A question regarding power generation in MHD method

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In the discussion on MHD power generation, the focus is on the impact of using a metal tube for an ionized flow compared to open flow. The key question is whether the confinement of the flow within a metal tube affects the power output generated. Factors such as the interaction between the ionized flow and the tube's material, as well as potential changes in magnetic fields, are considered. The consensus leans towards the idea that the tube could influence the efficiency and output due to these interactions. Ultimately, the scenario suggests that the environment and containment method can significantly affect MHD power generation outcomes.
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If ionized flow is used to generate power/electricity by MHD method, will there be in any difference in power output if the flow is confined inside a tube made of metal instead of a free flow.
First, I want to put forward an imaginary scenario where an ionized flow is being used to generate power/electricity by MHD power generation method. The temperature of the ionized flow is the same as the surrounding atmosphere. Power/electricity is generated as the flow is ionized. Now, if the flow passes through a tube made up of metal instead of flowing in open, I want to know whether there will be any difference in power output in such a case or it will be the same?
 

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