Chingulpitak, Sakkarin

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Chingulpitak, Sakkarin
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Email
sakkarin.ch@kmitl.ac.th

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    Item type:Publication,
    Characterization of diabatic air-water flow in helically coiled micro-channel
    (2026-05-15)
    Benjawun, Phakkhanan
    ;
    Chingulpitak, Sakkarin
    ;
    Pratuyai, Kritsada
    ;
    Wongwises, Somchai
    ;
    Saisorn, Sira
    Experimental studies on flow patterns and heat transfer (HT) phenomena in a two-phase air-water system within a vertically helically coiled micro-scale tube were conducted using an SS-304 tube with a 1 mm diameter, a coil diameter of 50 mm, and a uniform coil pitch of 20 mm. The study investigated heat transfer characteristics under constant heat flux conditions. The superficial gas and liquid Reynolds numbers ranged from 290 to 3800 and 780 to 1170, respectively. The results indicated that throat-annular flow exhibited superior heat transfer performance compared to bubble flow, slug flow, churn flow, and annular flow. Finally, the observed flow regimes from the experiment were analyzed and compared with existing prediction methods.
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    Item type:Publication,
    Experimental investigation of non-boiling gas-liquid two-phase flow in helically coiled micro-channel
    (2026-05-15)
    Benjawun, Phakkhanan
    ;
    Chingulpitak, Sakkarin
    ;
    Pratuyai, Kritsada
    ;
    Wongwises, Somchai
    ;
    Saisorn, Sira
    The pressure drop (dP) and flow pattern are presented for two-phase flow in a helical micro-scale channel using an SS-304 tube of 1 mm diameter, having an equal coil pitch of 20 mm, and a coil pitch of 20 mm, all under constant surface heat flux situations. A flow visualization study was conducted, revealing various flow patterns, including bubbly flow, slug flow, churn flow, throat-annular flow, and annular flow. Additionally, the results demonstrated a higher pressure drop (dP) during churn flow in the channel.