Carbon nanotubes-ammonia nanofluids(the binary nanofluids) were prepared in aqueous ammonia by two steps method.And the thermal conductivities of nanofluids were measured by the transient hot-wire method.The effects of the mass fraction of carbon nanotubes(CNTs),the concentration of ammonia and temperature on the thermal conductivity of the binary nanofluids were systematically studied.The results show that the addition of CNTs can significantly enhance the thermal conductivity of the base liquid-aqueous am...