TAILIEUCHUNG - Báo cáo hóa học: " Application of functionalized nanofluid in thermosyphon"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Application of functionalized nanofluid in thermosyphon | Yang and Liu Nanoscale Research Letters 2011 6 494 http content 6 1 494 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Application of functionalized nanofluid in thermosyphon Xue-Fei Yang and Zhen-Hua Liu Abstract A water-based functionalized nanofluid was made by surface functionalizing the ordinary silica nanoparticles. The functionalized nanofluid can keep long-term stability. and no sedimentation was observed. The functionalized nanofluid as the working fluid is applied in a thermosyphon to understand the effect of this special nanofluid on the thermal performance of the thermosyphon. The experiment was carried out under steady operating pressures. The same work was also explored for traditional nanofluid consisting of water and the same silica nanoparticles without functionalization for comparison. Results indicate that a porous deposition layer exists on the heated surface of the evaporator during the operating process using traditional nanofluid however no coating layer exists for functionalized nanofluid. Functionalized nanofluid can enhance the evaporating heat transfer coefficient while it has generally no effect on the maximum heat flux. Traditional nanofluid deteriorates the evaporating heat transfer coefficient but enhances the maximum heat flux. The existence of the deposition layer affects mainly the thermal performance and no meaningful nanofluid effect is found in the present study. Keywords nanofluid surface functionalization thermosyphon heat transfer Introduction The revolution of fabrication technology allows the fabrication of materials at a nano-scale. Nanoparticles fabricated by different methods show various fancy characteristics in electronic magnetic optical and catalytic applications. The concept of the nanofluid which is the suspension of nanoparticles was firstly proposed by Choi 1 . Since then a lot of researches have been carried out to study the heat transfer characteristics of

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