单气泡注入对倾斜管内液相自然对流传热的影响  

Influence of Single Bubble Injection on Natural Convective Heat Transfer of Liquid Phase in Inclined Pipe

作　　者：任锐 Ren Rui(Shanxi Installation Group Co.,Ltd.,Taiyuan 030032,China)

机构地区：[1]山西省安装集团股份有限公司,山西太原030032

出　　处：《化工设计》2025年第2期45-50,2,共7页Chemical Engineering Design

摘　　要：根据地形的需要,工业管道有时会倾斜安装,因此,探究气泡注入对倾斜管内液相自然对流传热的影响具有重要的工业价值。本文利用数值模拟方法,研究了气泡注入对倾斜管道内液相层流自然对流传热的影响及气泡直径和气泡形状(用Eo表征)对热壁和液相间传热的影响。结果表明:气泡注入能有效提高壁面与液相间的传热能力;当管道倾斜时,气泡将沿着壁面滑动,能促使传热强化水平提高;气泡直径和Eo数的增大能提高传热强化效果和扩大传热强化区域。对比发现:滑动气泡对液相间的传热强化能力高于气泡自由上升的状态;气泡沿壁面的滑动使壁面局部液相发生对流效应,温度边界层被破坏,导致传热效果被提高。According to the needs of the terrain,industrial pipelines are sometimes installed inclined.Therefore,exploring the influence of bubble injection on the natural convective heat transfer of the liquid phase in an inclined pipe has important industrial value.In this paper,the numerical simulation method is used to study the influence of bubble injection on the laminar natural convective heat transfer of the liquid phase in an inclined pipeline,as well as the influence of the bubble diameter and the bubble shape(characterized by Eo)on the heat transfer between the hot wall and the liquid phase.The results show that bubble injection can effectively improve the heat transfer capacity between the wall surface and the liquid phase;when the pipeline is inclined,the bubbles will slide along the wall surface,which can promote the improvement of the heat transfer enhancement level;the increase of the bubble diameter and the Eo number can improve the heat transfer enhancement effect and expand the heat transfer enhancement area.The comparison reveals that the heat transfer enhancement ability of the sliding bubbles to the liquid phase is higher than that in the state of free bubble rising;the sliding of the bubbles along the wall surface causes a convective effect in the local liquid phase of the wall surface,and the temperature boundary layer is broken,resulting in the improvement of the heat transfer effect.

关 键 词：气泡 自然对流 传热强化 倾斜管道 

分 类 号：TQ016[化学工程]