School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, People's Republic of China.
Nanoscale Res Lett. 2011 Aug 16;6(1):494. doi: 10.1186/1556-276X-6-494.
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.
通过对普通二氧化硅纳米粒子进行表面功能化，制备了一种水基功能化纳米流体。功能化纳米流体可以保持长期稳定，没有观察到沉淀。将功能化纳米流体作为工作流体应用于热虹吸管中，以了解这种特殊纳米流体对热虹吸管热性能的影响。实验在稳定的工作压力下进行。同样的工作也探索了传统纳米流体（由水和相同的未经功能化的二氧化硅纳米粒子组成）进行比较。结果表明，在使用传统纳米流体的工作过程中，蒸发器的加热表面存在多孔沉积层；然而，对于功能化纳米流体，不存在涂层。功能化纳米流体可以增强蒸发传热系数，而对最大热通量通常没有影响。传统纳米流体降低了蒸发传热系数，但提高了最大热通量。沉积层的存在主要影响热性能，在本研究中没有发现有意义的纳米流体效应。
