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The design of a polymer electrolyte fuel cell (PEFC) stack requires careful consideration of thermal, water, and gas management to ensure high stack performance in operation. This work aims to develop a mathematical and numerical model for PEFC stacks that serves two objectives: the first involves a study of the fundamental aspects of the PEFC and the associated transport phenomena, electrochemical processes and multiphase flow for a single cell as well as a stack. The second objective concerns the development and integration of applied research for the PEFC single cell and stack, including...

Spray drying produces engineered powders in one step from liquid feeds with applications across numerous industries. One major problem in spray drying is potential deposition of particles on the internal wall of the spray chamber. Such a problem can be severe if the operating parameters for a particular new feed is not known or if modifications are to be made in existing operations. The first part of this book introduces a rapid systematic approach to optimize the operation of a spray dryer. A new concept is introduced to reduce deposition via dryer wall surface energy...