The effect of inserting coil wire in the shell side of a double
pipe heat exchanger on the heat transfer and pressure drop are
experimentally investigated. The experiments are performed
using water as the hot and cold working fluid under the turbulent
flow condition. Nine coils with different wire diameter (dw = 2, 4
and 6 mm) and different coil pitch ratio (P/ dw = 2.5, 5 and 7.5)
are used in the study. Results presented an increasing up to 1.59
in the heat transfer coefficient while the pressure drop increased
10 times compared with the smooth pipe. Results also showed
that the increase in the heat gain is very big than the loss in the
pumping power.