نتایج جستجو برای: bubble pressure
تعداد نتایج: 422531 فیلتر نتایج به سال:
Hubble-bubble has been the most common device for smoking tobacco in Iran and its neighboring. It has a folkloric name in every region. Hubble-bubble consists of a glass pitcher or pottery at the bottom, a wooden body in the middle, a wooden or plastic tube attached to the body for puffing, and a censer at the top to put tobacco and charcoal. Puffing causes the charcoal to catch fire and the to...
Electron density bubbles--wake structures generated in plasma of density n(e) approximately 10(19) cm(-3) by the light pressure of intense ultrashort laser pulses--are shown to reshape weak copropagating probe pulses into optical "bullets." The bullets are reconstructed using frequency-domain interferometric techniques in order to visualize bubble formation. Bullets are confined in three dimens...
Cleaning and erosion of objects by ultrasound in liquids are caused by the action of acoustic cavitation bubbles. Experiments have been performed with respect to the erosive effect of multibubble structures on painted glass surfaces and on aluminium foils in an ultrasonic standing wave field at 40 kHz. High-speed imaging techniques have been employed to investigate the mechanisms at work, in pa...
Inorganic colloidal particles which are in situ hydrophobized upon adsorption of short-chain amphiphilic molecules can be used as foam stabilizers. In this study, we tailor the microstructure of particle-stabilized wet foams, namely, the foam air content, average bubble size, and bubble size distribution, by changing the composition of the initial colloidal suspension. Wet foams featuring avera...
In cryogenic fluid storage and delivery, the rapid contraction rebound of bubbles are prone to occur during bubble collapse due pressure saltation. With bubbles, temperature in fluctuate greatly, which affects service life machinery. During rebound, there is an accompanied complex heat mass transfer process. According thermal properties fluids, a single-bubble model proposed considering variati...
Occurrence of laminar separation bubbles on solid walls of an elliptic cylinder has been simulated using a recently developed transitional model for boundary layer flows. Computational method is based on the solution of the Reynolds averaged Navier-Stokes (RANS) equations and the eddy-viscosity concept. Transitional model tries to simulate streamwise fluctuations, induced by freestream turbulen...
Abstract The bubble–bubble interaction and bubble–needle are usually caused by liquid flow in the needle or needle’s neighborhood. Moreover, nonlinear changes liquid’s velocity pressure can lead to chaotic bubble departures. In present paper, neighborhood were experimentally numerically investigated. experiment, bubbles generated from a brass into distilled water. A second was placed at distanc...
– We study experimentally the pressure drop needed to push a bubble train in a millimetric channel, as a function of the velocity. For dry liquid foams, the influence of the amount of liquid and of the bubble size is pointed out and we predict theoretically that this influence is closely related to the power law obtained for the force/velocity relation. This model is in fair agreement with our ...
Single bubble sonoluminescence (SBSL) is realized in air-saturated water at ambient pressure and room temperature. The behavior is similar to SBSL in degassed water, but with a higher spatial variability of the bubble position. A detailed view on the dynamics of the bubbles shows agreement between calculated shape stability borders but differs slightly in the equilibrium radii predicted by a ma...
Thermodynamic expressions are derived for the system relative Gibbs free energy, and the relative Gibbs free energy per bubble, for all possible equilibrium bubble states that can form in a soft slightly rigid material, initially supersaturated with a dissolved inert gas (N(2)). While the thermodynamic manipulations are exact, the final expressions are approximate, due to an approximation made ...
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