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Boiling heat transfer characteristics of nitrogen were experimentally investigated in a stainless steel plain tube and wire coil inserted tubes. Wire coils having different coil pitches and wire thicknesses were inserted into a horizontally positioned plain tube, which had an inner diameter of 10.6mm and a length of 1.65m. The coil pitches were 18.4, 27.6, and 36.8mm, and the wire thicknesses were...