On the mechanism of particle deposition through boundary layers in heat exchange systems
Abstract
A theory is developed that will enable the prediction of particle deposition through laminar and turbulent boundary layers under the influence of thermal and concentration gradients. Various mechanisms are described, and the simultaneous occurrence of different mechanisms is examined. The effect of changing heat flux to the deposition surface is investigated, and a pseudovelocity term is developed which serves to increase or decrease the heat flux to the wall depending on the species present. Special emphasis is placed on the fouling and deposition associated with exchange systems exposed to high, moderate, and low temperatures. The various mechanisms associated with fouling and deposition are discussed, and areas for future research are identified. A suggestion is made for examining the deposition of particulates on transfer surfaces with regard to their diffusion rates at low temperatures and high concentration gradients in order to provide better predictive capability.
- Publication:
-
24th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1986
- Bibcode:
- 1986aiaa.meetY....G
- Keywords:
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- Deposition;
- Heat Exchangers;
- Hydrocarbon Combustion;
- Laminar Boundary Layer;
- Particle Size Distribution;
- Turbulent Boundary Layer;
- Computational Fluid Dynamics;
- Heat Flux;
- Temperature Gradients;
- Fluid Mechanics and Heat Transfer