Nanofluid Al2O3–H2O evaporation: energy and deposition patterns

Tianying Li (1) , Bin Liu (1) , Xiaoyan Ma (2) , Rachid Bennacer (2)

1 Tianjin University of Commerce
2 LMT - Laboratoire de Mécanique et Technologie

This study experimentally investigated the deposition patterns of Al2O3–H2O nanofluid droplets with mass concentration of 0.05%, 0.2%, 1% and 3% after evaporating on transparent glass substrate with temperature of 30 °C, 40 °C, 50 °C and 60 °C, obtaining three typical kinds of patterns: the peripheral ring, the thin uniform layer with a thicker ring at the periphery and the concentric circular respectively. With the increase of concentration, the uniform pattern embedded in the peripheral ring changes into a concentric circular pattern gradually. The flow velocities corresponding to the three typical forces were solved and the results are 10−3 < Vma/Vrad − a < 10−2 and 10−28 < VDLVO+/Vrad − a < 10−5 (Marangoni, Vma, the integral mean value of the entire radius Vrad − a and the velocity caused by DLVO force VDLDO+). This indicated that the radial flow played a dominant role in the formation of the deposition pattern.

Domaines: Matière Condensée [cond-mat]

Tianying Li, Bin Liu, Xiaoyan Ma, Rachid Bennacer. Nanofluid Al2O3–H2O evaporation: energy and deposition patterns. European Physical Journal: Applied Physics, 2018, Materials for Energy harvesting, conversion and storage (Icome 2017), 83 (1), pp.10903. ⟨10.1051/epjap/2018180082⟩. ⟨hal-02076685⟩