An earlier developed, first principles hydrodynamic model of gas-fluidized beds has been employed to study theoretically bubble formation at a single orifice in a two-dimensional bed. For several orifice discharge rates, theoretically predicted bubble sizes, formation times and shapes have been compared with experimental data obtained from triggered photographs. Besides, the present experimenta...

This paper provides an empirical examination of the investments by venture capital firms for the period before, during and after the stock market bubble of 1999 and 2000. Comparisons are made between pre-bubble, bubble and post-bubble investment patterns by state for location, stage and industry of investment. Location quotients for investments by state and industry are displayed. States with l...

High-speed video and infrared thermometry were used to obtain timeand space-resolved information on bubble nucleation and heat transfer in pool boiling of water. The bubble departure diameter and frequency, growth and wait times, and nucleation site density were directly measured for a thin, electrically-heated, indium-tin-oxide surface, laid on a sapphire substrate. These data are very valuabl...

Natural cavitation is defined as the phenomenon of the formation of vapor bubbles in a flow due to the pressure falls below the liquid’s vapor pressure. The inception of the cavitation bubble is influenced by many factors, such as impurities, turbulence, liquid thermal properties etc. In this paper, we simulate a 2D cavitation ”bubble” growth under shear flow in the inception stage by Single-Co...

In order to investigate a single vacuum bubble collapse near the free surface and the rigid boundary, the moving particle simulation (MPS) method has been used. Liquid and gas phase were defined by the moving particles and bobble shape was determined by the position of interface particle. The calculation was performed with four parameters; bubble radius, distances from free surface or rigid bou...

Background: Venepuncture is a minimally invasive procedure, which is commonly performed in hospitals; if the pain is inadequately managed, it can cause negative feelings in children. Distraction can reduce pain through affecting the central nervous system and releasing neurotransmitters that inhibit pain. Aim: In this study, we aimed to compare the effects of play-dough and bubble making as dis...

Bubbles generated by breaking waves can drive significant gas exchange between the ocean and atmosphere, but the role of bubble-mediated gas transfer in estuaries is unknown. Here, backscatter data from 41 acoustic Doppler current profiler stations was analyzed to assess subsurface bubble distributions in nine estuaries along the U.S. East and Gulf Coast. Wind speed, wind direction, and current...

We conduct three-dimensional axisymmetric hydrodynamical numerical simulations of bubble evolution in clusters of galaxies. We inflate bubbles using slow, massive jets with a wide opening angle, and follow their evolution as they rise through the intra-cluster medium (ICM). We find that these jet-inflated bubbles are quite stable, and can reach large distances in the cluster while still maintai...

During phase change at the bubble-liquid interface, under subcooled boiling conditions, noncondensable gases dissolved in the liquid will be injected into the bubble along with vapor. Due to heat transfer into subcooled liquid, vapor will condense in the upper regions of the bubble while noncondensables will continue to accumulate. Subsequently, thermocapillary convection caused by nonuniform s...