20.500.12556/RUL-105932 High-speed camera thermometry of laser droplet generation This paper presents a high-speed thermal imaging method using a visible light camera, with application to the laser droplet generation process (LDG). In the experiment, a nickel wire-end was exposed to a collimated laser beam, and the subsequent process of wire melting, pendant droplet formation and its detachment were recorded by a high speed camera. Instantaneous temperature fields of the metal surface were calculated from the imaging data and were characterized by a very good spatial and temporal resolution (200 x 400 pixels at 13,837 frames per second). The droplet temperature could be accurately calculated between the melting point of nickel (1455 °C) and approximately 1950 °C, where image saturation started to occur. The remaining pendant droplet was shown to cool much more rapidly than the detached droplet, which is due to the heat conduction to the solid wire. Except for the time immediately after the droplet separation, the temperature distribution across the melt droplets was found to be quite uniform. Apart from the possibility of temperature field calculation, it was also demonstrated that the high-speed images of the LDG process can accurately capture contours and oscillation dynamics of melt droplets. laser droplet generation temperature measurement high-speed camera melting droplet detachment fluid dynamics laserska tvorba kapljic merjenje temperature hitre kamere taljenje kapljic ločevanje kapljic dinamika tekočin true false true Angleški jezik Slovenski jezik Članek v reviji 2018-12-24 12:12:47 2018-12-24 12:12:49 2025-02-24 13:00:14 0000-00-00 00:00:00 2017 0 0 Str. 298-305 Vol. 110 Jan. 2017 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2018-08-29 536.52:681.783.332(045) 1359-4311 10.1016/j.applthermaleng.2016.08.182 14815515 1861910 RAZ_Bizjan_Benjamin_i2017.pdf RAZ_Bizjan_Benjamin_i2017.pdf 1 F3E11F524B2D23587DC4266D065B0A1C 09420de5612160ae72a0d3c1d87f61da73249b70797491a7911c4a64d525b2fb 3efd4028-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=116649 http://www.sciencedirect.com/science/article/pii/S1359431116315411 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=116628 Fakulteta za strojništvo 0 0 0