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Double Pipe Heat Exchanger Lab Report

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EXPERIMENTAL ANALYSIS ON HEAT TRANSFER ENHANCEMENT OF DOUBLE PIPE HEAT EXCHANGER USING NANOFLUID AND BAFFLED TWISTED TAPE INSERTS

Keywords: Heat transfer enhancement; frictional factor; twisted tape inserts; TiO2/water; TiO2+CuO/water; Al2O3/water.

Abstract: The paper deals with the use of baffled twisted tapes, Titanium /water nanofluid, Titanium dioxide+Copper oxide/water nanofluid and Alumina/water nanofluid as compound heat transfer enhancement technique in double pipe heat exchanger. Experiments are conducted inorder to evaluate the friction factor and the heat transfer coefficient for the flow through the heat exchanger. The effect of rectangular baffled twisted tape (RBTT), circular baffled twisted tape (CBTT), Triangular baffled twisted tape (TBTT) and Rectangle with a hole baffled twisted tape were also studied. Experiments are conducted using water and nanofluid of 0.1% volume concentration. The results showed that noticeable enhancement in heat transfer coefficient with use of modified twisted tapes and nanofluids. The heat transfer coefficient was found to be maximum in Rectangle with a hole baffled twisted tape.While comparing water and the nanofluids the heat transfer coefficient was …show more content…

Baffled twisted tapes show higher heat transfer coefficient than twisted tapes without baffles. Rectangle with a hole baffled twisted tape has the maximum heat transfer coefficient value than RBTT, CBTT and TBTT. The generation of secondary flow will disturb the thermal boundary layer and thereby increases the heat transfer coefficient. The enhancement in heat transfer coefficient increases in the order TBTT, CBTT, RBTT and rectangle with a hole baffled twisted

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