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 13

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Characterization of diabatic air-water flow in helically coiled micro-channel
(2026-05-15)
Benjawun, Phakkhanan
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Chingulpitak, Sakkarin
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Pratuyai, Kritsada
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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
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Saisorn, Sira
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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
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Wongwises, Somchai
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Wongpromma, Pakorn
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Benjawun, Phakkhanan
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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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Experimental investigation of non-boiling gas-liquid two-phase flow in helically coiled micro-channel
(2026-05-15)
Benjawun, Phakkhanan
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Chingulpitak, Sakkarin
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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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An experimental investigation of gas-liquid heat transfer in rectangular micro-channels
(2013-12-01)
Saisorn, Sira
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Wongwises, Somchai
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Kuaseng, Piyawat
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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
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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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Flow boiling heat transfer characteristics of R-134a in horizontal and vertical mini-channels
(2010-12-01)
Saisorn, Sira
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Kaew-On, Jatuporn
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Wongwises, Somchai
Heat transfer experiments are carried out to obtain the data of R-134a during flow boiling in a circular mini-channel having a diameter of 1.75 mm and a length of 600 mm. The DC power supply generating 80 A at 12 V is used to apply heat to the test section. T-type thermocouples are installed at the inlet and outlet of the test section to measure the system temperature. The 10 thermocouples are installed on the top and bottom sides at equal distances along the tube to measure the wall temperature. Variable area type flow meters calibrated specially in the range 0.02-0.2 LPM for R-134a by the manufacturer are used to measure the refrigerant flow rate. A transparent tube is installed to match up with the test section outlet and to serve as a viewing window for visualisation. Two sets of the horizontal flow and vertical upward flow data are analysed. Flow regime map and heat transfer coefficient tend to be dependent with flow direction under the certain experimental conditions. Copyright © 2010 by ASME.
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Flow pattern, void fraction and pressure drop during adiabatic two-phase gas-liquid flow in vertical micro-channel
(2012-12-01)
Saisorn, Sira
;
Wongwises, Somchai
The experimental investigation is performed to study twophase flow pattern, void fraction and pressure drop characteristics in a vertical micro-channel. The test section is a fused silica tube with a diameter of 0.53 mm and a length of 320 mm. Air and water are used as working fluid which is introduced to the test section in vertical upward direction. The test runs are done at superficial velocities of gas and liquid ranging respectively from 0.375 to 21.187 m/s and 0.004 to 2.436 m/s. Stereozoom microscope mounted together with camera are employed to conduct flow visualization from which slug flow, throat-annular flow, churn flow, annular flow and annular-rivulet flow are observed. Based on image analysis, void fraction data are obtained and found to be linear relationship with volumetric quality. The frictional pressure drop is relatively high when the formation of churn flow is established. Besides, the two-phase frictional multiplier is found to be strongly dependent on both mass flux and flow pattern. Copyright © 2012 by ASME.
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Number of blades of rotating blades affecting the boiling heat transfer enhancement of distilled water
(2019-09-09)
Suriyawong, A.
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Saisorn, S.
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Kawahara, A.
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Wongwises, S.
This study examined the nucleate pool boiling characteristics of distilled water attached to a heating surface with a horizontal circular plate above which the rotating blades were installed. The experiments were performed to explore the effects of number of blades as well as the visualization of pool boiling phenomena on nucleate boiling heat transfer characteristics. The rotating blades were made from copper material, with the number of blade of 2, 3 and 4 blades. The results showed that, the rotor with 4 blades yielded a higher heat transfer coefficient than those with 2 or 3 blades. This is because the increased number of blade provided more chance for the bubbles to strike the rotating blades. Hence, the rotating blades did create a commotion of the working fluid above the heating surface. Camera frames were captured using an Aos Promon Studio at the heat fluxes of about 160-610 kW/m2 to identify the location of bubble nucleation for each configuration. The photographic observations showed that, the pool boiling phenomenon with the heat flux value of about 160 kW/m2 corresponded to the isolated bubble, and the boiling characteristic with the heat flux value of about 610 kW/m2 were based on the column regime.
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Experimental study of adiabatic two-phase micro-scale up-flow in helical tube
(2026-05-15)
Chorprasert, Vissuta
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Chingulpitak, Sakkarin
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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.

Saisorn, Sira

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