The growth of a vapor bubble in a superheated liquid is controlled by three factors: the inertia of the liquid, the surface tension, and the vapor pressure. As the bubble grows, evaporation takes place at the bubble boundary, and the temperature and vapor pressure in the bubble are thereby decreased. The heat inflow requirement of evaporation, however, depends on the rate of bubble growth, so that the dynamic problem is linked with a heat diffusion problem. Since the heat diffusion problem has been solved, a quantitative formulation of the dynamic problem can be given. A solution for the radius of the vapor bubble as a function of time is obtained which is valid for sufficiently large radius. This asymptotic solution covers the range of physical interest since the radius at which it becomes valid is near the lower limit of experimental observation. It shows the strong effect of heat diffusion on the rate of bubble growth. Comparison of the predicted radius‐time behavior is made with experimental observations in superheated water, and very good agreement is found.

The growth of vapor bubbles in superheated liquids. report no. 26-6

Computations of boiling flows

The recent advent of reliable thermocouple pairs of high melting point has provided new capabilities for high temperature gas measurement. The errors involved in such measurements using fine wire t...

Measurement of High Gas Temperatures with Fine Wire Thermocouples

http://amet-me.mnsu.edu/UserFilesShared/SolarWall/Technical%20Papers%20and%20%20Documents/Flat%20Plate%20Collector/A%20review%20on%20roughness%20geometry%20used%20in%20solar%20air%20heaters%20-%20Varun,%20R.P.%20Saini,%20S.K.%20Singal.pdf

A review on roughness geometry used in solar air heaters

Design and material issues for high performance SiCf/SiC-based fusion power cores

https://publikationen.bibliothek.kit.edu/270005423/3810768

Heat transfer and friction coefficients for turbulent flow of air in smooth annuli at high temperatures

This paper presents the main design features, their rationale, and the main critical issues for the development, of the four DEMO-relevant blanket concepts presently being investigated within the framework of the European Test-Blanket Development Programme.

Breeding blanket for DEMO

Measurements of the effective thermal conductivity of a Li4SiO4 pebble bed

The growth of vapor bubbles in superheated sodium

This paper presents an overview of the activities within European laboratories on the development of breeding blankets for a DEMO reactor which are presently focused on the two selected blanket lines, the Water-Cooled Lithium–Lead (WCLL) blanket and the Helium-Cooled Pebble-Bed (HCPB) blanket. In particular the paper describes the design of the DEMO blanket segments and sub-systems layout, the status of the associated R&D, the preliminary design of the derived test-modules and sub-systems for testing in ITER. The outline of the near-future activities mainly focused on the development of the two EU ITER Test Modules is also discussed.

M. Dalle Donne

Papers

Heat transfer and friction coefficients for turbulent flow of air in smooth annuli at high temperatures

Breeding blanket for DEMO

Measurements of the effective thermal conductivity of a Li4SiO4 pebble bed

The growth of vapor bubbles in superheated sodium

Status of the European breeding blanket technology