In this paper, growth and collapse of a vapour bubble generated due to a local energy input inside a rigid cylinder and in the absence of buoyancy forces is investigated using Boundary Integral Equation Method and Finite Difference Method .The fluid is treated as potential flow and Boundary Integral Equation Method is used to solve Laplace’s equation for velocity potential. Different ratios of ...

China’s decade-long housing boom looks nothing short of a gigantic bubble familiar to many countries: In big cities the price-to-income ratio reached 30 to 1 and the vacancy rate stood at 30% or above. This paper provides a theoretical framework to shed light on the causes and consequences of the great housing boom in China. We argue that the boom could be a rational bubble rooted in China’s un...

A realistic non-spherical model for bubble formation in a co-flowing liquid is presented. In the model, an interfacial element approach is applied to describe the dynamics of bubble formation. The effect of flowing liquid velocity is modeled by a combination of the bubble axis translation and liquid pressure analysis of each interfacial element. The bubble shapes during formation are predicted ...

A linear bubble model of grain growth is introduced to study the conditions under which an isolated grain can grow to a size much larger than the surrounding matrix average (abnormal growth). We first consider the case of bubbles of two different types such that the permeability of links joining unlike bubbles is larger than that of like bubbles (a simple model of grain boundary anisotropy). St...

We analyze the properties of naturally formed nanobubbles in Lennard-Jones molecular dynamics simulations of liquid-to-vapor nucleation in the boiling and the cavitation regimes. The large computational volumes provide a realistic environment at unchanging average temperature and liquid pressure, which allows us to accurately measure properties of bubbles from their inception as stable, critica...

Understanding bubble dynamics is critical to the design and optimization of two-phase microchannel heat sinks. This paper presents a hybrid experimental and computational methodology that reconstructs the three-dimensional bubble geometry, as well as provides other critical information associated with nucleating bubbles in microchannels. Rectangular cross-section silicon microchannels with hydr...

The bubble growth problems in both boiling and electrolysis are nondimensionalized in such a way as to make them identical. Nonuniformity of the initial temperature and the possibility of a measure of subcooling in the ambient liquid are considered. The nondimensiona/ization makes it possible to compare gas-bubble growth theory with vaporbubble growth data. Such a comparison is made for the dat...

The process of cavitation involves generation, growth, coalescence, and collapse small bubbles is tremendously influenced by bubble–bubble interactions. To understand these interactions, a new model based on the transport equation proposed herein. modified Rayleigh–Plesset analyzed to determine bubble growth rate assuming equal-sized spherical clouds. source term in then derived according with ...

Histotripsy treatments use high-amplitude shock waves to fractionate tissue. Such treatments have been demonstrated using both cavitation bubbles excited with microsecond-long pulses and boiling bubbles excited for milliseconds. A common feature of both approaches is the need for bubble growth, where at 1 MHz cavitation bubbles reach maximum radii on the order of 100 microns and boiling bubbles...