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Flow Analysis Using the Schlieren Method in Electrospray Deposition
New Phys.: Sae Mulli 2020; 70: 322~326
Published online April 29, 2020;
© 2020 New Physics: Sae Mulli.

Hye Jin HA1, Sung Youp LEE2,Hyeong Rag LEE2,Hong Tak KIM2*

1Department of Science Education, Kyungpook National University, Daegu 41566, Korea
2Department of Physics, Kyungpook National University, Daegu 41566, Korea
Correspondence to:
Received December 7, 2019; Revised February 13, 2020; Accepted February 26, 2020.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this study, four polar solvents with different properties (methanol, ethanol, 2-propanol, distilled water) were sprayed at different substrate temperatures by using the electrospray method. The flow changes for each solvent were visualized by using the Schlieren method, and the acquired images were analyzed by using a two-dimensional fast Fourier transformation (2D-FFT) technique. The applied voltage at cone-jet mode showed different values depending on the type of solvent, and the spraying angle at the cone-jet mode was closely related to the viscosity of the solvent. The flow due to substrate heating was mainly due to a convection process, and strong flows were observed on the heating plate with increasing temperature. We confirmed that these flows could be easily visualized by using the Schlieren technique and that the acquired images could be qualitatively analyzed by using 2D-FFT. Consequently, the 2D-FFT technique is expected to be useful for the analysis of various flows, as well as the analysis of air flow.
PACS numbers: 81.15.Rs, 42.79.Mt, 02.30.Nw
Keywords: Electrospray, Schlieren, Electrospray angle, Fourier transform

May 2020, 70 (5)
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