微藻悬浮液中CO_2气泡生长及脱离特性研究

Characteristics of CO_2 Bubble Growth and Departure in Microalgae Suspension

实验研究了气液界面处的微藻行为以及滞止微藻悬浮液(OD_(680nm)=0.97)中不同气体流量对单个气泡生长和脱离特性的影响。结果表明:微藻在气液界面附近向CO_2浓度较高处运动并富集,在毛细力作用下吸附在气泡表面;微藻悬浮液的密度和表面张力系数均随OD_(680nm)值的增加而减小;随气体流量的增加,微藻悬浮液中气泡的生长逐渐由稳定生长过渡至非稳定生长,在稳定生长区微藻悬浮液中气泡的脱离直径小于纯水中气泡的脱离直径,在非稳定生长区微藻悬浮液中气泡的脱离直径大于纯水中气泡的脱离直径。

Visual experiments were conducted for studying the behavior of microalgae at the gas-liquid interface and the Characteristics of CO2 bubble growth and departure in microalgae suspension （OD680nm = 0.97）. The results showed that the microalgae were moving to the gas-liquid interface, where the CO2 concentration is higher than liquid region, and enrichment at the interface by capillary force. The density and surface tension coefficient of microalgae suspension decreased with the increasing of OD680nm value. With the addition of the flow of gas, the CO2 bubble growth process changed gradually from stable state to unstable state in microalgae suspension. The departure diameter of CO2 bubble in microalgae suspension is smaller than in pure water at the stable growth zone, but at the unstable growth zone, an opposite conclusion can be got.