Internally Enhanced Carbon Steel Tubes for Ammonia Chillers
Internally Enhanced Carbon Steel Tubes for Ammonia Chillers (1998)-Heat transfer and pressure-drop data were obtained with two different tube geometries in the turbulent, transition, and laminar flow regimes. The experiment with one tube was conducted at Rensselaer Polytechnic Institute (RPI) and with the other at Ohio State University (OSU). Above Re = 10,000, the enhancement levels are essentially constant at 2.5 and 3.0 and are a function mainly of the tube geometry. The friction-factor increase is about the same as the thermal enhancement level for both tubes for Re < 10,000 but it continues to increase with increasing Re. For Re < 10,000, the enhancement levels increase even further, reaching a value of 5.9 at Re = 2,000 for the tube tested at RPI. The reason for this significant enhancement in the Re range of 2,000 to 5,000 is the earlier transition to turbulent flow with enhanced tubes. For Re values in the 2,000 to 7,000 range, the friction-factor is significantly less than the heat transfer enhancement.
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