ABSTRACT
Thermosyphons and heat pipes are widely used as cooling devices where space is limited or high heat rates have to be led away. Because their design is properly described in several textbooks (i.e., Faghri, 1995; Reay and Kew, 2006), here only some main features are briefly discussed. Figure 14.1 shows the principal sketches of a cylindrical closed two-phase thermosyphon and a cylindrical heat pipe. The majority of experimental and modeling work connected with nanofluids follows these designs. A third type-oscillating heat pipe-is described in the work of Buschmann (2013).
