关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">交错, 多级, 内环流反应器, 气泡分布, 气含率, 气泡直径, 流体动力学, 群体平衡模型

Abstract: Due to its unique circulation characteristics and high mass transfer efficiency, the loop reactor has shown great application potential in the fields of bioengineering, environmental engineering, and chemical engineering. The research on it focuses on macroscopic fluid dynamic behavior, and the study of bubble diameter distribution has proven significance for the design optimization and scale-up of reactors. This paper utilizes computational fluid dynamics (CFD) and population balance model (PBM) to deeply investigate the bubble diameter distribution inside a staged multistage internal airlift loop reactor. The research found that there is a significant difference in gas holdup between the rising and falling zones; the gas holdup in each stage of the rising zone shows different changing trends along the axis; for the falling zone, the gas holdup increases along the axial height. Large bubbles (with a diameter of 11.56 - 14.98 mm) in the reactor are mainly concentrated in the rising zones of the second and third stages, while smaller bubbles with a diameter of 0.67 - 1.13 mm mainly exist at the bottom of the falling zones of the first and third stages.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">staggered, multistage, internal airlift loop reactor, bubble distribution, gas holdup, bubble diameter, computational fluid dynamics, population balance model