Historical perspective of seawater MHD relative to classical MHD in terms of: basic equations & dimensionless parameters, MHD interaction parameters & load factor map; seawater chemistry & bubble physics; propulsion vs drag reduction is presented. Seawater vehicle drag reduction evolution from shaping, laminar flow to turbulent drag reduction to EMTC is summarized. Microturbulence & drag reduction is expressed in terms of microturbulence scales versus flow speed; phenomenological structural models and effects of drag reduction on microturbulence events.
An EMTC concept is described in terms of streak spacing length & frequency experimental data vs. speed for flat plate geometry; MHD interaction parameter & load factor vs. speeds; microturbulence dynamics & Lorentz pressure gradient power & EMTC efficiency. This leads to a design map from scaling analysis & comparison with available experimental data. Prospect of EMTC based on active feedback control to suppress the microturbulence events is described in terms of pattern consistent with microturbulence events; timing consistent with microtur-bulence events; engineering schematics with magnets & magnetless configurations and sensor locations & detection methodologies. A semi-Markov Prediction Model is described in terms of sample calculations and parametric analysis to obtain Poisson arrival rates.
The theme is that we have come a longway to attract so much attention & look forward to meeting many years of challenges to advance in this new & exciting frontier.