A new method of determining the convective heat-transfer coefficient
Until now, the cooling channels were assumed to have a uniform heat-transfer coefficient
throughout the mold.
Low NTU values were caused by the small heat transfer area of the tested heat exchangers, despite the high overall heat-transfer coefficient
In addition, because the NTU is inversely proportional to the Re, it follows that a small improvement in the overall heat-transfer coefficient
would be accompanied by a decrease of the NTU and the efficiency.
Nenad Miljkovic, a doctoral student at the university, and colleagues in the device research laboratory, have designed a surface coating that has an increased heat-transfer coefficient
In a similar manner, the effect of heat transfer is the heat-transfer coefficient
, which is defined as the quantity of heat passing through a unit area of material, of a unit thickness, in a specific unit of time, when one side differs by 10 Kelvin.
Purdue University researchers have shown that the technology increased the heat-transfer coefficient
, which describes the cooling rate, by as much as 250 percent.
The software can be used to compute flow rate, pressure drop, and heat-transfer coefficient
in fluid transport devices.
This gives you the overall heat-transfer coefficient
, which is the heat transfer between the polymer and the cooling medium.
the COP increases due to higher heat-transfer coefficient
corresponding to higher velocity.
Users plug in the profile shape and material, and the computer simulates the cooling time needed by calculating the convection heat-transfer coefficient
from the profile into the coolant, while taking into account how profile mechanical properties are impacted by specific cooling times.
Then there is a heat-transfer coefficient
for the "gap" between the polymer and the roll surface.