Kwankaomeng, Sutapat
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Kwankaomeng, Sutapat
Alternative Name
Kwankaomeng, S.
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sutapat.kw@kmitl.ac.th
27 results
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Item type:Publication, Design optimization on Ross yoke mechanism for stirling engine(2026-05-15); This paper presents a design analysis and optimization of an Alpha-type Stirling engine with a double-acting mechanism. The engine has four cylinders with a piston diameter and length of 60 mm and 113.2 mm, respectively. Using the Ross yoke with a double-acting mechanism, the engine has a swept volume and stroke of 384.69 cm3 and 34 mm. The working gas is 10 bar pressurized air. ADAMS software is used to access dynamic balancing and kinematic analysis. Operating characteristics and performance were investigated and parameterized for optimization. Minimizing the stroke difference of four pistons, uniform piston stroke, is the objective function with the top and bottom-dead constraints. The length of the rocking lever attached to the yoke link influences the smooth reciprocating of all pistons. The simulation results with searching method optimization show the dynamic motion of the Ross yoke mechanism that can be adjusted to the optimal piston stroke with the suitable length of the rocking lever. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Heat transfer augmentation in a wedge-ribbed channel using winglet vortex generators(2010-02-01); ; Experimental investigations have been carried out to study the effect of combined wedge ribs and winglet type vortex generators (WVGs) on heat transfer and friction loss behaviors for turbulent airflow through a constant heat flux channel. To create a reverse flow in the channel, two types of wedge (right-triangle) ribs are introduced: wedge ribs pointing downstream and pointing upstream. The arrangements of both rib types placed inside the opposite channel walls are in-line and staggered arrays. To generate longitudinal vortex flows through the tested section, two pairs of the WVGs with the attack angle of 60° are mounted on the test channel entrance. The test channel has an aspect ratio, AR = 10 and height, H = 30 mm with a rib height, e/H = 0.2 and rib pitch, P/H = 1.33. The flow rate in terms of Reynolds numbers is based on the inlet hydraulic diameter of the channel ranging from 5000 to 22,000. The presence of the combined ribs and the WVGs shows the significant increase in heat transfer rate and friction loss over the smooth channel. The Nusselt number and friction factor values obtained from combined the ribs and the WVGs are found to be much higher than those from the ribs/WVGs alone. In conjunction with the WVGs, the in-line wedge pointing downstream provides the highest increase in both the heat transfer rate and the friction factor while the staggered wedge pointing upstream yields the best thermal performance. © 2009 Elsevier Ltd. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of regenerator on V-type alpha Stirling engine performance(2021-09-15); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Numerical investigation of laminar heat transfer in a square channel with 45° inclined baffles(2010-02-01); ; A numerical investigation of laminar periodic flow and heat transfer in a three-dimensional isothermal-wall square channel fitted with 45° inclined baffles on one channel wall is carried out in the present work. The finite volume method is introduced and the SIMPLE algorithm has been implemented for all computations. The fluid flow and heat transfer characteristics are presented for Reynolds numbers ranging from 100 to 1200. The 45° baffle mounted only on the lower channel wall has a height of b and an axial pitch length (L) equal to channel height (H). Effects of flow blockage ratios, BR = b/H = 0.1-0.5, on heat transfer and pressure loss in the square channel are examined and also compared with the typical case of the transverse baffle (or 90° baffle). It is found that apart from the rise of Reynolds number, the increase in the blockage ratio with the attack angle (α) of 45° results in considerable increases in the Nusselt number and friction factor values. The use of the 45° baffle can help to generate a streamwise main vortex flow throughout the channel leading to fast and chaotic mixing of flow between the core and the wall regions. In addition, the computational results reveal that the significant increase in heat transfer rate is due to impingement jets induced by a longitudinal vortex pair (P-vortex) of flow, appearing on the upper, lower and baffle trailing end side walls. The appearance of vortex-induced impingement flows created by the baffles leads to the maximum thermal enhancement factor of about 2.2 at BR = 0.4 and Re = 1200. The enhancement factor of the 45° baffle investigated is found to be higher than that of the 90° baffle for all Reynolds numbers and baffle heights. © 2009 Elsevier Ltd. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Periodic laminar flow and heat transfer in a channel with 45° staggered V-baffles(2010-08-01); A numerical investigation has been carried out to examine periodic laminar flow and heat transfer characteristics in a three-dimensional isothermal wall channel of aspect ratio, AR=2 with 45° staggered V-baffles. The computations are based on the finite volume method, and the SIMPLE algorithm has been implemented. The fluid flow and heat transfer characteristics are presented for Reynolds numbers based on the hydraulic diameter of the channel ranging from 100 to 1200. To generate two pair of main streamwise vortex flows through the tested section, V-baffles with an attack angle of 45° are mounted in tandem and staggered arrangement on the lower and upper walls of the channel. Effects of different baffle heights on heat transfer and pressure drop in the channel are studied and the results of the V-baffle pointing upstream are also compared with those of the V-baffle pointing downstream. It is apparent that in each of the main vortex flows, a pair of streamwise twisted vortex (P-vortex) flows can induce impinging flows on a sidewall and a wall of the interbaffle cavity leading to drastic increase in heat transfer rate over the channel. In addition, the rise in the V-baffle height results in the increase in the Nusselt number and friction factor values. The computational results reveal that the optimum thermal enhancement factor is around 2.6 at baffle height of 0.15. times of the channel height for the V-baffle pointing upstream while is about 2.75 at baffle height of 0.2. times for the V-baffle pointing downstream. © 2010 Elsevier Ltd. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A fractional horsepower free-piston Stirling engine-pump(2008-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal performance enhancement in solar air heater channel with periodically V-shaped baffles(2012-12-01); The research paper presents a study on thermal performance enhancement in a rectangular channel heat exchanger mounted with periodically V-shaped baffles. The channel has an aspect ratio (width to height ratio), AR=10 and height, H=30 mm while baffle characteristics are the baffle to channel height ratio, e/H=0.2, 0.3 and 0.4; the baffle pitch to channel height ratio, PR=P/H=2 and 2.67; the attack angle (α) of 30°relative to the flow direction. The experiment has been conducted by varying air flow velocity in order to adjust Reynolds number range from 5000 to 25,000. The upper wall of the channel is uniformly heated as a constant heat flux while the rests are covered with thermal insulations to reduce heat loss to surroundings. The effects of the baffles on Nusselt number and friction factor have been examined. The overall performance of tested baffled channel is evaluated to obtain the degree of heat transfer enhancement and friction factor induced by baffles with respect to the smooth channel under similar flow conditions. © 2011 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Heat transfer enhancement and investigation on Stirling engine heater with biomass application(2021-09-15); This research presents a heat transfer enhancement technique on a Stirling engine heater equipped with a biomass fuel burner. ANSYS Fluent software was utilized in the computation of heat transfer, including heat flux and temperature distribution on the heater component of the engine. Effects of the increasing of the heating surface on heat transfer enhancement were investigated. Fin effectiveness resulting from the fin parameter variation of the heater, such as fin diameter and fin spacing, was evaluated for heat transfer under forced convection and heat conduction. This simulation results in the fin configuration most suitable for the fabrication of our Stirling engine heater. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal characteristics in square channel with 45° staggered baffle inserts(2010-12-06); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Turbulent heat transfer enhancement in a heat exchanger using helically corrugated tube(2011-03-01); The augmentation of convective heat transfer in a single-phase turbulent flow by using helically corrugated tubes has been experimentally investigated. Effects of pitch-to-diameter ratio (P/D<inf>H</inf>=0.18, 0.22 and 0.27) and rib-height to diameter ratio (e/D<inf>H</inf>=0.02, 0.04 and 0.06) of helically corrugated tubes on the heat transfer enhancement, isothermal friction and thermal performance factor in a concentric tube heat exchanger are examined. The experiments were conducted over a wide range of turbulent fluid flow of Reynolds number from 5500 to 60,000 by employing water as the test fluid. Experimental results show that the heat transfer and thermal performance of the corrugated tube are considerably increased compared to those of the smooth tube. The mean increase in heat transfer rate is between 123% and 232% at the test range, depending on the rib height/pitch ratios and Reynolds number while the maximum thermal performance is found to be about 2.3 for using the corrugated tube with P/D<inf>H</inf>=0.27 and e/D<inf>H</inf>=0.06 at low Reynolds number. Also, the pressure loss result reveals that the average friction factor of the corrugated tube is in a range between 1.46 and 1.93 times over the smooth tube. In addition, correlations of the Nusselt number, friction factor and thermal performance factor in terms of pitch ratio (P/D<inf>H</inf>), rib-height ratio (e/D<inf>H</inf>), Reynolds number (Re), and Prandtl number (Pr) for the corrugated tube are determined, based on the curve fitting of the experimental data. © 2010 Elsevier Ltd.