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(Color online) (a) Steady and controlled hydrogen generation was demonstrated for using about of Mg composed of or plates. After initial ignition by Ohmic heating, reaction was maintained by water input from the top. Solid lines show results for various water supply rates with thick Mg, while dashed line shows results with thick Mg and water supply rate. The linearity shows that the reaction proceeds with constant speed regardless of Mg consumed. (b) High power reaction with Mg of generated of the turbine shown in the top-left corner. The turbine was driven by exhaust gas from the reaction chamber as shown. Note that the specific area (area/volume) of Mg fuel is now twice that of the slow reaction fuel. The peak rotation speed and acceleration depend not only on the shape of Mg but also on the total amount of Mg.
(Color online) (a) Dissociated Mg from laser illumination is blown off by Ar flow and is accumulated onto a Cu plate to avoid reoxidization. Ejected mass rate (given by ejected mass divided by irradiation time) decreases with increasing irradiation time and reaches an asymptotic value. High speed imaging revealed that intense generation of MgO debris took place during first followed by steady vaporization. (b) High speed camera shows the mass ejection of the ringlike structure at the peripheral zone surrounding laser spot for with irradiation on the ceramic MgO. Such mass ejection under evaporation temperature might increase the efficiency of Mg reduction.
Deoxidization experiments with three different laser conditions. The reduction efficiency significantly increases with the aid of gas flow even under atmospheric conditions. means the copper plate was cooled by ice. The resulting improvement from cooling implies the importance of cooling speed. The for the irradiation time means three shots of duration are accumulated onto the plate. The MgO was in the form of ceramic for YAG laser; otherwise most of the powder was blown off due to extremely high pressure induced by the pulsed laser. MgO powder was used for the lasers because the ceramic was broken after a single shot by thermal stress.
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