化工学报 ›› 2019, Vol. 70 ›› Issue (11): 4199-4206.DOI: 10.11949/0438-1157.20190476
收稿日期:
2019-05-07
修回日期:
2019-08-13
出版日期:
2019-11-05
发布日期:
2019-11-05
通讯作者:
胡定华
作者简介:
金铭(1995—),女,硕士研究生,基金资助:
Ming JIN(),Dinghua HU(
),Qiang LI,Desong FAN
Received:
2019-05-07
Revised:
2019-08-13
Online:
2019-11-05
Published:
2019-11-05
Contact:
Dinghua HU
摘要:
纳米流体液滴蒸发现象在电子设备冷却、喷墨打印以及医学检测等领域都有广泛应用。为了研究水基Al2O3纳米流体液滴的蒸发特性,建立了纳米流体液滴蒸发的二维瞬态模型,考虑了纳米颗粒输运行为以及液滴内部流动的影响,并采用任意拉格朗日-欧拉法(ALE)捕捉气液运动界面。基于所建立的模型,分析了水基Al2O3纳米流体液滴内部Marangoni流、纳米颗粒初始浓度以及基板温度对纳米流体液滴蒸发特性的影响规律。结果表明,液滴内部Marangoni流会影响气液界面温度分布和蒸发速率。由于液滴内部纳米颗粒浓度分布和气液界面温度发生变化,纳米流体液滴的蒸发速率随着纳米颗粒初始浓度和基板温度升高而增加。
中图分类号:
金铭, 胡定华, 李强, 范德松. Al2O3纳米流体液滴蒸发特性的数值模拟研究[J]. 化工学报, 2019, 70(11): 4199-4206.
Ming JIN, Dinghua HU, Qiang LI, Desong FAN. Simulation of sessile nanofluid droplet evaporation character[J]. CIESC Journal, 2019, 70(11): 4199-4206.
材料名称 | 密度/(kg/m3) | 比热容/ (J/(kg·K)) | 热导率/ (W/(m·K)) | 动力黏度/(Pa·s) |
---|---|---|---|---|
纳米流体 | 997 | c nf ① | k nf ② | μ nf ③ |
硅 | 2329 | 0.79 | 130 | — |
空气 | 30 | 0.80 | 0.03 | 2×10-5 |
表1 物性参数
Table 1 Physical properties
材料名称 | 密度/(kg/m3) | 比热容/ (J/(kg·K)) | 热导率/ (W/(m·K)) | 动力黏度/(Pa·s) |
---|---|---|---|---|
纳米流体 | 997 | c nf ① | k nf ② | μ nf ③ |
硅 | 2329 | 0.79 | 130 | — |
空气 | 30 | 0.80 | 0.03 | 2×10-5 |
网格数 | 最大单元尺寸/μm | 最大相对偏差/% |
---|---|---|
21157 | 7.5 | — |
32059 | 5 | 1.09 |
38787 | 4 | 0.079 |
表2 网格无关性验证
Table 2 Verification of grid independence
网格数 | 最大单元尺寸/μm | 最大相对偏差/% |
---|---|---|
21157 | 7.5 | — |
32059 | 5 | 1.09 |
38787 | 4 | 0.079 |
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