
436 Heat Transfer: Thermal Management of Electronics
tension force, liquid droplets are entrained into the vapor region of the evaporator
and the thermosyphon would be at its entrainment limit. Both the ooding and
the entrainment limits result in the liquid accumulation in the condenser section
and possible dry out of the evaporator section. Dry out limit for a thermosyphon is
reached when the entire uid is circulating throughout the thermosyphon, either
as a falling condensate lm or in the vapor ow, and no pool of liquid is present at
the evaporator section. Dry out starts at the bottom of the evaporator section and
increases in size