maximum sorbent utilization efficiency.These pilot test results indicate that S02 capture by entrained hydrated lime particles occurs by two different mechanisms: a gas/solid reaction mechanism for particles which do not interact with droplets; a gas/solid/droplet reaction mechanism for particles interacting with water droplets.Accordingly, the sorbent injection process performance may be improved by enhancing either of these two reaction mechanisms. The lime properties may be improved to enhance the sorbent's intrinsic activity for the gas/solid reaction mechanism. The humidifier may be designed to provide increased particle-droplet interactions to promote

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of Paper Proposedfor the 32nd AIAA Thermophysics Conference

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This paper describes a parallel implementation of the direct simulation Monte Carlo (DSMC) method. Runtime library support is used for scheduling and execution of communication between nodes, and domain decomposition is performed dynamically to maintain a good load balance. Performance tests are conducted using the code to evaluate various remapping and remapping-interval policies, and it is shown that a onedimensional chain-partitioning method works best for the problems considered. The parallel code is then used to simulate the Mach 20 nitrogen flow over a finitethickness flat plate. It is shown that the parallel algorithm produces results which compare well with experimental data. Moreover, it yields significantly faster execution times than the scalar code, as well as very good load-balance characteristics.