The hydrodynamic and heat transfer characteristics of the fully-developed gas-liquid Taylor flow in a 0.5 mm capillary were studied numerically using the moving frame method. The bubble shapes

pressure drops and heat transfer characteristics were analyzed. The numerical results show that the liquid film thickness

the bubble length and the length of the unsteady region near the bubble tail increase with increasing Re. The effect of void fraction ξg on the bubble shapes is insignificant

while a longer bubble is expected at a higher ξg. The frictional factor f which is higher than the single-phase flow decreases with increasing Re and ξg. The average Nusselt number increases with increasing Re

while the increasing trend decreases with increasing Re. Nutp decreases linearly with increases in ξg and Nutp is about 1.2 to 3 times of that for the single-phase flow which means that Taylor flow can enhance heat transfer.