Heat transfer during the boiling of acetone and ethyl alcohol in a thermosiphon with porous capillary structures on the heat-transfer face

It is shown experimentally that heat transfer during boiling on a 0.004-m-diameter heat-transfer surface of a thermosiphon conforms to the rules established for the case of boiling in a large volume. The heat transfer is shown to become unstable in the presence of brass screens on the heat-transfer surface. Considerable intensification and stabilization of the boiling process are achieved by using a perforated Teflon plate with a free section ratio of 0.44 as a porous capillary structure on the heat-transfer surface. For this case, heat transfer equations valid for the temperature head range 3-30 K are obtained.