Droplet impingement on coated incline heated surface

The investigation into the hydrodynamic phenomena of droplet impact on inclined heated surfaces has garnered significant interest, driving extensive research efforts. Advances in surface engineering, propelled by modern technology, have facilitated the development of surfaces with diverse properties...

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Main Author: Nai, Ze Yuan
Other Authors: Fei Duan
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/176054
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1760542024-05-18T16:52:27Z Droplet impingement on coated incline heated surface Nai, Ze Yuan Fei Duan School of Mechanical and Aerospace Engineering FeiDuan@ntu.edu.sg Engineering Droplet impingement Incline heated surface The investigation into the hydrodynamic phenomena of droplet impact on inclined heated surfaces has garnered significant interest, driving extensive research efforts. Advances in surface engineering, propelled by modern technology, have facilitated the development of surfaces with diverse properties. While modified surfaces show promise in addressing engineering challenges associated with droplet impingement, research in this area, particularly concerning the phase change associated with boiling, remains relatively limited. This study focuses on analyzing the hydrodynamic behavior of droplets impacting inclined surfaces coated with nanoparticles and subjected to heating. Experimental observations and theoretical insights into water droplet impingement on coated and heated inclined surfaces are presented. Experimental observations reveal variations in droplet behavior across different setups, with an increasing standard deviation of the Weber number as height increases. Additionally, at higher temperatures, the maximum spreading diameter changes as droplets tend to evaporate upon impingement. Two types of modified heating surfaces, hydrophilic and superhydrophobic, are employed in the experiments, with temperatures ranging from 25°C to 300°C. Across the different inclined surfaces, the spreading factor of droplets exhibits a significant increase, showing an upward trend with increasing Weber numbers, accompanied by distinct hydrodynamic behaviors. On hydrophilic inclined surfaces, droplets display a sequence of behaviors including sticking, stick and spread, spread boil, rebounding with boiling, breakup with splashing, rebounding, and rebounding with breakup, across all Weber numbers. Conversely, droplets on superhydrophobic surfaces experience splashing and rebounding with breakup at low Weber numbers and rebound at high Weber numbers. A unique hydrodynamic behavior is observed on a 30° inclined superhydrophobic surface, where droplets slide off upon impingement. The spreading factors across low-incline surfaces exhibit clustering, while high-incline surfaces display a scattered graph. Future research avenues include exploring variations in surface patterns and wettability modifications, leveraging technological advancements to deepen our understanding in this field. Bachelor's degree 2024-05-13T08:33:59Z 2024-05-13T08:33:59Z 2024 Final Year Project (FYP) Nai, Z. Y. (2024). Droplet impingement on coated incline heated surface. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/176054 https://hdl.handle.net/10356/176054 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Droplet impingement
Incline heated surface
spellingShingle Engineering
Droplet impingement
Incline heated surface
Nai, Ze Yuan
Droplet impingement on coated incline heated surface
description The investigation into the hydrodynamic phenomena of droplet impact on inclined heated surfaces has garnered significant interest, driving extensive research efforts. Advances in surface engineering, propelled by modern technology, have facilitated the development of surfaces with diverse properties. While modified surfaces show promise in addressing engineering challenges associated with droplet impingement, research in this area, particularly concerning the phase change associated with boiling, remains relatively limited. This study focuses on analyzing the hydrodynamic behavior of droplets impacting inclined surfaces coated with nanoparticles and subjected to heating. Experimental observations and theoretical insights into water droplet impingement on coated and heated inclined surfaces are presented. Experimental observations reveal variations in droplet behavior across different setups, with an increasing standard deviation of the Weber number as height increases. Additionally, at higher temperatures, the maximum spreading diameter changes as droplets tend to evaporate upon impingement. Two types of modified heating surfaces, hydrophilic and superhydrophobic, are employed in the experiments, with temperatures ranging from 25°C to 300°C. Across the different inclined surfaces, the spreading factor of droplets exhibits a significant increase, showing an upward trend with increasing Weber numbers, accompanied by distinct hydrodynamic behaviors. On hydrophilic inclined surfaces, droplets display a sequence of behaviors including sticking, stick and spread, spread boil, rebounding with boiling, breakup with splashing, rebounding, and rebounding with breakup, across all Weber numbers. Conversely, droplets on superhydrophobic surfaces experience splashing and rebounding with breakup at low Weber numbers and rebound at high Weber numbers. A unique hydrodynamic behavior is observed on a 30° inclined superhydrophobic surface, where droplets slide off upon impingement. The spreading factors across low-incline surfaces exhibit clustering, while high-incline surfaces display a scattered graph. Future research avenues include exploring variations in surface patterns and wettability modifications, leveraging technological advancements to deepen our understanding in this field.
author2 Fei Duan
author_facet Fei Duan
Nai, Ze Yuan
format Final Year Project
author Nai, Ze Yuan
author_sort Nai, Ze Yuan
title Droplet impingement on coated incline heated surface
title_short Droplet impingement on coated incline heated surface
title_full Droplet impingement on coated incline heated surface
title_fullStr Droplet impingement on coated incline heated surface
title_full_unstemmed Droplet impingement on coated incline heated surface
title_sort droplet impingement on coated incline heated surface
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/176054
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