values between those for more-volatile and less-volatile liquids. By the selection of small flow rate ratio of more-volatile liquid, the surface temperature of pure less-volatile liquid can be decreased without reducing high CHF inherent in the less-volatile liquid employed. The trend of heat transfer characteristics for flow boiling of immiscible mixtures in narrow channels is more sensitive to the composition compared to the flow boiling in a round tube.

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Non-intrusive diagnostics of differentially-heated two-component immiscible fluid layer with phase change

Kumar

Hinduja

Srivastava

2023

International Communications in Heat and Mass Transfer

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Heat Transfer in Boiling of Immiscible Mixtures

Cited by 4 publications

References 12 publications

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

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

Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

Non-intrusive diagnostics of differentially-heated two-component immiscible fluid layer with phase change

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