Saisorn, Sira
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Saisorn, Sira
Alternative Name
Saisorn, S.
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Email
sira.sa@kmitl.ac.th
11 results
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Item type:Publication, Pool boiling heat transfer enhancement of distilled water with passive rotating blades installed above the heating surface(2017-01-01); ; Wongwises, SomchaiThis 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental investigation on flow pattern and void fraction for two-phase gas-liquid upflow in a vertical helically coiled micro-channel(2025-03-01); ; Wongwises, SomchaiTo 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Two-phase flow structures in a helically coiled microchannel: An experimental investigation(2023-10-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Two-phase flow of R-134a refrigerant during flow boiling through a horizontal circular mini-channel(2011-09-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An investigation of horizontal and vertical flow boiling in a single channel with a confinement number beyond the threshold of micro-scale flow(2021-11-01); ; ; Wongwises, SomchaiThe gravitational force effect is of concern when designing flow boiling systems deployed on Earth and in space. A study of the R-134a flow boiling inside the horizontal and vertical channels was experimentally performed to explore the flow orientations' effect on flow pattern and heat transfer characteristics. The test section was a 0.5 mm diameter tube from which the corner effect was excluded. The single channel was used to avoid disturbances that flow maldistribution could possibly cause in the multiple channels. The experimental two-phase flow corresponded to a 1.75 confinement number, which was above the threshold for micro-scale flow. The results indicated the flow regime map, which was less affected by the channel orientation except for that slug flow pattern that was unable to survive during the vertical downflow and vertical upflow. Also, based on the present micro-scale flow, the heat transfer results were mostly independent of the gravitational force effect, and the nucleate boiling and convective mechanisms tended to govern them. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The difference in flow pattern, heat transfer and pressure drop characteristics of mini-channel flow boiling in horizontal and vertical orientations(2018-04-01); ; Wongwises, SomchaiFlow pattern, heat transfer, and pressure drop data for different flow orientations was presented in this study. The data was obtained based on flow boiling experiments with R-134a flow through a 1 mm diameter channel which was aligned in different orientations, i.e. horizontal flow, vertical upward flow, and vertical downward flow. A constant surface heat flux condition was performed under a saturation pressure of 8 bar, a heat flux range of 1–60 kW/m<sup>2</sup>, and a mass flux range of 250–820 kg/m<sup>2</sup>s. The experimental results showed the importance of the change in the flow direction. The shape of the gas slug during horizontal flow did not look the same as in the vertical orientations. Heat transfer coefficient and pressure drop became increased when the refrigerant flowed in the vertical downward direction. The experimental data was also compared with the existing prediction methods. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Two-phase air-water flow in micro-channels: An investigation of the viscosity models for pressure drop prediction(2011-02-01); Wongwises, SomchaiAdiabatic two-phase air-water flow is experimentally studied in this work. Two channels, made of fused silica, with different diameters of 0.53 and 0.15. mm are used as test sections. The void fraction data for both tubes are obtained by image analysis. For the larger channel, the void fraction is found to be a linear relationship with the volumetric quality. In the case of the smaller one, however, the non-linear void fraction is obtained. The measured frictional pressure drop data are compared with the predictions regarding the homogeneous flow assumption. Several well-known two-phase viscosity models are subsequently evaluated for applicability to micro-channels. © 2010 Elsevier Ltd. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Adiabatic two-phase gas-liquid flow behaviors during upward flow in a vertical circular micro-channel(2015-12-01); Wongwises, SomchaiA two-phase air-water flow experiment was carried out to obtain flow pattern, void fraction, and pressure drop data from a vertical micro-channel, which was a fused silica tube with a diameter of 0.53. mm and a length of 320. mm. The adiabatic two-phase flow behaviors during vertical upward direction were experimentally investigated, and consequently, a buoyancy effect can be detected in this work. A flow visualization study was performed, leading to observation of slug flow, throat-annular flow, churn flow, annular flow, and annular-rivulet flow. The shape of the interfacial surface in the slug flow pattern was deformed during vertical upward flow, which was different from the bullet-shaped gas slug observed in the horizontal channel. The flow visualization results also indicate that the flow pattern map for vertical upward flow is not completely compatible with that for horizontal flow. Image analysis was performed to determine the void fraction, which increases linearly with increasing volumetric quality. The vertical upward flow gave a lower void fraction than the horizontal flow. The frictional pressure drop can be increased when the churn flow is formed in the channel. In addition, vertical upward flow can result in higher pressure drop when compared with the horizontal channel. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Flow pattern and heat transfer characteristics of R-134a refrigerant during flow boiling in a horizontal circular mini-channel(2010-09-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Heat transfer characteristics of gas-liquid flow in horizontal rectangular micro-channels(2014-05-01);