Axial Heat Transport Mechanism due to Reciprocating Flow in a Ribbed Tube

Experimental and numerical studies were performed to clarify the axial mass and heat transport mechanism of reciprocating flow inside ribbed circular tubes. Water was used for the working fluid. The test section consisted of a circular tube of 16 mm in inside diameter and 800 mm in length. Ribs were installed on the tube wall with a given interval in axial direction and one end of the tube was connected to a heat source and the other end to a heat sink. A crank-piston mechanism was utilized to create reciprocating flow with no net through flow. Numerical simulations were also carried out under the same conditions as the experiment. Since it was confirmed that the results of the simulation agreed very well with those of experiment, the simulation was used to explore the details of the flow and heat transport mechanisms in the present study. The present study disclosed that the periodic formation and extinction of flow separation behind the ribs constituted the axial mass and heat transport through the “trap and release” mechanism in the reciprocating cycles. It was also shown that heat transport performance of the ribbed tube was far superior to that of plain tubes or dream pipes.

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