Study on Approximate Analysis of Convective Heat Transfer during Line-Heating Process

The aim of this study is analytically to clarify heat transfer between combustion flame and the steel plate, that is to obtain heat flux, during line-heating process with both experiment and analysis.Two dimensional temperature distribution within combustion flame is measured by laser induced fluorescence technique. For simplicity, jet instead of combustion flame is used to calculated temperature and velocity distributions. Using standard k-e two equations model and assuming logarithmic law as wall function, convective heat transfer for turbulent flow is analyzed.When the highest temperature within flame is used as temperature of jet at the nozzle exit, calculated temperature distribution of gas flow in near-wall region is similar to measured one. Measured and calculated time histories of temperature in the steel plate are in close agreement with each other. Numerical method to obtain heat flux is proposed during line-heating.