Enhancement of steam condensation on titanium corrugated tubes under vacuum condition

摘要

Steam condensation tests were conducted on titanium corrugated tubes at the pressure of 5 kPa and 10 kPa, which are the operating pressures of a power plant condenser. Seven 22.2 mm O.D titanium corrugated tubes had 6.4 mm <= p <= 22.1 mm and 0.2 mm <= e <= 0.6 mm. The condensation heat transfer coefficient increased as the corrugation pitch or the corrugation depth decreased. The tube having p = 6.4 mm and e = 0.2 mm yielded the highest heat transfer coefficient with the enhancement from 57 % to 75 %. Comparison with Mehta and Raja Rao [17] correlation revealed that the data are predicted within +/- 15 %.