Session 2H: Delaying Leidenfrost Film Formation through use of Hydrophillic Surfaces
Session Number
Session 2H:3rd Presentation
Advisor(s)
Neelesh Patankar, Northwestern University
Location
Room B101
Start Date
28-4-2017 10:00 AM
End Date
28-4-2017 11:15 AM
Abstract
Boiling water on a heated solid surface has taken a fundamental role in everyday life, and occurs in many industrial processes. However, at extremely high temperatures, heat transfer between a solid surface and liquid water decreases due to the formation of a gas phase acting as an insulator between the liquid water and the hot surface. In addition, a sudden collapse of this gaseous layer may damage high-end machinery. For example, As a result, it is advantageous to sustain liquid in contact with the surface during boiling to delay film formation and increase heat transfer within the system. In this work, we utilize molecular dynamics simulations to verify how surface roughness and hydrophillicity can delay the onset of the Leidenfrost point. Temperature and pressure distributions of our system as well as a liquid vapor interface tracking demonstrated a phase separation of water, and confirmed the formation of the Leidenfrost layer. Our models open up new approaches in developing materials that better counteract the Leidenfrost phenomenon and improve heat transfer. Applications of this study range from safely cooling down nuclear reactors in power plants to maximizing heating efficiency in industrial boilers.
Session 2H: Delaying Leidenfrost Film Formation through use of Hydrophillic Surfaces
Room B101
Boiling water on a heated solid surface has taken a fundamental role in everyday life, and occurs in many industrial processes. However, at extremely high temperatures, heat transfer between a solid surface and liquid water decreases due to the formation of a gas phase acting as an insulator between the liquid water and the hot surface. In addition, a sudden collapse of this gaseous layer may damage high-end machinery. For example, As a result, it is advantageous to sustain liquid in contact with the surface during boiling to delay film formation and increase heat transfer within the system. In this work, we utilize molecular dynamics simulations to verify how surface roughness and hydrophillicity can delay the onset of the Leidenfrost point. Temperature and pressure distributions of our system as well as a liquid vapor interface tracking demonstrated a phase separation of water, and confirmed the formation of the Leidenfrost layer. Our models open up new approaches in developing materials that better counteract the Leidenfrost phenomenon and improve heat transfer. Applications of this study range from safely cooling down nuclear reactors in power plants to maximizing heating efficiency in industrial boilers.
Comments
Additional team members: Tom Zhao