Numerical study on performances of small incline angle helical baffle electric heaters with axial separation

•Axial separation with small incline angle baffles reduces abrasion of holes on tubes.•Axial separation scheme has plug flow velocity field similar to normal helical one.•Flow and thermal performances of axial separation and normal schemes were simulated.•Average h.t.c. or h·Δp−1/3 of HM20(10)° is 3...

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