Boiling heat transfer of upwind planar water jet impingement on moving hot steel sheet

This study aimed to experimentally investigate the boiling heat transfer characteristics of an upward planar water jet on a horizontally moving stainless-steel sheet with 0.3-mm thickness using an infrared camera-based method. The experiments varied the moving velocity of the solid (1.5, 3.0, and 4.4 m/s), the initial temperature (200-600 degrees C), and the jet impact velocity (1.08 and 1.32 m/s). The surface heat flux distribution and temperature profile of the solid were found to be asymmetric to the jet impingement line. The temperature drop due to jet impingement Delta T-m can be expressed as integral q(s)(x)dx/(rho cHV(s)), where rho, c, H are the density, specific heat, and thickness of the test sheet, respectively. This quantity depends both the heat flux profile q(s)(x) and the moving velocity V-s. The solid exhibited large temperature decreases at small moving velocities. The curve of the maximum heat flux, defined as the peak value in each experiment, exhibited similarities to a pool boiling curve and was significantly dependent on the local temperature of the solid. The empirical correlations for predicting the maximum heat flux in the nucleate and film boiling regions were constructed as q(max) = 50100V(S)(-0.169) v(j)(0.377) Delta T-sat(1.48) W/m(2) and q(max) = 34500V(S)(0.014) v(j)(0.5) Delta T-sat W/m(2), respectively, where v(j), and Delta T-sat are the jet impact velocity and wall superheat.