Bunwut is investigated in tubes under nonuniform heating on the perimeter. Data on heat trrmsfer and crilical heat flux ('IchtJ in the case of water were obWilled for ranges of mass ve/Dcily pw -200-3000 kglm 2 s, pressure p -0.1-1 MPa, and inlet water temperature T -2S-9SoC. The test section was a horivmtal copper tube of 21 mm outer diameter, S mm inner diameter with a technwally smooth surface and heat transfer-intensifying twisted tape and porous sintered coating. The test section was hented by bombardment with electrons. It is es/abUshed that a redistribution of heat fluxes and an increase of wall temperature fluctuations occur at burnout. The range of regime parameters to prevent burnout of a heat transfer surface is detennined.

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