Study of droplet impact on constant surface temperature

The phenomenon of liquid droplets impinging on solid surface is encountered in a number of areas related to various types of combustion engines, cooling systems as well as many fire safety situations. By studying the dynamic process of droplet spreading upon impingement on a heated surface, will fur...

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Main Author: Tan, Yunn Boon.
Other Authors: Wong Teck Neng
Format: Final Year Project
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/16172
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-161722023-03-04T18:15:58Z Study of droplet impact on constant surface temperature Tan, Yunn Boon. Wong Teck Neng School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics The phenomenon of liquid droplets impinging on solid surface is encountered in a number of areas related to various types of combustion engines, cooling systems as well as many fire safety situations. By studying the dynamic process of droplet spreading upon impingement on a heated surface, will further allow the author to relate the physical droplet dynamics to its heat transfer characteristic. The author has designed and fabricated a constant copper surface temperature set-up with a chamber to simulate a one dimensional heating surface. A circular heating surface with an area of 490mm² made of copper and powered by a single 300W heater cartridge was designed and built. Solid State Relay is use to enable the heater cartridge to maintain constant temperature through a feedback from the thermocouple. The impact of a water droplet upon a heated copper surface was investigated experimentally using a high-speed digital camera. The droplet impact height was varied from 20mm to 60mm and the collision dynamics were investigated with the temperature of the copper surface varied from 26ºC to 170ºC. For each height, the evolution of the maximum spreading diameter and maximum recoil height was measured as a function of surface temperature. When temperature increases above 100ºC, the liquid film was observed to recoil higher and the maximum droplet spreading starts to become unstable. At certain point, the Leidenfrost effect was observed. Bachelor of Engineering (Mechanical Engineering) 2009-05-22T04:11:39Z 2009-05-22T04:11:39Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16172 en Nanyang Technological University 93 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Tan, Yunn Boon.
Study of droplet impact on constant surface temperature
description The phenomenon of liquid droplets impinging on solid surface is encountered in a number of areas related to various types of combustion engines, cooling systems as well as many fire safety situations. By studying the dynamic process of droplet spreading upon impingement on a heated surface, will further allow the author to relate the physical droplet dynamics to its heat transfer characteristic. The author has designed and fabricated a constant copper surface temperature set-up with a chamber to simulate a one dimensional heating surface. A circular heating surface with an area of 490mm² made of copper and powered by a single 300W heater cartridge was designed and built. Solid State Relay is use to enable the heater cartridge to maintain constant temperature through a feedback from the thermocouple. The impact of a water droplet upon a heated copper surface was investigated experimentally using a high-speed digital camera. The droplet impact height was varied from 20mm to 60mm and the collision dynamics were investigated with the temperature of the copper surface varied from 26ºC to 170ºC. For each height, the evolution of the maximum spreading diameter and maximum recoil height was measured as a function of surface temperature. When temperature increases above 100ºC, the liquid film was observed to recoil higher and the maximum droplet spreading starts to become unstable. At certain point, the Leidenfrost effect was observed.
author2 Wong Teck Neng
author_facet Wong Teck Neng
Tan, Yunn Boon.
format Final Year Project
author Tan, Yunn Boon.
author_sort Tan, Yunn Boon.
title Study of droplet impact on constant surface temperature
title_short Study of droplet impact on constant surface temperature
title_full Study of droplet impact on constant surface temperature
title_fullStr Study of droplet impact on constant surface temperature
title_full_unstemmed Study of droplet impact on constant surface temperature
title_sort study of droplet impact on constant surface temperature
publishDate 2009
url http://hdl.handle.net/10356/16172
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