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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    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.
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    Experimental investigation of the secondary flow influencing on two-phase heat transfer and pressure drop characteristics in curved micro-tube
    (2026-05-15)
    Khauntakob, Suphattharachai
    ;
    Chingulpitak, Sakkarin
    ;
    Wongwises, Somchai
    ;
    Saisorn, Sira
    This study investigates the flow behavior, heat transfer, and pressure drop in a helically coiled microchannel exposed to a range of heat flux levels. The analysis focuses on the effects of secondary flow and two-phase (phase-change) flow of R134a refrigerant under vertically upward conditions. The experiment involved fabricating a helically coiled channel with a 1 mm inner diameter. Experiments were conducted with a mass flux of 636 kg/m²·s, a saturation pressure of 0.9 MPa, and heat fluxes ranging from 0.1 to 10 kW/m². The experimental results demonstrated that the helical tubes enhance heat transfer through secondary flows and Dean vortices, which increase turbulence and disrupt the thermal boundary layer.
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    Experimental study of adiabatic two-phase micro-scale up-flow in helical tube
    (2026-05-15)
    Chorprasert, Vissuta
    ;
    Chingulpitak, Sakkarin
    ;
    Wongwises, Somchai
    ;
    Saisorn, Sira
    This research investigates the flow characteristics in a helical coil tube with a length of 850 millimeters, a coil diameter of 50 millimeters and an inner diameter of 1 millimeter, focusing on the adiabatic two-phase flow of water and air in a vertically upward direction. The test runs are done at a superficial velocity of gas and liquid varies between 0.86 to 12.86 m/s and 0.01 to 0.19 m/s, sequentially. Three flow patterns were observed: Annular flow, Throat-annular flow and Slug flow. A flow regime map was created and compared with data from other researchers. Additionally, the study examined the pressure drop in the two-phase flow within the micro-scale helical coil tube, finding that the pressure drop is low and gradually rises as the superficial gas velocity.