Bubble growth characterization during fast boiling in an enclosed geometry

Escobar-Vargas, Sergio; Fabris, Drazen; González, Jorge E.; Sharma, Ratnesh; Bash, Cullen; Ruiz, Orlando

doi:10.1016/j.ijheatmasstransfer.2009.05.001

Cited by 6 publications

(5 citation statements)

References 38 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the second growth, heterogeneous nucleation occurs and affects the heat transfer and the pressure field inside the nozzle chamber, which the instability increases during droplet ejection. Similar behavior of bubble growth-shrink-growth has been reported in other research studies [15,16].…”

Section: Discussionsupporting

confidence: 89%

Characterization of thermal inkjet droplets jitter

Wang¹,

Zhu²,

Li³

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Due to the randomness in the nucleation process of vapor bubbles and the instability of ink drop breakup in the thermal inkjet drop ejector, the drop velocity varies slightly from drop to drop, such a variation is called the jitter of the droplets. Droplet jitter causes variations in drop volume, satellite drop formation, and drop placement error on the receiving substrate, which limit the high accuracy printing application for thermal inkjet. Traditionally, a multipleexposure method is used to photograph the droplets in flight, which is unable to measure jitters of every drop due to the low sampling rate. In this study, a laser-based high-speed flying drop measurement system is used to study the jitter. We tentatively propose a simple model to explain the cause of droplet jitter, which is related to the latency phenomenon, the randomness in droplet formation and the difference in droplets velocity. The jitter is recorded under different driving conditions and the distribution of jitter is analyzed. As a conclusion, the conditions for operation to achieve lower jitter are determined. Under certain driving conditions, the jitter can be reduced by 90%.

show abstract

Section: Discussionsupporting

confidence: 89%

Characterization of thermal inkjet droplets jitter

Wang¹,

Zhu²,

Li³

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Because the dynamic interaction between the vapor phase and the solid heater is so complicated, no theoretical model has been established to carefully describe the whole process. The pressure inside an explosive bubble can be approximated by the Rayleigh-Plesset equation if we neglect the wall effect and make an analogy with half of a free bubble using the mirror image from the solid heater [15,24,25]:…”

Section: Resultsmentioning

confidence: 99%

“…The useful mechanical work of an explosive bubble is defined as the work performed by the internal high pressure to overcome the ambient pressure and the interfacial energy during bubble expansion [24,25]:…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Energy cascading by triple-bubble interactions via time-delayed control

Lin¹,

Chang²,

Yang³

et al. 2011

J. Micromech. Microeng.

View full text Add to dashboard Cite

The triple-bubble interaction controlled by a precise time-delayed technique was investigated in detail with respect to different ignition times, heater spaces and sequential firing modes to promote efficient energy cascading and concentration. The target bubble, which was generated under a specific delay time with two auxiliary bubbles, can have a volume that is two or almost three times larger than that of a single bubble. This result overcomes the limitation of energy usage on an explosive microbubble under a constant heat flux. As the heater space decreases, stronger bubble-bubble interactions were obtained due to the hydrodynamic effect and the intensive pressure wave emission, resulting in highly enhancing and depressing bubble dynamics. Other interesting phenomena, such as bubble shifting, mushroom-shape bubble, rod-shape bubble and bubble extension among heaters, were also recorded by a high-speed phase-averaged stroboscopic technique, displaying special non-spherical bubble dynamics. Artificial manipulation of bubble behavior was further conducted in a two-level sequential firing process. Using various volumetric combinations, the adjustable multi-level fluid transportation can be realized by a digital time-delayed control. The above-mentioned information can be applied to not only the design and operation of inkjet printheads but also cavitation research and fluid pumping in microdevices.

show abstract

“…Homogeneous nucleation is driven statistically without the presence of impurities inside the fluid, 20 preferentially at high-volatile liquids 21 and high level of superheating. 22 Based on a turbulent two-phase flow for gasoline DI sprays, the technical relevance of a homogeneous fluid can be regarded as inferior. 23 The heterogeneous nucleation occurs at already existing phase boundaries inside the fluid.…”

Section: The Nucleation Of Vapor Bubbles Can Occur Homo-mentioning

confidence: 99%

Flashboiling-induced targeting changes in gasoline direct injection sprays

Krämer

Kull

Wensing

2015

International Journal of Engine Research

View full text Add to dashboard Cite

By definition, flashboiling is referred to as superheated injections. The sudden occurrence of boiling inside the fuel can change the spray structure dramatically. Up to 99% of all injection processes during the New European Driving Cycle and 95% during 'Real Driving Emissions' tests are, with respect to mid-range cars, in a state of thermodynamic nonequilibrium below the specific vapor pressure of gasoline. Considering this fact, the scientific question is not the appearance of flashboiling during the operation of stoichiometric homogeneous charge direct injection gasoline engines but the intensity of occurring spray processes and their influence on nominal spray designs. As a consequence of induced targeting changes, the positive influence of flashboiling on the droplet size distribution and the penetration depth can be counteracted. As main driving factors for targeting changes, jet-to-jet interactions can be identified. By applying appropriate nozzle design features, the potential of flashboiling can be exploited and the targeting changes of the nominal spray designs, considered negatively, are avoided mostly. This work focuses on flashboiling-induced targeting changes, the socalled phenomenon of ''spray collapse'': its root cause, development and avoidance.

show abstract

Bubble growth characterization during fast boiling in an enclosed geometry

Cited by 6 publications

References 38 publications

Characterization of thermal inkjet droplets jitter

Characterization of thermal inkjet droplets jitter

Energy cascading by triple-bubble interactions via time-delayed control

Flashboiling-induced targeting changes in gasoline direct injection sprays

Contact Info

Product

Resources

About