Pressure drop measurements in a low pressure steam condenser with a horizontal bundle of staggered tubes

Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D=1.33. The test conditions were: steam inlet pressure, 50 mbar, inlet velocity 10–30 m s−1 and steam-to-cooling water temperature difference 5–15 K. This corresponded to a mean bundle Rev,max between 1000 and 7000, suction parameter range 0.3–2.8 and heat flux densities at the tube outside wall up to 79 kW m−2. In the range 2800