Effects of pulsation on flow and heat transfer characteristics are experimentally examined in the pulsating pipe flows having sinusoidal velocity fluctuations around a nonzero mean. By systematically varying three pulsation parameters (the amplitude, frequency, and mean velocity), time-averaged and fluctuating temperature profiles are measured under the heating condition of constant wall temperature using saturated vapor. The mean Nusselt number is calculated, and compared with that in ordinary turbulent pipe flows without pulsation. The results show that it decreases initially as the pulsation amplitude increases, then recovers gradually, and finally become much greater than the original value.