Numerical Study of Heat Transfer Characteristics in Narrow Channel with Staggered Dimples

In this paper, numerical simulations were conducted to investigate the flow and heat transfer characteristics of dimple channels. To contrast with the channel with dimples, a numerical study on a smooth plate channel was also made. The results show that in dimple channel, flow separation occurred near dimple windward edge, low heat transfer rate was observed in these regions and dimple wake region owned high heat transfer rate. The calculation results show that the mean Nusselt numbers of dimple channel were 27.58 and the amplification is 15.2%. The friction factor of dimple channel is 0.018 and decrease by 5.26%, the thermal performance parameter TP is 1.18. It can be seen that the heat transfer in the channel is enhanced markedly with the staggered dimples.