Conjugate numerical model for cooling a fluid flowing through a spiral coil immersed in a chilled water container

A conjugate numerical model has been proposed to investigate the problem of cooling a fluid flowing through a spiral coil immersed in a chilled wafer container which is common in many beverage dispensers, ii simple axisymmetr ic numerical procedure is described to determine the temperature of the flu id in the spiral coil and that of the coil surface. A one-dimensional heat balance equation for the fluid within the coil is utilized to update the fl uid and wall surface temperatures, which are needed to calculate the temper ature field in the water container with solid ice walls. The SIMPLE algorit hm has been adopted along with the standard k-epsilon turbulence model equa tions. A reasonably good agreement between the numerical predictions and ex perimental results has been achieved.