Thermal Analysis of Nanofluids on the Thin Film Evaporation of Meniscus

Thermal Analysis of Nanofluids on the Thin Film Evaporation of Meniscus
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纳米流体对弯液面薄膜蒸发的热分析

DOI:
10.1002/htj.21177
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发表时间:
2016-09
期刊:
Heat Transfer—Asian Research
影响因子:
--
通讯作者:
林俊
林俊
中科院分区:
其他
文献类型:
--
作者:
陈威;林俊

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建立了预测薄膜区蒸发的数学模型,得到了薄膜厚度、单位长度传热量和薄膜区总传热量的解析解。这些解析解表明,较高的热通量通过薄膜区域发生由于较高的热导率。当温差和薄膜厚度的增加对热通量q的影响保持相等时,出现最大蒸发速率。纳米流体用作工作流体,该纳米流体是纳米颗粒(1nm至100nm)和基液(纳米颗粒流体悬浮液)的胶体混合物。在一定范围内,纳米颗粒体积分数的增加会降低纳米流体的运动粘度,增加纳米流体的热导率,从而影响薄膜区的蒸发。由于纳米流体的运动粘度和热导率的不同,不同类型纳米流体的薄膜区域的单位长度传热率和总热流密度表现出不同的特征。
A mathematical model for predicting evaporation in the thin film region was developed and its analytical solutions were obtained for thin-film thickness, the heat transport per unit length and the total heat flux transport in the thin-film region. These analytical solutions show that the higher heat flux through the thin film region occurs due to the higher superheat. The maximum evaporative rate occurs when the effects of the increase in the temperature difference and in the thin film thickness on the heat flux q stay equal. A nanofluid, which is a colloidal mixture of nanoparticles (1 nm to 100 nm) and a base liquid (nanoparticle fluid suspensions), is employed as the working fluid. In a certain range, increasing the volume fraction of nanoparticles in the base fluid leads to decreasing the kinematic viscosity of the nanofluid and increasing the thermal conductivity, which influences the evaporation in the thin film region. The heat transfer rate per unit length and the total heat flux in the thin film region display various characteristics among the different type of nanofluids due to the differences of the kinematic viscosity and the thermal conductivity.
DOI: 10.1016/s0017-9310(02)00541-0
发表时间: 2003-06
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