Heat Transfer and Fluid Flow of Nanofluids in Laminar Radial Flow Cooling Systems

Nanofluids 被认为选择同样有趣到常规冷却剂。传统的液体限制了热转移能力，是众所周知的什么时候与普通金属相比。在传统的液体在暂停放的极其好的金属性的粒子的小数量将更加增加他们的热转移表演，因此是相当想得到的。数字调查进有在内的推迟的金属性的 nanoparticles 的冷却剂的热转移改进能力一光线， laminar 流动冷却配置被介绍。温度依赖 nanofluid 性质从在最近的文学可得到的试验性的数据被评估。结果显示可观的热转移增加与 nanoparticles 的相对小的体积部分的使用是可能的。然而，通常，这些被墙砍压力的可观的增加伴随。结果也证明与温度变量 nanofluid 性质获得的预言产出更大的热转移能力和更低的墙砍当时，强调与用经常的性质的预言相比。关键词 nanofluids - nanoparticles - 热转移 - laminar 流动 - 限制光线的流动 CLC 数字 TK

Nanofluids are considered as interesting alternatives to conventional coolants. It is well known that traditional fluids have limited heat transfer capabilities when compared to common metals. It is therefore quite conceivable that a small amount of extremely fine metallic particles placed in suspension in traditional fluids will considerably increase their heat transfer performances. A numerical investigation into the heat transfer enhancement capabilities of coolants with suspended metallic nanoparticles inside a radial, laminar flow cooling configuration is presented. Temperature dependant nanofluid properties are evaluated from experimental data available in recent literature. Results indicate that considerable heat transfer increases are possible with the use of relatively small volume fractions of nanoparticles. Generally, however, these are accompanied by considerable increases in wall shear-stress. Results also show that predictions obtained with temperature variable nanofluid properties yield greater heat transfer capabilities and lower wall shear stresses when compared to predictions using constant properties.