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Behavior of bubble formation in high pressure suspended bubble column

高压悬浮气泡塔中气泡形成行为

基本信息

批准号：
02650698
负责人：
TSUGE Hideki
金额：
$ 1.41万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650698/
关键词：
Bubble Column Suspended Bubble Column High Pressure High Pressure Bubble Column Bubble Formation Bubble Formation Model Particle Holdup 懸濁気泡膝

项目摘要

Many works have been done about the bubble formation at an orifice under atmospheric pressure, while a few works have been done under high system pressure.In this work, the volumes of bubbles formed at an orifice in high pressure bubble column or suspended bubble column were measured experimentally and the effects of various factors on bubble formation, such as the system pressure, gas flow rate, orifice diameter, gas chamber volume and particle holdup were investigated. By the theoretical consideration, the non-spherical bubble formation model was proposed and the calculated results were compared with the experimental ones. The following results were obtained :1. The bubble volumes, increase with increases in gas flow rate and orifice diameter, and with decreases in system pressure and particle holdup. The calculated results by the non-spherical bubble formation model show the similar tendency with the experimental results.2. In high gas flow rate or high pressure regions, the effect of gas chamber volume on the bubble volume is negligible. This result is also supported by the bubble formation model calculation.For the design of bubble formation apparatus in high pressure bubble column or suspended bubble column, it is recommended the bubble formation condition to take close to the constant flow condition, which is written by the dimensionless capacitance number N_C(=4V_C rho _Lg/ pi D_O ^2P_s) < 1, owing to increase effective interfacial area.

本文通过实验测定了高压鼓泡塔和悬浮鼓泡塔中孔板处气泡的体积，研究了系统压力、气体流量、孔板直径、压力、压力和压力等因素对气泡形成的影响，并对气泡形成的机理进行了探讨。研究了气室体积和颗粒滞留量。通过理论分析，提出了非球形气泡的形成模型，并将计算结果与实验结果进行了比较。获得了以下结果：1.气泡体积随气体流量和孔径的增大而增大，随系统压力和颗粒含率的减小而减小。非球形气泡生成模型的计算结果与实验结果具有相似的趋势.在高气体流速或高压区域，气室体积对气泡体积的影响可以忽略不计。对于高压鼓泡塔或悬浮鼓泡塔中的鼓泡生成装置的设计，建议采用接近恒流条件的鼓泡生成条件，即无因次容数N_C（=4V_C rho _Lg/ pi D_O ^2P_s）< 1，以增加有效界面面积。