| 摘要 |
The fluid passes through the uniform central bore of a conduit (17), whose wall thickness increases uniformly, axially (19,20). An electrical energy source (18) is connected between the ends. Resistive heating per unit length diminishes as the thickness increases, the required energy distribution being obtained by choosing suitable dimensions. Opt., the bore diameter may also vary, or the thickness may increase in steps, not uniformly. Variation may opt. be obtained, e.g. by doping semi-conducting wall material, in the resistance per unit length. Opt., also, the electric current may be applied between the two ends, in parallel, and a variable intermediate point, or several such circuits, between successive connection points, may each have an independently variable energy source.
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