RT Journal Article ID 2335ed661a530895 A1 Filippeschi, Sauro A1 Franco, Alessandro T1 EXPERIMENTAL ANALYSIS OF HEAT AND MASS TRANSFER IN SMALL DIMENSION, TWO-PHASE LOOP THERMOSYPHONS JF Heat Pipe Science and Technology, An International Journal JO HPST YR 2010 FD 2010-12-03 VO 1 IS 2 SP 163 OP 182 K1 two-phase loop thermosyphon K1 boiling K1 phase change K1 confined bubble nucleation AB This paper analyzes the thermo-fluid dynamics of compact two-phase loops with natural circulation which are mainly ruled by the heat input supplied to the evaporator. The objective is to understand if in small two-phase thermosyphons the heat-transfer performances are only due to the heat transfer in the evaporator section rather than the fluid-dynamic characteristics of the entire loop. The results of the experimental analysis are obtained with water and FC72 and with two different types of loop thermosyphons. The first, type A, is characterized by the evaporator internal diameter much larger than the bubble diameter, while in the second, type B, evaporator and connecting pipes have diameters 4−5 times larger than the bubble diameter. For both thermosyphons capillary forces are not involved in the heat and mass transfer. For the type A thermosyphon the performances are mainly influenced only by the heat-transfer regime in the evaporator section, and in type B thermosyphons, the performances are influenced by the fluid-dynamic characteristics of the whole loop, and mainly by the mass flow rate. PB Begell House LK https://www.dl.begellhouse.com/journals/4b0844fc3a2ef17f,2e4751912dea98ba,2335ed661a530895.html