An Analysis of the Heat Transfer Performance of Nanofluids
| Autor: | Cheng-Li Hsu, 徐健力 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 Low thermal conductivity is a primary limitation in the development of energy-efficient heat transfer fluids required in many industrial applications. To overcome this limitation, a new class of heat transfer fluids is being developed by suspending nanocrystalline particles in liquids such as water or oil. The resulting “nanofluids” possess extremely high thermal conductivities compared to the liquids without dispersed nanocrystalline particles. In this paper, we will analysis the performance of the nanofluids, and research some factors that affect the performance of the nanofluids, for example, the volume fraction、size、shape、properties etc. We also introduce the fundamental equation of 4 individual situations that can predict the heat transfer performance of the nanofluids, including with axial and radial heat transfer and without axial heat transfer. We can find that the performance of the nanofluids is better than that of the normal fluids, not only because it’s high thermal coefficient but also because the random movement and dispersion of the nanocrystalline. We can use the Peclet number to describe the affect of these factors and find that Nusselt number is increasing with Peclet number, that is, the higher the Peclet number of the nanofluids is the better the performance of heat transfer will be. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|