Saisorn, Sira

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Saisorn, Sira
Alternative Name
Saisorn, S.
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Email
sira.sa@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 on flow pattern and void fraction for two-phase gas-liquid upflow in a vertical helically coiled micro-channel
    (2025-03-01)
    Saisorn, Sira
    ;
    Benjawun, Phakkhanan
    ;
    Suriyawong, Adirek
    ;
    Wongwises, Somchai
    To contribute toward state-of-the-art microfluidic technology, our experiments were conducted to study gas-liquid adiabatic upflow phenomena in a helical micro-channel having a channel diameter of 0.87 mm, a coil diameter of 50 mm, and a helical pitch of 20 mm. The presence of centrifugal acceleration in the micro-scale flow is given as follows. The unique flow pattern having the throat-like gas-core flow generally detected in the straight micro-tube was still present in the curved test section. The void fraction characteristics were not able to match with the homogeneous flow model. The slip ratio data explicitly showed that the annular flow tended to be highly affected by the secondary flow when compared to the throat-annular flow. The prediction based on different approaches indicated that the data aligned well with drift flux model incorporating inertia and channel orientation effects.
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    Two-phase flow structures in a helically coiled microchannel: An experimental investigation
    (2023-10-01)
    Saisorn, Sira
    ;
    Benjawun, Phakkhanan
    ;
    Suriyawong, Adirek
    ;
    Asirvatham, Lazarus Godson
    ;
    Mondal, Pranab Kumar
    At the microfluidic scale, the utilization of helically coiled channels (HCCs), also known as a spiral channel, for two-phase flow offers numerous advantages in various applications. Existing articles mainly focus on the macro-scale transport, examining secondary flows induced in curved channels. The increasing demand, however, for innovative miniature equipment for thermal energy management emphasizes the importance of comprehending gas-liquid micro-scale flow in curved channels. Unfortunately, despite a vast body of literature on this paradigm, there is still a lack of systematic investigations into the underlying facets of two-phase micro-scale transport in HCCs. To address this gap, our study conducted experiments on adiabatic two-phase air-water flow inside an up-flow helical micro-scale tube. The tube had a hydraulic diameter of 0.87 mm, a coil diameter of 50 mm, and a helical pitch of 20 mm. The primary aim was to explore the impact of centrifugal force on flow pattern, void fraction, and frictional pressure drop characteristics. Additionally, we carefully examined the phase separation phenomenon influenced by the secondary flows induced by the curved channel. In particular, we compared the gas-core flow pattern (either throat-annular flow or annular flow), void fraction, and frictional pressure drop obtained from our experiments on the helical tube with corresponding results based on straight micro-scale channel configurations for an Eötvös number of approximately 0.01. In summary, this study delves deep into the crucial aspects of two-phase micro-scale transport in HCCs, contributing to a better understanding of these systems for future advancements in micro-channel applications.