Experimental study on friction and heat transfer characteristics of pulsating flow in rectangular channel under rolling motion

• Experiments were performed in rectangular channel.
• Effect of flow pulsation on cycle-averaged friction and heat transfer characteristics are experimentally studied.
• Relationships between the pulsation amplitude of Reynolds number, friction factor and Nusselt number are studied.
• Instantaneous friction and heat transfer coefficients of pulsating flow are obtained.

Friction and heat transfer characteristics of pulsating flow induced by rolling motion are experimentally studied. A series of single-phase forced circulation flow experiments are conducted in a vertical narrow channel. In the present study the flow rate is adjusted through control the impeller rotator speed of the pump. The results show that the flow rate pulsation simultaneously with the rolling motion and the relative amplitude of the flow rate pulsation decreases with the increasing flow rate. Accordingly, the relationships between the relative pulsation amplitude of friction factor, heat transfer coefficient and flow rate are classified. Therefore, the correlations have been developed to calculate the friction and heat transfer coefficient based on the relative pulsation amplitude of the flow rate.