Pressure Loss on Corrugated Annulus of Double Pipe Heat Exchanger

Abstract

Fluid flow performances were performed as preliminary research on double pipe heat exchanger with longitudinally corrugated. In this experiment, the annulus tube is geometrically design and form of alternating groove. This experiment using longitudinal grooved pipe as inner tube of double pipe heat exchanger. The objective of this investigation is to determine the pressure loss along the pipe as a time series function. The fluid mechanics analysis of in this paper also provide pressure drop of system and presenting pressure signal. The longitudinal grooves were incised on outer surface of tube side with number of longitudinal grooves of 2. 0.3 mm high and 1 mm width grooves were kept constant. The tube made of aluminium with outer diameter is 20 mm. The shell is made of acrylic which has 26 mm in internal diameter. The hot fluid flows in tube space and the cold fluid flows in the annulus space of double pipe heat exchanger. Counter flow scheme use in this experiment with water as working fluid. The volume flowrate of cold fluid was varied from 11 lpm up to 15 lpm which is equal to Reynold Number (Re) range around 31981 up to 43610. The other hand, the volume flowrate of hot fluid remains constant at 15 lpm which is equal to (Re) around 30904. Pressure data was recorded using differential pressure tranducers and digitalize using data logger. The corresponding comparison of the pressure drops revealed the corrugated double-pipe heat exchangers had 5.2 % larger pressure drop. The grooved-double pipe heat exchanger has more disadvantage on fluid performance since the thin corrugated area are slightly increased which essentially correlation on larger pressure drop.