Suchatawat, Maturose

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Suchatawat, Maturose
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maturose.su@kmitl.ac.th

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    Item type:Publication,
    Effects of the laser process parameters on kerf quality
    (2018-03-01)
    Kongcharoen, Teeraphat
    ;
    Suchatawat, Maturose
    This paper presents an experimental study on the effects of the process parameters on laser cutting of 3 mm thick mild steel plates. The parameters investigated includes laser power, gas pressure and cutting speed. The kerf width and the cut edge roughness are examined. The laser source used is a continuous wave CO<inf>2</inf> laser with maximum power of 4 kW. The obtained results show that as the laser power increases, the average kerf width increases. Oxygen gas pressure also has a remarkable effect on the cut edge roughness. It is found that as the gas pressure increases, the roughness is increased. Increasing of the cutting speed gives the narrower average kerf width and the smoother cut surface.
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    Flow pattern, heat transfer and pressure drop behaviors of micro-channel flow boiling
    (2018-01-01)
    Saisorn, Sira
    ;
    Srithumkhant, Pochai
    ;
    Wongpromma, Pakorn
    ;
    Suchatawat, Maturose
    ;
    Wongwises, Somchai
    Two-phase flow of R-134a with high confinement number was experimentally carried out in this study. Flow boiling conditions for different orientations were controlled to take place in a stainless steel tube having a diameter of 0.5 mm. Based on a saturation pressure of 8 bar, a heat flux range of 2-26 kW/m<sup>2</sup>, and a mass flux range of 610-815 kg/m<sup>2</sup>s, a constant surface heat flux condition was controlled by applied DC power supply on the test section. The flow behaviors were described based on flow pattern and pressure drop data while heat transfer mechanisms were explained by using heat transfer coefficient data. In this work, nucleate boiling was observed, and the importance of the change in the flow direction was neglected, corresponding to the confinement number of around 1.7.