METHOD FOR DETERMINING HEAT-TRANSFER COEFFICIENT OF CONVECTIVELY COOLED WALL OF PART Russian patent published in 1997 - IPC

FIELD: metallurgy. SUBSTANCE: method involves dipping part under control into melt of high heat transfer metal at crystallization temperature; blasting part with cooling medium; measuring temperature of cooling medium at part outlet end; withdrawing part from melt and measuring thickness of hardened metal crust; estimating initial parameters. Blasting is performed in two stages, with cooling medium flow rate being the same at both stages. Time τ₁ of one stage is at least equal to time τ_c of cooling medium temperature stabilization process, and time τ₂ of second stage exceeds τ₁. Method further involves determining heat-transfer coefficient K by formula where δ₁, δ₂ is thickness of metal crust formed on part surface upon first and second stages of blasting in crystallized melt, respectively; T_m, T_c is crystallization temperature of melt and cooling medium, respectively. EFFECT: increased efficiency and simplified method.