There is no published literature about nucleate pool boiling heat transfer characteristics of a refrigerant/oil mixture on a metal foam cover at oil concentrations of more than 5%, and the research on the influence of oil at the concentration of more than 5% is only done on plain surfaces or tubes.
Figure 1 shows the experimental equipment for testing the nucleate pool boiling heat transfer characteristics of a refrigerant/oil mixture on metal foam covers.
In many papers the transient heat conduction is recognized as the most important mechanism of heat transfer in the nucleate boiling.
To quantify convective effects caused by bubble activity a partial nucleate boiling has been investigated experimentally using PIV measurement technique.
The significant decrease in local heat transfer coefficients is considered due to the nucleate boiling being suppressed by the oil film.
This implies that the flow boiling heat transfer is dominated by nucleate boiling in this case too.
Particles that are pushed by the solidification front nucleate
pores while those inclusions engulfed by the front don't affect porosity content.
condensation physics works extremely well with very tiny particles and is so rapid and efficient that it suggests that the TIPS process will be less costly than current atmospheric or low-pressure systems with comparable emmissions performance.
There is a narrow processing window, as the carbon dioxide wants to nucleate
prematurely or come out of the melt solution," he says.
The addition of mineral and organic particulate to isotactic polypropylene has been found to both nucleate
the crystallization and induce the occurrence of different crystallographic forms [12-18].
In the experiments, it was clear from metallographic observations and electron backscattering diffraction analysis that in high purity Al-Si binary alloys, the Al-Si eutectic usually nucleates
from the surface aluminum dendrites.
The most powerful nucleates
for hydrogen precipitation are oxides--especially those that trap gaseous phases through turbulence in gating, pouring, melt handling and treatment.