降旋流液膜的速度分布及衰减特性

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-08-01 DOI:10.1016/j.ijheatmasstransfer.2025.127624

Jie Zeng , Yifei Wang , Qian Liu , Guangsuo Yu , Fuchen Wang , Peipei Li , Fuliang Liu

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引用次数: 0

摘要

通过分析液膜的速度分布、流型演变和壁面摩擦系数，探讨了下降旋流中的衰减机理。实验采用超声多普勒测速仪和高速摄像机进行，并在0.58 ~ 1.21 m·s−1的表面液体速度范围内进行数值模拟。结果表明：旋流的速度分布与垂直流的速度分布有明显不同，旋流的合成速度以周向速度为主，离心力促进了旋流条纹的交替。旋流液膜分为近壁区、涡区和近气液界面区。近壁面区和近气液界面区的共同作用诱导了涡区的形成。垂直流的壁面摩擦系数是旋流壁面摩擦系数的1.4 ~ 2.2倍。基于流动距离建立了垂直和旋流壁面摩擦系数的预测相关性，相对误差在±10%以内。此外，还建立了垂直流动和旋流壁面摩擦系数之间的定量关系。

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Velocity distribution and decay characteristics of the liquid film in falling swirling flow

The decay mechanism in falling swirling flow was investigated by analyzing the liquid film's velocity distribution, flow pattern evolution, and wall friction coefficient. Experiments were conducted using ultrasonic Doppler velocimetry, a high-speed camera, and numerical simulations at superficial liquid velocities ranging from 0.58 to 1.21 m·s⁻¹. Results show that the velocity distribution of swirling flow differs markedly from that of vertical flow, with circumferential velocity dominating its resultant velocity, and centrifugal force promotes alternating swirling streaks. The swirl liquid film is divided into near-wall, vortex, and near-gas-liquid interface regions. The combined effect of the near-wall and near-gas-liquid interface regions induces the formation of the vortex region. The wall friction coefficient of vertical flow is 1.4 - 2.2 times greater than that of swirling flow. The predicted correlations for wall friction coefficient in vertical and swirling flows were established based on the flow distance, achieving relative errors within ± 10 %. Furthermore, a quantitative relationship was established between the wall friction coefficients of vertical and swirling flows.

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer