Passive mixing rate of trapped squeezed nanodroplets—A time scale analysis

Karbalaei, Alireza; Cho, Hyoung J.

doi:10.1007/s42757-019-0044-8

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…When the layer of liquid covering the wall evaporates, it dries up and that goes with a sharp decrease in the heat transfer coefficient, which leads to an increase in the bulk temperature of the wall. Heat fluxes corresponding to these modes are outside the range which is typical for engine cooling systems [60,82,124,160].…”

Section: Fluid Boiling In the Cooling Jacket Of The Engine Cylinder Headmentioning

confidence: 95%

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

et al. 2021

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The article is devoted to the following issues: boiling of fluid in the cooling jacket of the engine cylinder head; agents that influenced the thermal conductivity coefficient of nanofluids; behavior of nanoparticles and devices with nanoparticles in the engine’s cylinder head cooling system. The permissible temperature level of internal combustion engines is ensured by intensification of heat transfer in cooling systems due to the change of coolants with “light” and “heavy” nanoparticles. It was established that the introduction of “light” nanoparticles of aluminum oxide into the water in a mass concentration of 0.75% led to an increase in its thermal conductivity coefficient by 60% compared to the base fluid at a coolant temperature of 90 °C, which corresponds to the operating temperature of the engine cooling systems. At the indicated temperature, the base fluid has a thermal conductivity coefficient of 0.545 W/(m °С), for nanofluid with particles its value was 0.872 . At the same time, a positive change in the parameters of the nanofluid in the engine cooling system was noted: the average movement speed increased from 0.2 to 2.0 m/s; the average temperature is in the range of 60–90 °C; heat flux density 2 × 102–2 × 106 ; heat transfer coefficient 150–1000 . Growth of the thermal conductivity coefficient of the cooling nanofluid was achieved. This increase is determined by the change in the mass concentration of aluminum oxide nanoparticles in the base fluid. This will make it possible to create coolants with such thermophysical characteristics that are required to ensure intensive heat transfer in cooling systems of engines with various capacities.

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Section: Fluid Boiling In the Cooling Jacket Of The Engine Cylinder Headmentioning

confidence: 95%

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

et al. 2021

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“…[12,13] Researchers have demonstrated such low-cost devices for various applications. [14][15][16][17][18][19] However, the centralized fabrication process of these devices is still a prevalent limitation.…”

Section: Laserjet Printed Micro/nano Sensors and Microfluidic Systems: A Simple And Facile Digital Platform For Inexpensive Flexible And mentioning

confidence: 99%

Laserjet Printed Micro/Nano Sensors and Microfluidic Systems: A Simple and Facile Digital Platform for Inexpensive, Flexible, and Low‐Volume Devices

Bamshad

Cho

2021

Adv Materials Technologies

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A facile and digital do‐it‐yourself technique is proposed to fabricate inexpensive sensors on flexible substrates (paper, cloth, and plastic film). A set of office‐grade equipment (i.e., laserjet printer, thermal laminator, computer‐aided paper cutter), and commercially available supplies (i.e., baking wax paper, furniture restoration metal‐leaf) are used. Forming electrodes through traditional printing and defining a fluidic confinement region through crafting practice enable fabrication of a wide range of devices without requiring customized specialty instruments, costly infrastructure, and complicated fabrication steps, unlike previously introduced methods. Three different levels of experiments are designed to assess the comprehensiveness and responsiveness of the proposed method to the needs of existing research fields. The performances of the fabricated features at each level are evaluated to cover various application domains in environmental monitoring and biomedical diagnostics utilizing conductometric, colorimetric, biochemical, and chemoresistive detection principles. Devices with varying size of features, from nanometers to centimeters, are fabricated and characterized. This method provides an alternative route to decentralized production of low‐cost flexible sensors and other devices, with a minimal step, time, and facilities. The operation of such devices is simple and can be further empowered by smartphones for data analysis and transmission.

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“…The polarity on the electrohydrodynamic (EHD) spraying of water (deionized and tap water) in air and a pure CO 2 environment was discussed (Kim et al, 2014). The electro-spraying modes could be obtained with double capillaries or multi-nozzle, and the effects of tubes on spraying modes were also discussed (Deng et al, 2006;Wang et al, 2017;Zhang et al, 2018;Karbalaei and Cho, 2020). The effect of water conductivity on electrospraying of water was studied in combination with positive DC corona discharge generated in air (Pongrác et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of electro-spraying modes of deionized water in atmospheric environment

Wang

Jiang

et al. 2020

Exp. Comput. Multiph. Flow

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The liquid emitting from capillary subjected to a high electric voltage could be dispersed in different ways depending on applied potential and flow rate. The electro-spraying of deionized water was experimentally studied adopting the high-speed camera under different operating parameters. The time resolved images and evolution of drop or/and jet initiation, pulsation, deformation, and separation from capillary tip or meniscus were captured and analyzed. The known electro-spraying modes were identified according to the geometrical forms of meniscus, jet, or/and drop. A spherical droplet with diameter larger than the outer diameter of capillary could be generated in dripping mode at low potential, while a spherical droplet with diameter smaller than outer diameter of capillary could be observed in micro-dripping mode with relative high potential. Spindle-like droplet could be found in spindle mode and usually further disperse into a few of drops with different size for larger flow rate. In the range of applied potential and flow rate, oscillating jet and simple jet could be found, where a long jet could be elongated by electric stresses and further break up into finer drops with highly charged drops. In addition, the operating parameters and drop sizes for different modes are also discussed. Meanwhile, the spraying modes with double capillaries were also observed and discussed.

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Passive mixing rate of trapped squeezed nanodroplets—A time scale analysis

Cited by 4 publications

References 19 publications

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

Laserjet Printed Micro/Nano Sensors and Microfluidic Systems: A Simple and Facile Digital Platform for Inexpensive, Flexible, and Low‐Volume Devices

Experimental study of electro-spraying modes of deionized water in atmospheric environment

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