Enhancement of forced and free convection heat transfer rates by inducing liquid–liquid phase separation of a partially-miscible equal-density binary liquid system

Ullmann, Amos; Maevski, Konstantin; Brauner, Neima

doi:10.1016/j.ijheatmasstransfer.2013.11.006

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…20(b)], the decreasing trend at high flow rates is attributed to the decrease of the residence time in the test section. This effect becomes pronounced already at lower flow rates in the heat exchanger experiments where the inlet temperatures were higher, well above the UCST (see also Ullmann et al, 2014a).…”

Section: Fig 24mentioning

confidence: 90%

“…The reported results correspond to 6LQJOH 3KDVH steady-state conditions, which are typically achieved after at least five liquid volume replacements in the pipe. More details on the experimental setup and the experimental procedure can be found at Ullmann et al (2014a).…”

Section: Experiments With Ucst Systemsmentioning

confidence: 99%

“…T in , T out , T w , and T cp are the liquid inlet, liquid outlet, wall, and the cloud point (phase transition) temperatures, respectively; Ja = (C p ) mix (T cp -T w )/∆h mix|T w and Gz = Pe (D/L). Ullmann et al (2009Ullmann et al ( , 2014a reasoned that the last two terms on the right-hand side of Eq. (21) represent the heating rate and the depth (in terms of temperature) of the penetration into the unstable region of the coexistence curve.…”

Section: Experiments With Lcst Systemsmentioning

confidence: 99%

“…To overcome the above limitations of boiling in small-diameter pipes, while preserving the "pumping" effect, the possibility of using phase separation of liquid solutions, instead of evaporating systems, for enhancing heat transfer rates has been investigated independently by our research groups (e.g. Poesio et al, 2007;Gat et al, 2006, Di Fede et al 2012, Ullmann et al 2014a.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Heat Transfer Rates by Inducing Liquid-Liquid Phase Separation: Applications and Modeling

Ullmann

Poesio

Brauner

2015

Interfac Phenom Heat Transfer

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This paper focuses on heat transfer enhancement during spinodal decomposition, and it provides an updated review as well as a discussion of future developments. The analysis is mainly based on the work of two research groups at Tel-Aviv University (Israel) and at University of Brescia (Italy). We review the theory of spinodal decomposition of liquid-liquid binary mixtures and we discuss the diffuse interface (DI) approach. While mass and momentum equations in the DI approach have been developed and discussed in other works, we also look into the energy equation, which has been only recently investigated. Direct visualizations of both static and flowing mixture during decomposition are provided. Visualizations of the decomposition in a quiescent fluid have been previously reported, while flowing conditions have been analyzed only recently. Interestingly enough, the morphology is rather different during flowing conditions, where the decomposition exhibits a nucleationlike morphology and not the typical bicontinuous structure observed during spinodal decomposition of a quiescent fluid. Enhancement of heat transfer performances is shown in channels (sizes of 0.8 and 2 mm) using an upper critical solution temperature (UCST) mixture. Although different conditions are analyzed, the results show a consistent enhancement of the heat transfer. The paper reports also some new experimental work on the heat transfer for a lower critical solution temperature (LCST) mixture that can be actually used in cooling applications. A coarse-grained model that could be potentially used for the sizing of large-scale equipment is discussed in term of a possible future development that needs to be further investigated and validated.

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Section: Fig 24mentioning

confidence: 90%

Section: Experiments With Ucst Systemsmentioning

confidence: 99%

Section: Experiments With Lcst Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing Heat Transfer Rates by Inducing Liquid-Liquid Phase Separation: Applications and Modeling

Ullmann

Poesio

Brauner

2015

Interfac Phenom Heat Transfer

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“…Using this solution as a flowing medium in microchannels can effectively enhance the heat transfer coefficient. Ullmann et al 3 studied the flow heat transfer behavior of the watertriethylamine solution in a 4 mm diameter circular tube. They found that the heat transfer coefficient of the solution was 3−8 times higher than that of water under the same conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

Effects of Inorganic Salts on the Phase Separation of Partially Miscible Solutes

Zhao,

Ding,

Zhu

et al. 2024

Langmuir

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Partially miscible solutions with a lower critical solution temperature have promising applications in the field of physical chemistry. To better guide the utilization of these solutions in practice, we conduct an in-depth study about the phase separation behavior of the solution added with inorganic salts. The addition of the inorganic salts into the solution is found to consequently reduce the phase separation temperature. The variation of concentrations of inorganic salts does not notably affect the mass fraction of the separation. Moreover, the addition of inorganic salts in the solutions at lower mass fractions improves the separation mass fraction, while the addition of inorganic salts decreases the separation mass fraction at the mass fractions above 30%. It sheds light on selecting the proper mass fractions and inorganic salt concentrations. Furthermore, we explore the phase separation behavior of mixed solutions under different inorganic salt additions by means of a high-speed camera. The phase separation behavior under different inorganic salt systems shows a similar trend. However, calcium ions and Fe3+ ions in the solutions can greatly decrease the rate of droplet coalescence and result in an increase in phase separation. For better regulating the solutions with a lower critical solution temperature through inorganic salts, sodium chloride or potassium chloride is recommended with an appropriate concentration.

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Heat transfer under high-power heat release: Not fully stable fluids as potential heat carriers

Igolnikov

Rutin

Скрипов

2022

Applied Thermal Engineering

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Enhancement of forced and free convection heat transfer rates by inducing liquid–liquid phase separation of a partially-miscible equal-density binary liquid system

Cited by 9 publications

References 12 publications

Enhancing Heat Transfer Rates by Inducing Liquid-Liquid Phase Separation: Applications and Modeling

Enhancing Heat Transfer Rates by Inducing Liquid-Liquid Phase Separation: Applications and Modeling

Effects of Inorganic Salts on the Phase Separation of Partially Miscible Solutes

Heat transfer under high-power heat release: Not fully stable fluids as potential heat carriers

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