冷却液
材料科学
空化
柴油
表面张力
沸腾
聚结(物理)
气泡
复合材料
核工程
机械
废物管理
热力学
机械工程
工程类
物理
天体生物学
作者
Marcio Abreu,Stefan Jönsson,Jessica Elfsberg
出处
期刊:Wear
[Elsevier]
日期:2024-01-04
卷期号:542-543: 205238-205238
被引量:1
标识
DOI:10.1016/j.wear.2024.205238
摘要
This study investigates the cavitation erosion performance of heavy-duty engine coolants before and after operation in trucks using an ultrasonic test rig based on ASTM G32. Fresh coolants with 35% and 50% v/v glycol were compared with used coolants. One coolant was obtained from a gasoline-fueled vehicle with a mileage of 27 000 km, and two from diesel-fueled vehicles with mileages of 16 000 and 180 000 km, respectively. Surface tension and boiling point at atmospheric pressure were measured, a chemical analysis was carried out, and suspended particles were quantified by dynamic image analysis. The results showed that the used coolants caused a lower mass loss in ultrasonic cavitation testing than the fresh ones, and that they had higher boiling points, lower pH and a higher number of suspended particles, especially of those smaller than 30μm. Surface tension was higher for the used coolants from Diesel engines. The lower mass loss caused by all three used coolants can be attributed mainly to their high boiling point and high particle count. The presence of particles is believed to promote the heterogeneous nucleation of smaller, more stable bubbles, which may protect the exposed surface by shockwave absorption and microjet deflection. Some dissolved ions in the used coolants may help reduce their aggressivity by inhibiting bubble coalescence, reducing bubble collapse energy, despite increasing surface tension. Surface tension has complex interactions with the solutes, particles and bubble formation and cannot, in isolation, explain the differences in performance of the coolants.
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