【摘 要】
：
Fine bubbles have been widely applied in many fields such as industry,medical engineering and agricultures.Therefore,many attentions have been paid to the study
【机 构】
：
National Institute of Technology, Kitakyushu College Kitakyushu, Fukuoka 802-0985, Japan
论文部分内容阅读
Fine bubbles have been widely applied in many fields such as industry,medical engineering and agricultures.Therefore,many attentions have been paid to the study of fine bubble generations in order to increase the yield while decrease the cost.However,the generation process of fime bubbles is a quite complicated process in which multiple hydrodynamic forces are interacted in the gas-liquid two-phase flow.Many studies focus on the techniques of the converging-diverging nozzle (venturi tube) generator,which is famous for its simple and cheap features,and generates fine bubbles by using the miniaturization phenomenon of bubbles occurring in the venturi tube.However,the impact conditions on the amount and size of bubbles such as nozzle geometry and bleed air haven't been investigated clearly.In this work,we implement many experiments on the venturi tube fine bubble generators with different geometries and generating conditions,and evaluate different factors impacting the production components such as the volume and the bubble size.The experimental results show that the supersonic flow filed in the venturi tube promotes the miniaturization of the bubbles,and the convergent angle of the nozzle and air bleed have a great impact on the size and volume of bubbles.
其他文献
In order to avoid collision with the end wall of the casing when the guide vane rotates around its own rotating axis in a centrifugal compressor,a circular gap
In this study,mixed convection heat transfer and fluid flow is numerically investigated in an open system enclosure containing a heated obstacle.Effects of the
In this paper,the visualization of the thermo-hydrodynamic behavior in flat-plate pulsating heat pipe(FP-PHP)with HFE-347 is experimentally investigated.The FP-PHP is vertically placed with filling rate of 20%to 70%and heating power of 20 W to 140 W.A hig
The tip leakage flow in different axial gaps is numerically investigated based on the Reynolds-Averaged Navier-Stokes equations and k-ω SST turbulent model usi
In modern high-load high-pressure turbine,the secondary flow in the blade channel is very strong and occupies a large spanwise region.Although high-quality experimental data at the stage interfaces have been obtained in previous research,the influence of
The non-linear temperature glide in the supercritical CO2 cooling process makes the heat transfer pinch point of heat exchanger show multiplicity,like size,loca
The stationary lumped-cell model was developed and used to simulate the thermal characteristics of domestic biomass boiler with helically coiled tube heat excha
In order to determine the sensitivity of influencing factors on NOx emission in gas-fired heating and hot water eombi-boilers,the orthogonal method was adopted
Cooling tower is crucial equipment in the cool-end system of power plant and the natural draft counter-flow wet cooling tower (NDWCT) gets wide application.The
Molten salt and supercritical carbon dioxide (S-CO2) are important high temperature heat transfer media,but molten salt/S-CO2 heat exchanger has been seldom rep