The pitch distance was about 400 nm.
Parameters covered in this study were spiral diameter and spiral pitch distance.
The further reduction of the pitch distance, 1 mm, results in the 250% CHF improvement in agreement with the theory.
Three rib angles were used for different rib geometries with varying pitch distance, an angle of attack and Reynolds number.
By conjunction with study of contact images on various pitch distance micro pillar arrays, the contact angles of micro pillar arrays with pitch distance < 275 μm (in Cassie state) were higher than those of the micro pillar arrays with pitch distance > 275 μm (in Wenzel state).
It is found that the CHF enhancement of the mushroom wick is attributed to its pitch distance, 3.5 mm, which effectively reduce the hydrodynamic instability (Rayleigh-Taylor) wavelength.
Unfortunately it is not possible to increase the fan angle or the pitch distance even further without inducing a coolant separation and a drop in the overall effectiveness.
Micro channels having 186-micron pitch distance and 15-micron height on a substrate of size 15×5.88×0.49 mm is injected and subsequently, debound and sintered successfully.
