纳米流体
材料科学
雷诺数
喷射(流体)
传热
传热系数
沉积(地质)
机械
体积分数
粒子(生态学)
纳米颗粒
热力学
复合材料
纳米技术
湍流
物理
沉积物
地质学
古生物学
海洋学
生物
作者
Shengnan Chang,Jizu Lv,Peng Wang,Ming Bai
标识
DOI:10.1080/10407782.2023.2175085
摘要
Based on the two-body collision model, a nanoparticle collision, deposition and peeling model is established to describe the nanoparticle deposition process during SiO2-water nanofluid jet impinging on a heated copper column. The model is loaded with the Euler-Lagrange multiphase model in Ansys Fluent 19.1, and its accuracy is verified by comparing with the experimental data. Then the nanoparticle deposition processes during nanofluid jet impinging are studied with different inlet Reynolds numbers (Re), nanofluid volume fractions and impact heights (H/D). Result shows that the amount of nanoparticle deposition increases with the increasing nanofluid volume fraction, and it has a tendency of first increasing and then decreasing with the increasing inlet Reynolds number and the impact height, which reaches a maximum value when Re = 8849 and H/D = 4. Result also shows that it is easier to deposit at the junction between the impact zone and the wall jet zone with a deposition amount approximately 2 times of that at the outlet. A nanoparticle thermal resistance layer and a high-density nanofluid layer are formed in the near-wall region, and velocity slip between phases in the layer could reach 2.824m/s, which significantly enhance the base-fluid’s micro-flow intensity and the particles’ movement, thus strengthening the momentum exchange and energy exchange between phases and wall. The maximum heat transfer coefficient could reach 27857.4 W/(K·m2), and the average heat transfer coefficient has a 67.9% increment with 3% SiO2-water nanofluid volume fraction.
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