CFD study of geometrical parameters effect on heat transfer coefficient during flow boiling in helically coiled tube

Numerical study of subcooled and saturated flow boiling in the curved and helically coiled tubes is one of the challenging area of computational fluid dynamics (CFD) studies. In this paper, the CFD modeling of bubbly flow boiling in the small helically coiled tube at low vapor quality region are studied. A proper Eulerianbased mathematical model is used for interphase exchange forces and heat transfer between two phases in CFD modeling using bulk boiling model. The results show that, the inner and the bottom wall of the helically coiled tube have the lowest and the highest heat transfer coefficient, respectively. It has been observed that at low vapor quality flows, the heat transfer coefficient is enhanced by decreasing in coil diameter, tube diameter and increasing of coil pitch of helically coiled tube.

کلیدواژه ها:

CFD simulation ، flow boiling ، helically coiled tube ، boiling heat transfer coefficient