Tube entrance heat transfer with deposit formation
Abstract
A two-peak wall temperature profile was observed while flowing a kerosene-type gas turbine fuel through a direct-resistance heated tube at an entrance Reynolds number of about 1500. The downstream peak gradually diminished as deposits formed inside the tube, and only one peak remained after seven hours. The observation is explained qualitatively on the basis of analytical and experimental results reported in the literature. It is shown that the temperature profile can be divided into five regions: development of the thermal boundary layer, appearance of the secondary flows, fully developed thermal boundary layer, transition to turbulent flow, and turbulent flow. Deposits increase the tube roughness and reduce the length required for laminar-turbulent transition.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- June 1982
- Bibcode:
- 1982aiaa.confT....S
- Keywords:
-
- Fuel Flow;
- Heat Transfer;
- Pipe Flow;
- Wall Temperature;
- Boundary Layer Transition;
- Gas Turbine Engines;
- Laminar Flow;
- Temperature Profiles;
- Turbulent Flow;
- Fluid Mechanics and Heat Transfer