Abstract
In this work, a method to increase the residence time of bubbles in tubes or pipes filled with liquid metal is investigated. Imposing a horizontal electric current and a perpendicular horizontal magnetic field generates an upward-directed Lorentz force. This force can counteract gravity and cause floating of bubbles. Even with homogeneous electric fields these float in the mean but fluctuate randomly within the swarm due to mutual interactions. In the present case the cylindrical shape of the container furthermore creates inhomogeneous electric currents and an inhomogeneous force distribution resulting in a macroscopic convection pattern stirring the bubbles and further homogenising the spatial distribution of the bubbles.
Highlights
An innovative technique for the production of hydrogen is the direct thermal cracking of methane into carbon and hydrogen
Static channel First, computations in matlab R were conducted to determine the current density alone in the channel filled with stagnant material of constant conductivity, to understand the Lorentz force distribution in the present setup with curved electrodes
At the apex of the electrode, the x-component equals the normal value, which is set by the boundary condition
Summary
An innovative technique for the production of hydrogen is the direct thermal cracking of methane into carbon and hydrogen. This can be achieved by introducing methane bubbles into tubes filled with liquid tin which serves as a heat transfer medium. Pose technical problems such as difficulties of handling the process and devising suitable materials for the construction of the apparatus. Another strategy is to work with somewhat lower temperatures but to increase the residence time of the bubbles by an appropriate amount to accommodate the slower reaction. This density difference is a major advantage of the process, as it facilitates the separation of the solid
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