Saisorn, Sira

Preferred name

Saisorn, Sira

Alternative Name

Saisorn, S.

Main Affiliation

KMITL Prince of Chumphon Campus

sira.sa@kmitl.ac.th

Now showing 1 - 10 of 26

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Pool boiling heat transfer enhancement of distilled water with passive rotating blades installed above the heating surface
(2017-01-01)
Suriyawong, Adirek
;
Saisorn, Sira
;
Wongwises, Somchai
This study examined the pool boiling heat transfer of distilled water on a copper heating surface with passive rotating blades installed above the heating surface. The rotating blades were made from copper material, with a diameter of 30 mm, a core of 5 mm, a length of 50 mm, and a blade angle of 90°. The number of blades in this experiment varied between 2, 3, and 4. The study examined the effects of a varying number of blades and the distance between the heating surface and rotating blades (L<inf>SB</inf>) on the pool boiling heat transfer coefficient. The experimental results show that, when compared under the same conditions, the rotor with four blades yielded a higher heat transfer coefficient than those with two and three blades. This is because the added blades increased the area that received strike force from the bubbles. As a result, the rotating blades created more disturbance of the working fluid over the heating surface. Furthermore, when compared with the same number of blades, the L<inf>SB</inf> of 5 mm yielded a higher heat transfer coefficient than the L<inf>SB</inf> of 15 or 25 mm. This is because the increased L<inf>SB</inf> provided less chance for the bubbles to strike the rotating blades. Hence, the rotating blades did not create a disturbance of the working fluid over the heating surface.
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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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Management of air conditioning system in electronics housing by using thermoelectric Peltier module
(2021-09-15)
Suriyawong, Adirek
;
Saisorn, Sira
;
Suwanpayak, Nathaporn
;
Wongwises, Somchai
The study was the conditioning system of the electronic case by using thermoelectric Peltier module. The Peltier module is used based on the temperature difference of the hot and cold sides, with input electric power in the thermoelectric Peltier module. The hot side of the Peltier module was installed on a side of the heat sinks with heat removing from a Peltier module into a surrounding while the cold side of the Peltier module was installed on the other side of the heat sinks with the heat absorption of the computer case. The electronic case volume is 450x395x240 mm³. The device of cooling loads was installed in the electronic case. The cooling loads were tested with various power of 0, 60, 120, 180, and 240 Watt. The results indicated that the coefficient of performance (COP) increased with the cooling load. Furthermore, the experimental results indicated that the temperature inside the electronic case increased with cooling load because the temperature of the electronic case increased with decreasing the temperature difference between the hot and the cold sides.
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Two-phase heat transfer behaviors of r-134a refrigerant and air-water mixture in A 1 MM internal diameter tube
(2016-01-01)
Saisorn, Sira
;
Wongwises, Somchai
;
Wongpromma, Pakorn
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Benjawun, Phakkhanan
;
Suriyawong, Adirek
Flow boiling of R-134a refrigerant was experimentally conducted in a test section which is a stainless steel tube having internal diameter of 1 mm. The DC power supply was connected to the test section to provide constant surface heat flux conditions. Flow pattern and heat transfer data were obtained for a mass flux range of 252-820 kg/m2s, a heat flux range of 1-21 kW/m2 and a saturation pressure of 8 bar. The flow visualization results showed four different flow patterns including slug flow, throat-Annular flow, churn flow, and annular flow. The flow boiling heat transfer behaviors were also compared with those based on non-boiling two-phase air-water flow in the same test section under constant surface heat flux conditions. For non-boiling two-phase flow experiment, an airwater T-shaped mixer was served to introduce fluids smoothly along the test section. The results indicated that based on the same gas and liquid Reynolds numbers, flow boiling tends to have Nusselt number higher than that for non-boiling gas-liquid flow.
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A critical review of recent investigations on two-phase pressure drop in flow boiling micro-channels
(2012-01-01)
Saisorn, Sira
;
Wongwises, Somchai
Two-phase pressure drop during flow boiling has been studied for several decades. Obviously, the publications available on micro-channels are relatively small compared with those for ordinarily sized channels. Although the use of micro-channels yields several advantages, the pressure drop taking p lace in these extremely small channels is higher than that in the ordinarily sized channels because of the increased wall friction. The knowledge of the two-phase pressure drop characteristics in addition to heat transfer phenomena is essential to the design and evaluation of the micro-systems. In this paper, recent research on the flow boiling pressure drop in micro-scale channels is reviewed. The experimental results as well as the relevant prediction methods based on different researchers are presented.
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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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An experimental investigation of gas-liquid heat transfer in rectangular micro-channels
(2013-12-01)
Saisorn, Sira
;
Wongwises, Somchai
;
Kuaseng, Piyawat
;
Nuibutr, Chompunut
;
Chanphan, Wattana
The investigations of heat transfer and fluid flow characteristics of non-boiling air-water flow in micro-channels are experimentally studied. The gas-liquid mixture from y-shape mixer is forced to flow in the 21 parallel rectangular micro-channels with 40 mm long in the flow direction. Each channel has a width and a depth of 0.45 and 0.41 mm, respectively. Flow visualization is feasible by incorporating the stereozoom microscope into the camera system and different flow patterns are recorded. The experiments are performed under low superficial velocities. Two-phase heat transfer gives better results when compared with the single-phase flow. It is found from the experiment that heat transfer enhancement up to 53% is obtained over the single-phase flow. Also, the change in the configuration of the inlet plenum can result in the different two-phase flow mechanisms. Copyright © 2013 by ASME.
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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
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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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Two-phase flow structures in a helically coiled microchannel: An experimental investigation
(2023-10-01)
Saisorn, Sira
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Benjawun, Phakkhanan
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Suriyawong, Adirek
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Asirvatham, Lazarus Godson
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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.

Saisorn, Sira

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