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Jumping Leidenfrost droplets

Baktash, Mehri LU (2012) FYSM60 20121
Department of Physics
Solid State Physics
Abstract
A leidenfrost droplet forms when a liquid droplet is placed on a very hot
surface. In the case that there is a thin layer of insulating material as a step on the substrate, under specific conditions Leidenfrost droplets interact with the edge of the step. The result of this interaction is sometimes lateral detachment or jumping from the surface. Specically, the best jumping can be observed when liquid nitrogen droplets move on a brass substrate with a piece of plastic tape as a step. This thesis experimentally studies the specific physics of the jumping process.

We examined the effect of the step material, liquid property and the
step height on the jumping process. We hypothesize that the Marangoni
effect, due to thermal gradients... (More)
A leidenfrost droplet forms when a liquid droplet is placed on a very hot
surface. In the case that there is a thin layer of insulating material as a step on the substrate, under specific conditions Leidenfrost droplets interact with the edge of the step. The result of this interaction is sometimes lateral detachment or jumping from the surface. Specically, the best jumping can be observed when liquid nitrogen droplets move on a brass substrate with a piece of plastic tape as a step. This thesis experimentally studies the specific physics of the jumping process.

We examined the effect of the step material, liquid property and the
step height on the jumping process. We hypothesize that the Marangoni
effect, due to thermal gradients contributes to this type of motion. This is evident by comparing the estimated Marangoni flow and measurement flow
rate. (Less)
Please use this url to cite or link to this publication:
author
Baktash, Mehri LU
supervisor
organization
course
FYSM60 20121
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Marangoni effect, Heat transfer, Leidnfrost the effect, Liquid solid interaction, Surface tension
language
English
id
3167726
date added to LUP
2012-11-20 17:27:20
date last changed
2012-11-21 15:58:43
@misc{3167726,
  abstract     = {A leidenfrost droplet forms when a liquid droplet is placed on a very hot
surface. In the case that there is a thin layer of insulating material as a step on the substrate, under specific conditions Leidenfrost droplets interact with the edge of the step. The result of this interaction is sometimes lateral detachment or jumping from the surface. Specically, the best jumping can be observed when liquid nitrogen droplets move on a brass substrate with a piece of plastic tape as a step. This thesis experimentally studies the specific physics of the jumping process.

We examined the effect of the step material, liquid property and the
step height on the jumping process. We hypothesize that the Marangoni
effect, due to thermal gradients contributes to this type of motion. This is evident by comparing the estimated Marangoni flow and measurement flow
rate.},
  author       = {Baktash, Mehri},
  keyword      = {Marangoni effect,Heat transfer,Leidnfrost the effect,Liquid solid interaction,Surface tension},
  language     = {eng},
  note         = {Student Paper},
  title        = {Jumping Leidenfrost droplets},
  year         = {2012},
}