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CO_2焊熔池图像的Bubble小波零交叉边缘检测

在用CCD捕获的CO2 焊熔池图像中存在大量的弧光噪声和飞溅形成的点噪声 ,要准确地检测熔池图像的边缘较为困难。首先采用中值滤波和乘法运算对CO2 焊图像进行降噪处  (本文共5页) 阅读全文>>

《Transactions of Tianjin University》2004年01期
Transactions of Tianjin University

Effect of Ultrafine Particles on Flow Field and Transport Properties near the Interface Around a Moving Bubble

Laser Doppler Anemometer has been used to measure the flow field characteristics near the interface around a moving bubble in the presence of ultrafine particles. In order to model a moving bubble, the bubble was fixed into the counter flow liquid by a metal mesh. Experimental materials are air and water, and the particles are complex oxidate powder. Experiments were carried out under the operating conditions: the...  (本文共4页) 阅读全文>>

《Chinese Physics B》2020年01期
Chinese Physics B

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field

In order to learn more about the physical phenomena occurring in cloud cavitation, the nonlinear dynamics of a spherical cluster of cavitation bubbles and cavitation bubbles in cluster in an acoustic field excited by a square pressure wave are numerically investigated by considering viscosity, surface tension, and the weak compressibility of the liquid.The theoretical prediction of the yield of oxidants produced in...  (本文共9页) 阅读全文>>

《Chinese Journal of Chemical Engineering》2019年11期
Chinese Journal of Chemical Engineering

Scaling of the bubble/slug length of Taylor flow in a meandering microchannel

In order to reduce or avoid the fluctuations from interface breakup, a meandering microchannel with curved multi-bends(44 turns) is fabricated, and investigations of scaling bubble/slug length in Taylor flow in a rectangular meandering microchannel are systematically conducted. Based on considerable experimental data,quantitative analyses for the influences of two important characteristic times, liquid phase physical...  (本文共11页) 阅读全文>>

《Chinese Journal of Chemical Engineering》2019年11期
Chinese Journal of Chemical Engineering

Modeling bubble column reactor with the volume of fluid approach:Comparison of surface tension models

This work aims at comparing surface tension models in VOF(Volume of Fluid) modeling and investigating the effects of gas distributor and gas velocity. Hydrodynamics of a continuous chain of bubbles inside a bubble column reactor was simulated. The grid inde...  (本文共7页) 阅读全文>>

《Chinese Journal of Chemical Engineering》2020年01期
Chinese Journal of Chemical Engineering

Interaction of two in-line bubbles of equal size rising in viscous liquid

The interaction of bubbles is the key to understand gas–liquid bubbling flow. Two-dimensional axis-symmetry computational fluid dynamics simulations on the interactive bubbles were performed with VOF method,which was validated by experimental work. It is testified that several different bubble interactive behaviors could be acquired under different conditions. Firstly, for large bubbles(d: 4, 6, 8, 10 mm), the t...  (本文共9页) 阅读全文>>