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Application of functionalized nanofluid in thermosyphon
1School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, People's Republic of China. liuzhenh@sjtu.edu.cn.
Nanoscale Research Letters
|August 18, 2011
Summary
Surface-functionalized silica nanofluid offers long-term stability for thermosyphons. Unlike traditional nanofluids, it enhances heat transfer without forming a deposition layer, though maximum heat flux remains unaffected.
Area of Science:
- Materials Science
- Heat Transfer Engineering
- Nanotechnology
Background:
- Nanofluids, suspensions of nanoparticles in a base fluid, are explored for enhanced thermal properties.
- Silica nanoparticles are commonly used but can lead to sedimentation and surface fouling.
- Surface functionalization aims to improve nanofluid stability and performance.
Purpose of the Study:
- To investigate the thermal performance of a water-based functionalized silica nanofluid in a thermosyphon.
- To compare its performance against a traditional (unfunctionalized) silica nanofluid.
- To understand the role of surface deposition on thermal characteristics.
Main Methods:
- Fabrication of a stable, water-based functionalized silica nanofluid.
- Experimental testing of the functionalized nanofluid in a thermosyphon under steady operating pressures.
- Comparative testing using a traditional silica nanofluid under identical conditions.
Main Results:
- Functionalized nanofluid exhibited long-term stability with no sedimentation.
- A porous deposition layer formed on the heated surface with traditional nanofluid, but not with functionalized nanofluid.
- Functionalized nanofluid improved the evaporating heat transfer coefficient.
- Traditional nanofluid enhanced maximum heat flux but degraded the heat transfer coefficient.
- The deposition layer was identified as the primary factor influencing thermal performance.
Conclusions:
- Surface functionalization of silica nanoparticles prevents fouling and enhances heat transfer in thermosyphons.
- The absence of a deposition layer is crucial for improved thermal performance.
- Functionalized nanofluids present a viable alternative to traditional nanofluids for specific heat transfer applications.
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