A computational method for integrating fluid-dynamic simulations and heat-transfer calculations in different segments of solid boundaries has been developed to predict deposition inside tubes. The fuel thermal-degradation mechanism is treated mathematically using a four-step global-chemistry model. Deposits are allowed to grow on the wall surface, and the resulting fluid-dynamic and heat-transfer changes are implicitly computed using a time-dependent formulation. Turbulent-flow simulations for the fuel flow bounded by the fuel-deposit interface are made on a body-oriented coordinate system. The induction period, which is associated with the slower deposition during the initial hours of exposure, is modeled by introducing a wall-reaction-type mechanism for the surface sticking phenomenon. Calculations are made for full-scale and half-scale gas-turbine injector feedarm rigs. The temperature at the deposit-tube interface is found to increase with deposition. Computed accumulated deposit weight and changes in the tube-inner-wall temperature with time are compared with the experimental data. The effects of fouling on heat transfer and blockage to the fuel flow are discussed.
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Katta et al. (1993) studied this question.
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