نتایج جستجو برای: bubble technique

تعداد نتایج: 627359  

This paper investigates the effect of the wind-generated bubble layer on the underwater sound source localization in the Persian Gulf shallow-water environment through computer simulation and the matched field processing technique. An underwater sound source of 2-10 kHz located at depths of 10, 45, and 75 m was considered at a distance of 4 km from a linear vertical receiver array. The estimati...

2013
Tadeu Zubaran Marcus Ritt

In this paper we study the application of Bubble Search, an extension of priority-based greedy heuristics proposed by Lesh and Mitzenmacher (2006), as an improvement procedure for heuristic solutions of the permutation flow shop scheduling problem. We compare the performance of Bubble Search on different time scales and for different parameter settings. In particular, we demonstrate the optimal...

2014
Jose Luis Güell

METHODS: Design: Retrospective interventional case series. Study population: 21 eyes from 21 patients who underwent visco-bubble technique for DALK, which involves the injection of ophthalmic viscosurgical devices (OVDs) into the deep stroma to form a visco-bubble to separate Descemet ́s membrane from the posterior stroma. Surgeries were performed between May 2010 and January 2013. Main outcome ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2005
Thomas Cubaud Mahidhar Tatineni Xiaolin Zhong Chih-Ming Ho

This Brief Report presents experimental and computational results on bubble formation in microfluidic devices. Bubbles are generated at the right-angle intersection of four identical square microchannels. When the pressure gradient generated by the liquid flow dominates the pressure gradient generated by gas flow, the length of the produced confined bubbles follows a law based on the channel si...

2011
Keita Ando Tim Colonius Christopher E. Brennen

The effect of distributed bubble nuclei sizes on shock propagation in a bubbly liquid is numerically investigated. An ensemble-averaged technique is employed to derive the statistically averaged conservation laws for polydisperse bubbly flows. A finite-volume method is developed to solve the continuum bubbly flow equations coupled to a single-bubble-dynamic equation that incorporates the effect...

1997
Guy D. Moore

I discuss the applicability of classical techniques to the study of the dynamics of infrared, bosonic fields at the electroweak phase transition. I present the lattice as a natural means of cutting off hard, nonclassical modes, and discuss the problem of integrating out the excluded modes perturbatively. I then apply the classical lattice technique to study the dynamics of the phase interface (...

2017
Matt Stickland William Dempster Lee Lothian Andrew Oldroyd

An understanding of bubble flows is important in the design of process equipment, particularly in the chemical and power industries. In vapour-liquid processes the mass and heat transfer between the phases is dominated by the liquid-vapour interface and is determined by the number, size and shape of the bubbles. For bubble flows these characteristics are often controlled by the generation mecha...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
behzad shahbazi bahram rezai sayed mohammad javad koleini mohammad noparast

in this research, the effect of bubble surface area flux, sb, and particle size on flotation rate constant, k, of pyrite (fes2) particles was studied using bubble-particle interactions. the bubble-particle collision, attachment and detachment efficiencies were calculated under different flow regimes. the k increased with increase in the collision efficiency and decrease in the detachment effici...

علی‌عسگریان , محمد , کلانتری, سید ظفرالله ,

  Moving single bubble sonoluminescence has been discovered after searches to find the fluids other than water for observing SBSL. The main property of these fluids is their more viscosity rather than water. In this paper, after introducing the forces which act on sonoluminescing bubble, the moving of the bubble have been simulated. For this purpose, the bubble’s equation of motion is coupled w...

2007
C. K. TURANGAN A. R. JAMALUDDIN G. J. BALL T. G. LEIGHTON C. K. Turangan A. R. Jamaluddin

A free-Lagrange numerical method is implemented to simulate the axisymmetric jetting collapse of air bubbles in water. This is performed for both lithotripter shock-induced collapses of initially stable bubbles, and for free-running cases where the bubble initially contains an overpressure. The code is validated using two test problems (shock-induced bubble collapse using a step shock, and shoc...

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