Natural Convection of Water-Based Nanofluids in a Square Enclosure with Non-Uniform Heating of the Bottom Wall

• 作者: Ali J. Chamkha Brahim Ben-Beya Nader Ben-Cheikh Taieb Lili
• 来源期刊: 现代物理(英文)
• 学科: 物理学
• 关键词: Natural CONVECTION UNSTEADY State Nanofluids Solid Volume FRACTION Heat Transfer Enhancement
• 年，卷（期）: 2013,（2）
• 页码范围: 147-159
• 页数: 13页
• 分类号: O35

摘要

In this paper, a numerical study of natural convection in a square enclosure with non-uniform temperature distribution maintained at the bottom wall and filled with nanofluids is carried out using different types of nanoparticles. The remaining walls of the enclosure are kept at a lower temperature. Calculations are performed for Rayleigh numbers in the range 5 × 103 ≤ Ra ≤ 106 and different solid volume fraction of nanoparticles 0 ≤ χ ≤ 0.2. An enhancement in heat transfer rate is observed with the increase of nanoparticles volume fraction for the whole range of Rayleigh numbers. It is also observed that the heat transfer enhancement strongly depends on the type of nanofluids. For Ra = 106, the pure water flow becomes unsteady. It is observed that the increase of the volume fraction of nanoparticles makes the flow return to steady state.