Improved heat-transfer systems for evaporators. Performance characteristics of advanced evaporator tubes for long-tube vertical evaporators

Technical Report · Fri Jan 01 04:00:00 EST 1971

OSTI ID:7319781

Alexander, L G; Hoffman, H W

Smooth tubes used in conventional vertical tube evaporators have overall heat-transfer coefficients of the order of 500 to 600 Btu/hr . ft/sup 2/ . /sup 0/F. In contrast, tubes with surfaces modified in various ways to promote condensation and/or evaporation exhibit overall coefficients up to seven times larger than those of smooth tubes. This report details investigations undertaken to compare the effectiveness of enhanced tubes for VTE service. Results for a wide variety of modified tubes are given with emphasis on the performance of doubly fluted, spirally corrugated, and porous-surfaced tubes as most promising types. In addition, means for achieving increased heat transfer through modification of surface and/or flow are considered; limited experiments elucidating the enhancement mechanisms are also described.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7319781
• Report Number(s): ORNL-TM-2951
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
420400 -- Engineering-- Heat Transfer & Fluid Flow
COMPARATIVE EVALUATIONS
DATA ACQUISITION
DESALINATION PLANTS
ENERGY TRANSFER
EVAPORATORS
HEAT TRANSFER
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
OXYGEN COMPOUNDS
PERFORMANCE
SEAWATER
TUBES
WATER