Flow resistance and heat transfer characteristics in micro-cylinders-group

De-ionized water flows through in-line and staggered arrays micro-cylinders-group plates with different distances among micro-cylinders, and the resistance characteristic and the Nusselt numbers of micro plates are experimentally obtained. The investigations show that the distances among cylinders (S values) have slight influence on flow resistance and the experimental Nusselt number and they are far less than predictions of classical correlations at extremely low Reynolds number due to the appearance of the sluggish regions in micro cylinders-group plate. With the increase of Reynolds number, the influence of the S values on flow resistance becomes more apparent and the flow resistance and the experimental Nusselt number of micro-cylinders-group rapidly increases due to the decrease of sluggish regions in the micro-cylinders-group plate and the weakness of the variation of the thermophysical properties with temperature and the endwall effects.