Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/145908
Title: Hydrodynamic pattern transition of droplet train impinging onto heated titanium substrates with or without nanotube coating
Authors: Shen, Suping
Tong, Wei
Duan, Fei
Keywords: Engineering
Issue Date: 2020
Source: Shen, S., Tong, W., & Duan, F. (2020). Hydrodynamic pattern transition of droplet train impinging onto heated titanium substrates with or without nanotube coating. International Journal of Heat and Mass Transfer,
Journal: International Journal of Heat and Mass Transfer 
Abstract: The impingement of ethanol droplet train on the heated titanium substrates without or with the titanium oxide nanotube coating has been experimentally investigated in close view. The coating makes the substrate with high wettability. Four distinct but steady hydrodynamic patterns are observed on both two surfaces, namely, liquid aggregation and crown periphery instability; sub-droplet splashing and crown periphery instability; splashing and stable crown; and splashing with stable angle. However, the more wetting nanotube coated substrates push the transition between the patterns to a higher temperature. The quantitatively analysis of spreading length, diameter and height of crown and stable splashing angle further proved the transitions between the hydrodynamic patterns on the two titanium surfaces. The instability at the crown periphery may result from the low surface tension of the working fluids in first and second patterns, while the crown becomes stable on the third pattern. In the fourth pattern, a sharp shift of the splashing angle from decreasing to increasing is found at the surface temperature of 323 ∘C and 404 ∘C for the bare titanium surface and the nanotube coated surface, respectively. The shift could be attributed to the emergence of Leidenfrost effect. It is found that the Leidenfrost point at the droplet train impingement on the nanotube coated surface has been remarkably delayed.
URI: https://hdl.handle.net/10356/145908
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2020.120409
Rights: © 2020 Elsevier Ltd. All rights reserved. This paper was published in International Journal of Heat and Mass Transfer and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20221201
Fulltext Availability: With Fulltext
Appears in Collections:SC3DP Journal Articles

Files in This Item:
File Description SizeFormat 
Hydrodynamic pattern transition of droplet train impinging onto heated titanium substrates with or without nanotube coating.pdf
  Until 2022-12-01
1.76 MBAdobe PDFUnder embargo until Dec 01, 2022

Page view(s)

164
Updated on May 16, 2022

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.