EXPERIMENTAL STUDY OF THE EFFECT OF THE HELICAL RIBS IN A SPIRALLY COILED TUBE ON THE FRICTION REACTOR AND THE NUSSELT NUMBER OF A NANOFLUID FLOW IN IT

The effect of the centrifugal force arising in a spirally coiled tube with helical ribs on the heat transfer in the fl uid fl ow in it was investigated. It is shown that, due to this force, the rate of heat transfer in the fl uid fl ow in a spirally coiled tube with helical ribs is larger than that in an analogous tube with no ribs. It was established that, in the case where nanoparticles are added to the base fl uid fl owing in a spirally coiled tube with helical ribs, its transport properties change, with the result that the Nusselt number of the fl uid fl ow increases. Moreover, an increase in the nanofl uid concentration leads to an increase in the rate of heat transfer in the fl uid fl ow in the tube depending on the direction of its helical ribs, and the friction factor of the fl uid fl ow in the tube insignifi cantly increases in this case.
The effect of the centrifugal force arising in a spirally coiled tube with helical ribs on the heat transfer in the fl uid fl ow in it was investigated. It is shown that, due to this force, the rate of heat transfer in the fl uid fl ow in a spirally coiled tube with helical ribs is larger than that in an analogous tube with no ribs. It was established that, in the case where nanoparticles are added to the base fl uid fl owing in a spirally coiled tube with helical ribs, its transport properties change, with the result that the Nusselt number of the fl uid fl ow increases. Moreover, an increase in the nanofl uid concentration leads to an increase in the rate of heat transfer in the fl uid fl ow in the tube depending on the direction of its helical ribs, and the friction factor of the fl uid fl ow in the tube insignifi cantly increases in this case.
Author:  P. Naphon, S. Wiriyasart, A. Srichat
Keywords:  nanofl uid, spirally coiled tube, helical rib
Page:  614 -621