Abstract
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.
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