Capillary structure and heat dissipation device thereof

A heat dissipation device comprising:

• a heat dissipation device main body having an internal airtight chamber, a working fluid being filled in the airtight chamber, the heat dissipation device main body having an inner face proximal to the airtight chamber as a condensation face and another inner face proximal to the airtight chamber as an evaporation face, a capillary structure being disposed on a surface of the evaporation face, the capillary structure having a main body having at least one internal closed space, the main body having a top layer formed with multiple passages, the passages passing through the top layer in communication with the closed space, the top layer being not in contact with the condensation face, whereby a two-phase fluid circulation space is defined between the top layer and the condensation face, the closed space being in communication with the two-phase fluid circulation space through the multiple passages;
• and
• multiple column bodies disposed in the closed space, the column bodies and the passages being staggered from each other, wherein a diameter of each of the multiple column bodies is greater than or equal to an aperture size of each of the multiple passages for each of the multiple column bodies entire height.