Evaporation issues of acoustically levitated fuel droplets

Yang, Guangcan; Yang, Zhaochu; He, Yongqing; Shi, Zhongyuan; Dong, Tao

doi:10.1016/j.ultsonch.2023.106480

Cited by 3 publications

(2 citation statements)

References 111 publications

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“…Besides, the technique also solves the extreme heat dissipation of ultrahigh-power devices. , As the basis of spray, a single droplet is a simple alternative method to study spray. Suspension method, − free fall method, hot plate method, , and ultrasonic levitation are usually used to study the evaporation characteristics of a single droplet. These four methods have their own advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Evaporation Behavior of a Single Isobutane Droplet in the Effluent Spray Process of Isobutane Alkylation Catalyzed by Composite Ionic Liquid

Han,

Zhang,

Meng

et al. 2024

Ind. Eng. Chem. Res.

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Isobutane alkylation catalyzed by a composite ionic liquid is a new technology for the production of clean gasoline blending components. In this process, efficient effluent cooling plays a crucial role in energy conservation. A new cooling application by effluent (mainly isobutane) evaporation was proposed for this target, in which the effluent was released into a low-pressure environment to enhance and control the evaporation of isobutane. The transient temperature of isobutane droplets was measured by suspending them on the tip of a thermocouple while a high-speed camera recorded the evaporation process. The effects of final pressures, different initial droplet diameters, initial droplet temperatures, and gas concentrations of isobutane on evaporation behavior and droplet temperature were investigated. The results demonstrated that isobutane droplets underwent intense evaporation and stable evaporation phases. The evaporation rate constant (k 0 ) exhibited a linear increase with decreasing final pressure and increasing initial droplet diameter. With the decrease in k 0 , the droplet evaporated in three states: expansion and breaking, only expanding but not disintegrating, and surface evaporation. The evaporation rate constant (k 1 ) during the stable evaporation phase was influenced by the initial droplet diameter and the concentration gradient between the droplet and the environment due to the concentration difference around the droplet. The lower the final pressure, the lower the droplet temperature in the stable evaporation stage, and the droplet diameter and initial temperature did not appear to affect the droplet equilibrium temperature. Adjusting the final pressure allows for precise control of the temperature of the droplets during the stabilization phase of evaporation.

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Section: Introductionmentioning

confidence: 99%

Evaporation Behavior of a Single Isobutane Droplet in the Effluent Spray Process of Isobutane Alkylation Catalyzed by Composite Ionic Liquid

Han,

Zhang,

Meng

et al. 2024

Ind. Eng. Chem. Res.

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“…Ultrasound has several unique features in terms of ease of operation, flexible control, strong penetrability, and good biocompatibility. It has been widely used in material processing, medical diagnosis, weapons, defect detection, and other fields [ 8 , 9 , 10 , 11 , 12 ]. In recent years, ultrasound used for cooling have been proposed by many researchers [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Cooling Performance of a Focused Ultrasonic Radiator for Electrical Heating Elements

Su,

Wang,

Zheng

et al. 2024

Micromachines

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In this work, a focused ultrasonic radiator is proposed for cooling the electrical heating elements in the focal region, and its working characteristics are investigated. The analyses of the FEM computational and flow field visualization test results indicate that focused ultrasound can generate forced convective heat transfer by the acoustic streaming in the focal region, which can cool the heating elements effectively. Experiments show that when the input voltage is 30Vp-p and the ambient temperature is 25 °C, the focused ultrasonic radiator can cause the surface temperature of the heating element (high-temperature alumina ceramic heating plate with a diameter of 5 mm) in the focal region to drop from 100 °C to about 55 °C. When the diameter of the electrical heating element is changed from 5 mm to 30 mm, the cooling effect is similar in the focal region. Compared with a fan, the focused ultrasound radiator has a shorter cooling time and a more concentrated cooling area. The focused ultrasonic radiator proposed in this work is suitable for some special environments.

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