Abstract
This study deals with the pressure drop along heat exchanger tube. Pressure drop between two gas reservoirs, a cylinder and a tank, was measured for frequencies 20-40Hz and different gases-air helium and argon, and at various pressure, 60-400kPa. The measured pressure waveform was discussed by separating it into the sine (corresponding to flow loss) component and the cosine (related to flow acceleration) component. The cosine component was several times as large as the sine component. The sine component is roughly correlated with the coefficient of resistance derived in steady flow. The cosine component is indicated to be proportional to the pressure difference to accelerate the fluid mass in the tube with a factor of about 3.
