SGER: Experimental Investigation of Transport Phenomena in Buoyancy Driven Nanofluids

对浮力驱动纳米流体(BDNF)体系的输运现象进行了初步的实验研究。纳米流体是将纳米颗粒悬浮在常规换热流体中而形成的一种新型换热流体。纳米粒子的存在改变了传统流体的输运性质，从而提高了纳米流体的有效导热系数。浮力驱动纳米流体系统在MEMS和电子热管理以及发动机冷却系统、超导磁体和其他冷却应用中具有潜在的应用前景。这项研究的目的是建立经验关联式，用于预测含有BDNF的封闭空间中的热传递，并为更长期的研究工作奠定基础，以了解BDNF中热传递的基本原理。这一初步研究的结果将作为参数实验研究的基础，这些参数包括流体和纳米粒子的体积分数、热物性、长径比、体积膨胀系数和纳米流体的速度等参数对浮力驱动纳米流体强化换热的影响。这些信息对确定浮力驱动的纳米流体的热性能，以及设计用于电子和其他工程系统冷却的纳米流体热传递系统具有实际意义。

A preliminary experimental investigation is proposed to study the transport phenomena in Buoyancy-Driven Nanofluid (BDNF) system. Nanofluids are a new class of heat transfer fluid engineered by suspending nanoparticles in the conventional heat transfer fluid. The presence of the nanoparticles changes the transport properties of the conventional fluid thereby increasing the effective thermal conductivity of nanofluid. Buoyancy-driven nanofluid systems have potential applications in the MEMS and electronics thermal management, as well as in engine cooling systems, superconducting magnets, and other cooling applications. The objectives of this study are to develop empirical correlations for predicting the heat transfer in enclosures that contain BDNF and to lay the foundations for a longer term research effort to understand the fundamentals of thermal transport in BDNF. The outcome of this preliminary investigation will serve as groundwork for parametric experimental studies on the influence of parameters such as volume fraction, thermophysical properties of the fluid and nanoparticles, aspect ratio, volumetric expansion coefficient, and velocity of the nanofluids on heat transfer enhancement of buoyancy-driven nanofluids. This information is of practical relevance in determining the thermal performance of buoyancy-driven nanofluids, and designing nanofluid heat transfer systems for cooling of electronics and other engineering systems.