Natural circulation in two-phase thermosyphon loop heated from below
Closed thermosyphon loops are devices capable of transporting heat through natural convection process. This paper focuses on the steady-state behaviour of two-phase natural circulation loops i.e. thermosyphon loops, in which the density difference of fluid between its liquid and vapour phases is a driving force. The steady-state, one-dimensional model is proposed for two-phase thermosyphon. The presented model based on mass, momentum, and energy balances in the evaporator, rising tube, condenser, and the falling tube. The slip two-phase flow model is used in circulations. The effect of the loop.s aspect ratio (height H to the breadth B) on the mass flow rate at the steady-state is examined numerically. Results show that the mass flow rate increases with increasing aspect ratio H/B. Freon R-11 was chosen as a working fluid in the thermosyphon device.
Bibliogr 14. poz.