scholarly journals Effect of the Permeability of the Porous Shell on the Vapor Film Thickness During Boiling of Superfluid Helium in Microgravity

2015 ◽  
Vol 56 (4) ◽  
Keyword(s):  
Film Thickness ◽  
Superfluid Helium ◽  
Vapor Film ◽  
Porous Shell

scholarly journals Boiling of He-II on a cylindrical heater inside a porous shell with constant operation condition

2021 ◽  
Vol 2057 (1) ◽  
pp. 012055
Author(s):  
P V Korolyov ◽  
I A Yachevsky ◽  
I V Volodin
Keyword(s):  
Vapor Pressure ◽  
Superfluid Helium ◽  
Film Boiling ◽  
Vacuum System ◽  
Experimental Setup ◽  
Operation Condition ◽  
Helium Ii ◽  
Porous Shell ◽  
Constant Operation ◽  
Helium Vapor

Abstract This paper presents new efforts undertaken in the study of boiling in superfluid helium on the surface of a cylindrical heater located along the axis in a cylindrical cavity inside a porous shell. New experimental results are obtained with maintaining constant temperature of the helium-II and helium vapor pressure. The modernization of the experimental setup and vacuum system carried out to obtain a series of longer experiments with maintaining a stationary state are described. The basic experimental configurations are specified. Visualization of helium-II film boiling in constant operation condition is represented.

The stability of vapor film immersed in superfluid helium on the surface of the hot ball

2016 ◽  
Vol 230 (6) ◽  
pp. 433-439 ◽  
Author(s):  
Ali Jahangiri ◽  
Mojtaba Biglari
Keyword(s):  
Thin Film ◽  
Heat Flux ◽  
Numerical Method ◽  
Critical Heat Flux ◽  
Superfluid Helium ◽  
Spherical Shape ◽  
Vapor Film ◽  
The Stability

In this article, the evolution of vapor film on the surfaces of hot objects immersed in a cryogenic superfluid helium liquid is considered. It is assumed that at the beginning of the process, a thin film of steam exists on the surface of the object that has a spherical shape. If the heat flux is greater than the critical heat flux, the growth of vapor film will continue, otherwise it will collapse. Survey and analysis of the previously mentioned problem has been done using numerical method and the main onjectives are as follows: (a) study the evolution of the vapor film immersed in superfluid helium on the surface of the hot ball and (b) the stability of vapor film immersed in superfluid helium on the surface of the hot ball.

Sign in / Sign up

Export Citation Format

Share Document