Experimental Study on the Behavior of a Bubble in the Vicinity of an Air Bubble Attached to a Fixed Structure

2020 ◽  
Author(s):  
Jia-xia Wang ◽  
Kun Liu
Keyword(s):  
Deformation Property ◽  
Low Voltage ◽  
Volume Ratio ◽  
Complex Phenomenon ◽  
Air Bubble ◽  
Large Numbers ◽  
Bubble Interaction ◽  
Fixed Structure ◽  
Bubble Splitting ◽  
Distance Parameter

Abstract The interaction between a spark-generated bubble and a non-oscillating air bubble attached to a horizontal rigid plate is investigated using a low-voltage spark-discharge setup. Large numbers of fascinating and complicated interactions are given rise during two bubble coupling pulsation due to the deformation property endowed to the plate through an air bubble attached. It is found that, under the combined influence of the cavitation and the structure, some complex phenomenon likes the bubble coalescence, air bubble skirt phenomenon, bubble splitting are given rise during the two bubble interaction procedure. The coupling phenomenon between the spark generated bubble, air bubble and the structure are discussed in detailed The mainly attention are paid to the coupled response of an attached quiescent bubble under oscillating bubble, the effect of the distance parameter and volume ratio parameter on the air bubble shapes are analyzed in detail, and the mechanism behind these phenomenon are investigated. Our study can be a useful scheme in the protection of a naval structure from threats induced by an explosion bubble impact loading.

Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Numa Bertola ◽  
Hang Wang ◽  
Hubert Chanson
Keyword(s):  
High Speed ◽  
Point Explosion ◽  
Air Bubble ◽  
Bubble Breakup ◽  
Jet Impact ◽  
Bubble Entrainment ◽  
Bubble Interaction ◽  
Onset Velocity ◽  
Air Cavities ◽  
Interaction Behaviors

The entrainment, breakup, and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities. Ultra-high-speed movies were analyzed both qualitatively and quantitatively. The onset velocity of bubble entrainment was between 0.9 and 1.1 m/s. Most bubbles were entrained as detached bubbles from elongated air cavities at the impingement point. Explosion, stretching, and dejection mechanisms were observed for individual bubble breakup, and the bubble interaction behaviors encompassed bubble rebound, “kiss-and-go,” coalescence and breakup induced by approaching bubble(s). The effects of jet impact velocity on the bubble behaviors were investigated for impact velocities from 1.0 to 1.36 m/s, in the presence of a shear flow environment.

scholarly journals Electronic Nose Based on Nanomaterials: Issues, Challenges, and Prospects

2013 ◽  
Vol 2013 ◽  
pp. 1-21 ◽  
Author(s):  
Niranjan S. Ramgir
Keyword(s):  
Electronic Nose ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Fast Response ◽  
Surface Reactivity ◽  
Commercial Application ◽  
Large Numbers ◽  
Device Applications ◽  
Further Development

The ability to precisely control the morphology and dimension coupled with the tunable surface reactivity has led to the widespread investigation of nanomaterials for various device applications. The associated high surface area to volume ratio implies that large numbers of atom are residing on the surface and are available for interaction. Accordingly, nanomaterials have demonstrated the potential to realize sensors with ultrahigh sensitivities and fast response kinetics. The smaller size further provides the possibility of miniaturization and integration of large number of devices. All these properties makes them an attractive candidate for the fabrication of electronic nose or e-nose. E-nose is an intelligent chemical-array sensor system that mimics the mammalian olfactory system. The present paper critically reviews the recent development in the field of nanomaterials based e-nose devices. In particular, this paper is focused on the description of nanomaterials for e-nose application, specifically on the promising approaches that are going to contribute towards the further development of this field. Various issues related to successful utilization of different nanomaterials for commercial application are discussed, taking help from the literature. The review concludes by briefing the important steps taken towards the commercialization and highlighting the loopholes that are still to be addressed.

scholarly journals Control of BLDC Motor Air Cooler for Low Voltage DC House

2019 ◽  
Vol 8 (11) ◽  
pp. 455-458
Keyword(s):  
Distribution System ◽  
Low Voltage ◽  
Cooling System ◽  
Volume Ratio ◽  
Air Cooling ◽  
Bldc Motor ◽  
Cooling Systems ◽  
Brushless Dc ◽  
Air Cooling System ◽  
Air Cooler

Recent power sector targets on cleaner and sustainable generation and distribution system. This can be done by improving DC based applications for low voltage DC residential homes. During summer air cooling systems are very much useful in reducing the room temperature. Brushless-DC (BLDC) motors are best suited these days as electric motors of fans and air cooling systems with very low power utilization and many other reasons like lesser maintenance, compact and huge gain of torque to volume ratio etc., the control of BLDC motor classified mainly of two types sensor scheme and sensor-less schemes. This paper presents simulation and analysis of two control schemes for BLDC motor drive for air cooling system. The BLDC drive system was developed in MATLAB for both sensor and sensor-less schemes and simulated for different loading conditions.

PARTICLE–FREE AIR BUBBLE INTERACTION IN LIQUID

2020 ◽  
Vol 56 (6) ◽  
pp. 990-999 ◽  
Author(s):  
S. A. Kondrat’ev ◽  
N. P. Moshkin
Keyword(s):  
Air Bubble ◽  
Free Air ◽  
Bubble Interaction

scholarly journals Air bubble interaction with a submerged, axisymmetric water jet.

1991 ◽  
Vol 90 (4) ◽  
pp. 2318-2318
Author(s):  
Sean M. Cordry ◽  
Ronald A. Roy ◽  
Lawrence A. Crum
Keyword(s):  
Water Jet ◽  
Air Bubble ◽  
Bubble Interaction

scholarly journals Biatrial volume ratio predicts low voltage areas in atrial fibrillation

2021 ◽  
Author(s):  
Timm Seewöster ◽  
Borislav Dinov ◽  
Sotirios Nedios ◽  
Gerhard Hindricks ◽  
Philipp Sommer ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Low Voltage ◽  
Volume Ratio

High-Strain Ionomeric-Ionic Liquid Composites via Electrode Tailoring

Aerospace ◽  
2004 ◽  
Author(s):  
Barbar J. Akle ◽  
Mathew D. Bennett ◽  
Donald J. Leo
Keyword(s):  
Ionic Liquid ◽  
High Strain ◽  
Low Voltage ◽  
Volume Ratio ◽  
High Sensitivity ◽  
Low Voltage Operation ◽  
Ionomer Membranes ◽  
Electrode Interface ◽  
Electromechanical Transducers ◽  
Electrode Composition

Ionomeric polymers are a class of electromechanical transducer consisting of an ionomeric substrate with metal-plated electrodes. Application of a low voltage (< 5 V) across the thickness of the membrane produces controllable strain. The advantage of ionomeric polymers compared to other types of electromechanical transducers (e.g. piezoelectric polymers) is low-voltage operation, high strain capability, and high sensitivity in charge mode. Two of the primary limitations of ionomeric polymers for electromechanical transducers are unstable operation in air and solvent breakdown at low voltage. This work focuses on overcoming these limitations through the development of an ionic liquid-ionomeric composite with a tailored electrode composition that maximizes strain output. It is becoming clear that charge accumulation at the polymer-electrode interface is the key to producing high strain in ionomeric polymer transducers. In this work we combine a previously developed process for incorporating ionic liquids into ionomer membranes with a new method for tailoring the electrode composition. The electrode composition is studied as a function of the surface-to-volume ratio and conductivity of the metal particulates. Results demonstrate that the surface-to-volume ratio of the metal particulate is critical to increasing the capacitance of the transducer. Increased conductivity of the metal particulates produces improved response at higher frequencies (> 10 Hz) but this effect is small compared to the increase in strain produced by maximizing the capacitance. Increasing capacitance produces a transducer that is able to achieve > 2% strain at voltage levels of +/- 3 V.

scholarly journals Comparison of the Location and Rating of Energy Storage for Renewables Integration in Residential Low Voltage Networks with Overvoltage Constraints

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2041 ◽  
Author(s):  
Andrew F. Crossland ◽  
Darren Jones ◽  
Neal S. Wade ◽  
Sara L. Walker
Keyword(s):  
Energy Storage ◽  
Low Voltage ◽  
Distribution Networks ◽  
Network Operator ◽  
Mitigation Measure ◽  
Work Location ◽  
Distributed Generators ◽  
Large Numbers ◽  
Pv Generation ◽  
The Impact

Expansion of photovoltaic (PV) generation is increasing the challenge for network operators to keep voltages within operational limits. Voltage rise occurs in low voltage (LV) networks when distributed generators export, particularly at times of low demand. However, there is little work quantifying the scale of voltage issues and subsequently potential solutions across large numbers of real networks. In this paper, a method is presented to analyse a large quantity of geographically and topographically varying distribution networks. The impact of PV on voltages in 9163 real LV distribution networks is then quantified. One potential mitigation measure is increased network demand to reduce voltages. In this work, location algorithms are used to identify where increased demand, through energy storage, has the greatest effect on overvoltage. The study explores the impact on overvoltage of two modes of storage installation reflecting differing routes to adoption: purchase of storage by homeowners and purchase by network operators. These scenarios are compared with traditional re-conductoring in the 9163 networks. It is shown that to avoid violation of absolute voltage limits, storage should be installed at strategically important locations. Storage in homes reduces overvoltage, offering clear benefits to the network operator, but very wide deployment is required to completely remove the need for reinforcement.

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