Liquid/liquid phase separation heat transfer at the microscale

Wei, Xing; Vutha, Ashwin Kumar; Yu, Xueli; Ullmann, Amos; Brauner, Neima; Peles, Yoav

doi:10.1016/j.ijheatmasstransfer.2016.11.028

Cited by 17 publications

(9 citation statements)

References 40 publications

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“…The heating rate varies when the 2-Butoxyethanol/water solution flows in microchannels due to the massive matching schemes between the flow rate and heating power. Considering the heat transfer rate in the microchannel [32], the mass fraction and heating rate were set as 27.4% and 1~5 °C•s -1 respectively to investigate the influence of heating rate on the liquid-liquid phase separation mechanism. Fig.…”

Section: Effect Of Heating Rate On Phase Separation Mechanismmentioning

confidence: 99%

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Microscopic Exploration of Liquid-liquid Phase Separation Mechanism in LCST Solutions

Ding¹,

Feng²,

Yuan³

et al. 2022

ES Energy Environ.

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A partially miscible solution with a lower critical solution temperature (LCST) is a potential coolant for microchannel heat sinks to meet the multi-goals of high cooling performance, low-pressure drop and stable operation. However, it is a great challenge to fundamentally understand the liquid-liquid phase separation mechanism, and to harvest benefits from it for evaluating the cooling performance and regulating the flow pattern of the LCST solutions in microchannels. Here, we observed and explained the liquid-liquid phase separation behaviors of 2-Butoxyethanol/water solutions with various mass fractions (ωp) and heating rates, consisting of spinodal decomposition or nucleation, droplet growth (diffusion-driven), and droplet coalescence (convectiondriven, stage Ⅰ and stage Ⅱ). The results proved that the separated molecular cluster is covered with a layer of water molecules, causing the mass fraction of 2-Butoxyethanol in the separated liquid to be 65.4% instead of 100%. To keep a mist or droplet flow pattern in microchannels, some efforts must be made to reduce the droplet diameter and suppress the droplet coalescence in stage Ⅱ. Although the solutions with better cooling performance have been determined at ωp=27.4%~35%, future works should focus on whether the liquid-liquid phase separation ends at the droplet growth stage or coalescence stage.

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Section: Effect Of Heating Rate On Phase Separation Mechanismmentioning

confidence: 99%

“…Generally, the liquid-liquid phase separation consists of spinodal decomposition and nucleation, which depends on the mass fraction of solute in water [32]. Specifically, the spinodal decomposition can only be observed in LCST solutions with a critical mass fraction.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Exploration of Liquid-liquid Phase Separation Mechanism in LCST Solutions

Ding¹,

Feng²,

Yuan³

et al. 2022

ES Energy Environ.

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“…New knowledge obtained for the properties of not fully stable liquids and the revealed fact of the confinement of their relaxation to an equilibrium state with respect to time have found application in novel engineering solutions. These solutions are generally connected with developing technologies for supercritical heat transfer in power generation (especially for 4th generation nuclear reactors in which supercritical water is used as a heat carrier [22,23]) and converting phase transition energy into transport fluids at the microscale [24,25]. In this connection, inkjet printers [26], bubble pumps [27], and fuel transmission and fire-extinguisher technologies [28,29] may be mentioned, as well as various bio-medical applications [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…Relaxation of the solution to a stable state is carried out through nucleation or spinodal decomposition [9,39]. A visualization of the spinodal decomposition process can be found elsewhere [25]. As in the case of the liquid-vapor critical state (see Sections 3.2 and 3.3), the properties of solutions in the vicinity of the liquid-liquid critical point undergo anomalous changes (see Section 3.1).…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Liquids in Not Fully Stable States—From the First Steps to the Current Trends

Скрипов

2022

Energies

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The present article marks the 95th anniversary of the birth of Vladimir P. Skripov, author of the classic study of superheated and supercooled liquids. It presents a discussion based on the early work carried out by Skripov and his research team in Ekaterinburg during the 1950s and 1960s. Due to their pioneering nature, these works laid the foundation for the study of metastable liquid states. For various reasons, although they remain relevant to this day, these groundbreaking works remain unknown to most non-Russian-speaking readers. As well as elucidating the behavior of the heat capacity of a solution in the liquid–liquid critical region, the presented research also concerns the characteristic features of light scattering and free-convective heat transfer in the liquid–vapor critical region of a one-component system, discussing two options for the position of the superheated liquid spinodal on the phase diagram of water, including the area of supercooled states and negative pressures. The issues involved in the discussion are united by the fluctuating nature of such phenomena. Indeed, the very possibility of their experimental study is due to a significant increase in the scale of fluctuations of the corresponding quantities when approaching the critical point or spinodal. The ongoing development of the approaches proposed in these papers for solving contemporary problems in the thermophysics of superheated liquids is discussed.

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“…Xing et al . first introduced phase separation cooling at micro-scale, and provided experimental evidence for improved heat transfer coefficient 18 . Based on the existing studies, more work needs to be conducted to assist more in-depth understanding of the micro-scale phase separation heat transfer, i.e.…”

Section: Introductionmentioning

confidence: 99%

Advancing micro-scale cooling by utilizing liquid-liquid phase separation

Wei

Ullmann

Brauner

et al. 2018

Sci Rep

Self Cite

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Achieving effective cooling within limited space is one of the key challenges for miniaturized product design. State-of-the-art micro-scale cooling enhancement techniques incorporate flow disturbances and boiling to reach high performance. However, these methods face the inherent issues of extra pressure drop, flow instability and dry-out that limits heat flux. Here we demonstrate that substantial cooling capability enhancement, up to 2.5 times, is realized by introducing the phase separation of a triethylamine (TEA)/water mixture at the micro-scale. Our experiments show that the enhancement behavior is closely related to the system’s initial composition, temperature, and flow conditions. Moreover, the mixture system exhibits reduced pressure drop after separation, which makes it more promising in serving practical applications. The results reveal new possibilities for liquid coolant selection and provide the experimental foundation for further research in this area.

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Liquid/liquid phase separation heat transfer at the microscale

Cited by 17 publications

References 40 publications

Microscopic Exploration of Liquid-liquid Phase Separation Mechanism in LCST Solutions

Microscopic Exploration of Liquid-liquid Phase Separation Mechanism in LCST Solutions

Thermophysical Properties of Liquids in Not Fully Stable States—From the First Steps to the Current Trends

Advancing micro-scale cooling by utilizing liquid-liquid phase separation

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