| Abstract |
| A method for measuring the surface heat transfer coefficient, h, is presented, which combines a parameter estimation technique with the fast-response capabilities of thin film thermocouples. The developed method was applied to measure the surface heat transfer coefficient of the STS 304L specimens during quenching from pre-selected temperatures, 300 and 400℃, into RT deionized water bath. The surface of specimens were abraded with #200, #800 abrasive papers and polished with 0.3 micrometer alumina powders to investigate the surface roughness effects on h. The measured h values showed the range 10^(4)~10^(5) w/㎡C depending on the surface roughness, which were related to the mechanisms operating during water boiling. |
|
|
| Key Words |
| Surface heat transfer coefficient, Surface roughness, STS 304L, Parameter estimation method |
|
|
 |
|
