Research Progresses of Flash Evaporation in Aerospace Applications

Ma, Wei; Zhai, Siping; Zhang, Ping; Xian, Yaoqi; Zhang, Lína; Shi, Rui; Sheng, Jiang; Liu, Bo; Wu, Zhuang

doi:10.1155/2018/3686802

Cited by 16 publications

(5 citation statements)

References 60 publications

(67 reference statements)

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“…The flash evaporation process involves intense heat transfer and phase change, resulting in high heat flow density, quick evaporation speed, and full utilization of the work material's latent heat. This technique has been widely used in several sectors, including spacecraft cooling [2], pharmaceutical drying [3], electronic components [4], and saltwater desalination [5]. Because of the low natural pressures in the areas where it is utilized, flash vaporization technology has attracted a lot of interest, especially in aircraft applications.…”

Section: Extended Abstractmentioning

confidence: 99%

Experimental Study of the Cooling Properties in Low-Pressure Flash Evaporation

Quan,

Chai,

Yin

et al. 2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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Section: Extended Abstractmentioning

confidence: 99%

Experimental Study of the Cooling Properties in Low-Pressure Flash Evaporation

Quan,

Chai,

Yin

et al. 2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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“…This is referred to as an EHD extraction phenomenon (EHD-EP) [17,18], which is the target of the present research from a viewpoint of the condensation heat transfer enhancement, flash evaporation, moisture control in liquids etc. [19][20][21]. The electrode configuration used in this study does not have any sharp edges and the behavior of liquid is opposite to the motion of the above-mentioned Taylor cone-jet.…”

Section: Introduction mentioning

confidence: 99%

Dynamic Behavior and Its Consideration of EHD Liquid Extraction Phenomenon Causing under DC or Low-Frequency AC Voltage

Hanaoka¹,

Fujita²,

Kajiura³

et al. 2019

JEPE

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This paper describes an experimental and theoretical study on an extraction phenomenon of liquids occurring at an air gap between the liquid surface and the electrode by applying a direct current (DC) or low-frequency alternating current (AC) voltage. Three liquids with a different physical property; 2,3-dihydrodecafluoropenten, palm fatty acid ester oil and crude rapeseed oil are used as working liquids. The electrode configuration is the sphere or plane (high voltage electrode) to grounded plane electrode. The grounded plane electrode is fixed to the bottom of the test vessel with working liquid and the high voltage electrode is installed in an air above the liquid surface against the grounded plane electrode. The liquid surface swells towards the high voltage electrode by the increase of voltage and the liquid is extracted in a short time, thereafter the air gap between the liquid surface and the high voltage electrode is bridged at a thick liquid column. Such the liquid behavior displays unique features with voltage polarity effect for each working liquid. The relationship between the applied voltage, current variation, height of swollen liquid, force pulling liquid and dynamic feature of liquid is examined experimentally. The liquid behavior is considered theoretically based on experimental observations. Key words: Electrohydrodynamics (EHD) extraction phenomenon, semi-insulating and insulating liquids, DC or low-frequency AC voltage, dynamic behavior of liquids, moisture removal effect in oil.

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“…Flashing flows are encountered in a variety of technical applications, having both beneficial and harmful impacts. Owing to its high heat removal capacity and unique advantages under vacuum conditions, flash evaporation is increasingly used as an alternative cooling method, e.g., in the spacecraft thermal control systems [2][3][4]. High-pressure liquid is sprayed into a low-pressure environment, and flash evaporation takes place.…”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of Phase Change during the Flashing-Induced Instability in a Natural Circulation Circuit

Liao

Lucas

2023

Processes

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Flashing-induced instability (FII) has a significant impact on the safe operation of a natural circulation circuit, a phenomenon frequently encountered in the cooling systems of advanced light water reactors. While one-dimensional system codes are commonly used for the engineering design and safety analysis of FII, there is a strong academic interest in understanding the underlying physical mechanisms. To address this, high-resolution computational fluid dynamics (CFD) simulations serve as a valuable tool. However, the current state of CFD modeling for two-phase flows with phase change, which are particularly highly transient fluctuating flashing flows, is still in its early stages of development. In this study, we establish a CFD model that focuses on interphase heat transfer to analyze the phase change during FII. By incorporating experimental data from the literature, we investigate the transient flow field and thermodynamic behavior in the riser of the GENEVA test facility. The study provides valuable insights into the non-equilibrium and interfacial transfer phenomena during the phase change as well as the effect of high-frequency fluctuation. Additionally, we discuss in detail the challenges associated with FII modeling and the limitations of the current model. We also provide suggestions for potential improvements in future numerical studies. The results show that the thermal phase change and heat transfer coefficient model adopted for the simulation reasonably captures the evaporation and condensation process. However, it tends to under-predict the evaporation rate, which results in a larger pressure drop through the riser. The observation that the void fraction close to the wall is higher than that in the riser center evidences that the reliable modeling of bubble size distribution as well as the inclusion of non-drag forces are important for predicting the transverse void distribution. Furthermore, it reveals that both the temperature and pressure change in an FII, and their effects on phase change should be taken into account simultaneously.

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Research Progresses of Flash Evaporation in Aerospace Applications

Cited by 16 publications

References 60 publications

Experimental Study of the Cooling Properties in Low-Pressure Flash Evaporation

Experimental Study of the Cooling Properties in Low-Pressure Flash Evaporation

Dynamic Behavior and Its Consideration of EHD Liquid Extraction Phenomenon Causing under DC or Low-Frequency AC Voltage

CFD Modeling of Phase Change during the Flashing-Induced Instability in a Natural Circulation Circuit

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