Pool boiling enhancement with feeder channels supplying liquid to nucleating regions
A boiling heat transfer unit includes a substrate having a heat exchange region including a plurality of nucleating regions adjacent to feeder channels, wherein adjacent nucleating regions are separated by the feeder channels at a distance whereby vapor formed in the nucleating regions is moved away from the nucleating regions influencing liquid flow through the feeder channels towards the nucleating regions thereby establishing continuous self-sustaining separate vapor and liquid pathways increasing heat transfer due to developing region heat transfer in the feeder channels and enhancing overall boiling performance.
1. A boiling heat transfer unit comprising a substrate having a heat exchange region comprising a plurality of nucleating regions, each having a channel length and intersecting with open feeder channels having a length along the substrate surface, wherein the intersecting nucleating regions are disposed in a manner at the ends of the length of the feeder channels at a distance whereby vapor formed in the nucleating regions is moved away from the nucleating regions influencing liquid flow through the length of the feeder channels towards the nucleating regions suppressing nucleation along the length of the feeder channels and establishing continuous self-sustaining spatial ordering of separate vapor and liquid pathways increasing heat transfer due to developing region heat transfer in the feeder channels and enhancing overall boiling performance.
2. The boiling heat transfer unit of claim 1 , wherein adjacent nucleating regions are separated by the feeder channels at a distance of between about 1 mm to about 10 mm.
3. The boiling heat transfer unit of claim 1 , wherein the width of the nucleating region is a distance within a range from about 5 μm to about 4 mm.
4. The boiling heat transfer unit of claim 1 , wherein the width of the feeder channel is a distance within a range from about 5 μm to about 4 mm.
5. The boiling heat transfer unit of claim 1 , wherein the depth of the feeder channel is from above 0 mm to about 10 mm.
6. The boiling heat transfer unit of claim 1 , wherein the adjacent nucleating regions are separated by the feeder channels at a distance of between about 50 percent to about 200 percent of an estimation of the departure bubble diameter.