Mixed convective heat transfer of water flowing in pipe under supercritical pressure

Because of the rapid variation of fluid properties across the critical point under supercritical pressure, there is strong secondary flow in heated pipe, which will certainly complex the problem of heat transfer of fluid in pipe. In this paper, a numerical study is conducted for the laminar developing mixed convective heat transfer of water flowing in pipe under supercritical pressure. The velocity field and temperature field are given, the influence of different parameters on flow and heat transfer is investigated in detail. The results show that secondary flow has a great influence on velocity and temperature distributions and thus can also remarkably affect the friction factor and the Nusselt number.