As the core fundamental components in the field of fluid transmission and control, viscous oil fluid components determine the technological level of fluid machinery and high-end equipment. However, bubbles as effective cavitation nuclei widely exist in the interior of viscous oil fluid components, directly affecting their performance and technological development. In order to reveal the bubble motion characteristics in viscous oil and establish a high-precision prediction method, this paper focuses on No. 110 technical white oil and develops a visualized observation system for studying the motion characteristics and morphological features of bubbles in viscous oil. The bubble motion trajectory, rising rate, and force state are analyzed, and a prediction model for the drag coefficient is proposed and corrected. The research results indicate that during the rising process, the bubble morphologies in viscous oil show an elliptical shape. The oil temperature has a significant influence on the bubble motion characteristics, with the occurrence of oscillations during the rise process after reaching 80 °C. Additionally, a new prediction model for the drag coefficient of bubble is fitted, where the relative error of bubble motion rate can be controlled within 5.5% for 0.3 < Re < 50. This research provides significant theoretical significance and engineering application value.

中文翻译：

---

低雷诺数粘稠油中气泡运动及阻力系数修正研究

粘稠油流体元件作为流体传动与控制领域的核心基础零部件，决定着流体机械和高端装备的技术水平。然而，气泡作为有效的空化核，广泛存在于粘稠油流体元件内部，直接影响其性能和技术发展。为了揭示粘稠油中气泡运动特征并建立高精度预测方法，本文以110号工业白油为研究对象，研制了研究粘稠油中气泡运动特征和形态特征的可视化观测系统。分析了气泡运动轨迹、上升速率和受力状态，提出并修正了阻力系数的预测模型。研究结果表明，在上升过程中，粘稠油中的气泡形态呈现椭圆形。油温对气泡运动特性影响较大，达到80℃后上升过程中会出现振荡。此外，还建立了新的气泡阻力系数预测模型，在0.3＜0.3的条件下，气泡运动速率的相对误差可控制在5.5%以内。重新< 50. 这项研究具有重要的理论意义和工程应用价值。