Suriyawong, Adirek

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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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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
;
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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Number of blades of rotating blades affecting the boiling heat transfer enhancement of distilled water
(2019-09-09)
Suriyawong, A.
;
Saisorn, S.
;
Kawahara, A.
;
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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The Enhancement of Pool Boiling Heat Transfer by Passive Technique using Rotating Blades Applied on the Nucleation Sites
(2019-10-25)
Suriyawong, A.
;
Saisorn, S.
;
Kawahara, A.
;
Wongwises, S.
This paper was aimed to investigate the nucleate boiling phenomena with the presence of the rotating blades above the heat transfer surface. The boiling process at 1 atm was carried out by allowing heat transferred from a copper surface to distilled water. The 4-blade rotor made from copper was vertically installed at different distances above the heat transfer surface (L<inf>SB</inf>). The flow visualization during phase-change phenomena under heat flux values of 160-610 kW/m2 was feasible by high-speed camera. The results showed that pool boiling at the heat flux of 160 kW/m2 corresponded to isolated bubble regime, and at the value of 610 kW/m2, the column regime was observed. In addition to the two-phase flow pattern, the heat transfer coefficient data was reported in this work. The heat transfer results were found to depend on the distance at which the rotor was installed.

Suriyawong, Adirek

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