A PARAMETRIC STUDY OF FLOW AND HEAT TRANSFER IN CLOSED THERMOSYPHON LOOP

Abstract

In this study, closed loop rectangular thermosyphon was studied parametrically. Two-dimensional numerical model was solved using uniform surface temperature boundary condition in the vertical heated and cooled sections of the thermosyphon loop. In two-dimensional model, results for laminar flow case were obtained by solving the momentum and the energy equations through the SIMPLEX Algorithm. Used parameters are Prandtl numbers, Grashof numbers and H/D which is obtained from the elevation difference between the mid-point of heated and cooled sections divided by inside diameter of the thermosyphon pipe. In addition, a correlation for the Nusselt number of the thermosyphon loop was developed. The dependence of this correlation on Grashof and Prandtl numbers was determined.

Keywords

• Termosifon, Kapalı döngü, Doğal taşınım döngüsü, SIMPLEX algoritması