Establishment of a Physical Simulation Platform for Controlled Cooling of Steel Tubes and Determination of Heat Transfer Boundary Conditions

doi:10.3901/JME.2018.24.069

Abstract

Abstract: At present, heat transfer boundary conditions, the key issues in researches on controlled cooling of steel tubes, have not been specifically analyzed. Therefore, a full size physical simulation platform for controlled cooling of steel tubes is set up based on the actual situation of thermo mechanical control process (TMCP). The cooling curves of 28CrMoVNiRE oil well tubes are measured, the heat fluxes and the heat transfer coefficients are calculated by inverse heat conduction method and the heat transfer boundary conditions are analyzed under three different air mist spray controlled cooling conditions, which are 1) water flow of 11.4 L/min, air pressure of 0.2 MPa, 2) water flow of 11.4 L/min, air pressure of 0.3 MPa and 3) water flow of 18.0 L/min and air pressure of 0.3 MPa. The results show that the key factor affecting the heat transfer of steel tubes in air mist spray controlled cooling is the mixture ratio of air and water, and its optimal value is between 6 and 7. With the decrease of temperature difference(ΔT), the heat transfer coefficients go through three different stages in turn, namely the slow increasing stage at higher temperatures, the stable stage at middle temperatures and the rapid increasing stage at lower temperatures. The reliability of inverse heat conduction calculated results is verified by the finite element method. The feasibility of air mist spray controlled cooling physical simulation technology is validated by the fine microstructures of steel tubes after controlled cooling. Determination of heat transfer boundary conditions has important guiding significance for realizing the online air mist spray controlled cooling process of steel tubes.

Key words: air mist spray cooling, interfacial heat transfer, inverse heat conduction method, seamless steel tubes, thermo mechanical control process

CLC Number:

TG162

WANG Xiaodong, GUO Feng, WANG Baofeng, BAO Xirong. Establishment of a Physical Simulation Platform for Controlled Cooling of Steel Tubes and Determination of Heat Transfer Boundary Conditions[J]. Journal of Mechanical Engineering, 2018, 54(24): 69-76.

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