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Thermal Conductivity Mechanism of Oil-Cooled Copper Surfaces Based on the Molecular Dynamics Approach
Yazhen Wang1, Shiting Jiang1, Jianjun Hou1
1College of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 2, 2025
Summary
Optimizing heat dissipation in CT tubes involves managing interfacial thermal resistance and oil thermal conductivity. Increasing oil flow rate and using functionalized carbon nanotubes significantly enhance cooling efficiency.
Area of Science:
- Materials Science
- Thermal Engineering
- Computational Physics
Background:
- Oil cooling systems for CT (computed tomography) tubes face limitations due to interfacial thermal resistance between copper and oil, and the inherent thermal conductivity of the oil.
- Efficient heat dissipation is crucial for the performance and longevity of CT tube systems.
Purpose of the Study:
- To investigate the impact of oil flow rate on interfacial heat transport in oil-cooled CT tubes.
- To evaluate the effect of carbon nanotubes (CNTs) on the thermal conductivity of the cooling oil.
- To provide theoretical guidance for improving liquid cooling equipment and high thermal conductivity fluid composites.
Main Methods:
- Molecular dynamics simulations were employed to analyze interfacial heat transport.
- The influence of varying oil flow velocities on interfacial thermal resistance was studied.
- The effect of functionalized carbon nanotubes on oil thermal conductivity and distribution was examined.
Main Results:
- Interfacial thermal resistance decreased with increasing oil flow velocity, with significant reductions observed up to 4 m/s.
- A notable increase in interfacial thermal resistance was observed at a copper moving velocity of 1 m/s.
- Functionalized carbon nanotubes substantially enhanced oil thermal conductivity, with improvements up to 101.98%, and improved CNT distribution within the oil.
Conclusions:
- Optimizing oil flow rate is critical for reducing interfacial thermal resistance in CT tube cooling.
- Functionalized carbon nanotubes are effective in enhancing the thermal conductivity of cooling oils.
- The findings offer valuable insights for developing advanced liquid cooling solutions and high-performance thermal fluids.
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