Kwankaomeng, Sutapat

Preferred name

Alternative Name

Kwankaomeng, S.

Main Affiliation

School of Engineering

sutapat.kw@kmitl.ac.th

Now showing 1 - 10 of 27

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Effect of regenerator on V-type alpha Stirling engine performance
(2021-09-15)
Senviboon, Varit
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Kansuwan, Panya
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Silpsakoolsook, Banterng
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Kwankaomeng, Sutapat
This paper presents the performance of an Alpha-type Stirling engine with and without a regenerator. The Alpha Stirling engine with a V-cylinder arrangement has two pistons that fit in hot and cold cylinders separately. The prototype engine has swept volume of 79 cm3. Working gas is ambient air and coolant is water. The engine performance test was conducted in two operating modes as a heat pump and a heat engine. Working as a heat pump, temperature drop at the cold cylinder was measured relative to work input from an induction motor. By varying its speed using an inverter, the cooling curves of the engine with and without regenerative heat exchanger were obtained for comparison. Working as a heat engine, on the contrary, heat input instead of work input as in the heat pump was applied to the engine by a fuel burner at a constant feed rate of LPG. The temperature on the cold cylinder is controlled by cooling water from the cooler. By varying the cooling water temperature, the variations of work output were measured from the output shaft by the rope brake dynamometer. The performance results of the two operating modes with and without regenerator were compared.
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Thermal characteristics in square channel with 45° staggered baffle inserts
(2010-12-06)
Kwankaomeng, Sutapat
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Skullong, Sompot
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Teschareon, Thavee
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Promvonge, Pongjet
The paper presents a study of heat transfer in a heat exchanger channel inserted with staggered inclined baffles. The channel has a square section with uniform wall heat flux conditions. The fluid flow and heat transfer characteristics are presented for Reynolds numbers based on the hydraulic diameter of the channel ranging from 4000 to 25,000. The inclined baffles with an axial pitch equal to three times of channel height and with the attack angle of 45° are mounted in tandem and staggered arrangement on the lower and upper walls of the test channel. Effects of four baffle-to-channel height ratios (e/H = 0.1, 0.2, 0.3 and 0.4) on heat transfer in terms of Nusselt number and pressure loss in the form of friction factor are experimentally investigated. The experimental result shows that the insertion of staggered inclined baffles with the e/H=0.4 provides higher heat transfer and friction factor values than others. This is caused by higher baffle-to-channel height ratios of using e/H = 0.4 interrupting the flow and diverting its direction thus promoting high levels of mixing over others.
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Heat transfer in square duct fitted diagonally with angle-finned tape-Part 2: Numerical study
(2012-05-01)
Promvonge, Pongjet
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Skullong, Sompol
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Kwankaomeng, Sutapat
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Thiangpong, Chinaruk
A numerical work has been conducted to examine turbulent flow and heat transfer characteristics in a three-dimensional isothermal-fluxed square-duct fitted diagonally with 30°-angle finned tapes. The computations are based on the finite volume method with the SIMPLE algorithm implemented. The air flow and heat transfer characteristics in the duct are presented for Reynolds number (Re) in a range of 4000 to 20,000. In the current study, a straight tape with 30°-angled fins mounted repeatedly on both sides is inserted diagonally into the test duct to generate a pair of longitudinal counter-vortices in assisting chaotic flow mixing in the duct including vortex-induced impingement (VI) effect. Effects of fin blockage ratio (BR= b/. H) and pitch ratio (PR= L/. H) on heat transfer and pressure drop behaviors in the duct are investigated and the results of the finned tape insert are compared with available measurements. The computation reveals that predicted results from the finned tape insert are in good agreement with measured data. The study indicates that the vortex flow can help to induce impingement/reattachment flows (VI effect) on the duct walls leading to drastic increase in the heat transfer rate over the duct. The rise of the BR and the reduction of the PR results in the increase in Nusselt number and friction factor values. The maximum thermal performance is found to be 1.95 for using the finned tape at BR= 0.2 and PR= 1 whereas the Nusselt number ratio is about 4.5 at lower Re. © 2012 Elsevier Ltd.
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Investigation on stability and performance of a free-piston Stirling engine
(2014-01-01)
Kwankaomeng, Sutapat
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Silpsakoolsook, Banterng
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Savangvong, Pongnarin
The stable operation of a free-piston Stirling engine will be achieved when both engine configurations and operating conditions are optimum. This paper presents stability and performance investigation of free-piston Stirling engine. Isothermal analysis is considered in the simulation. Dynamic motion of engine pistons such as the displacer and the power piston are both obtained. For engine design, the optimum parameters are given such as engine specifications, engine characteristics and working conditions to yield the maximum efficiency and reliability. The prototype was built and tested. The comparison of both experimental and simulation results are provided and discussed. 1876-6102© 2014 Published by Elsevier Ltd.
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Numerical heat transfer study of turbulent square-duct flow through inline V-shaped discrete ribs
(2011-12-01)
Promvonge, Pongjet
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Changcharoen, Wayo
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Kwankaomeng, Sutapat
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Thianpong, Chinaruk
A numerical work has been conducted to examine turbulent periodic flow and heat transfer characteristics in a three dimensional square-duct with inline 60° V-shaped discrete thin ribs placed on two opposite heated walls. The isothermal-flux condition is applied only to the upper and lower duct walls while the two sidewalls are insulated, similar to internal passage cooling of gas turbine blades. The computations are based on the finite volume method with the SIMPLE algorithm for handling the pressure-velocity coupling. Air is the working fluid with the flow rate in terms of Reynolds numbers ranging from 10,000 to 25,000. The numerical result is validated with available square-rib measured data and found to agree well with measurement. The computation reveals that the ribbed duct flow is fully developed periodic flow and heat transfer profiles at about x/ D=7-11 downstream of the inlet. Effects of different rib height to duct diameter ratios, BR, on thermal characteristics for a periodic ribbed duct flow are investigated. It is found that a pair of counter-rotating vortices (P-vortex) caused by the rib can induce impingement/attachment flows on the walls leading to greater increase in heat transfer over the test duct. In addition, the rise of BR values leads to the increase in heat transfer and friction loss. The maximum thermal performance is around 1.8 for the rib with BR=0.0725 where the heat transfer rate is about 4.0 times above the smooth duct at lower Reynolds number. © 2011 Elsevier Ltd.
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Investigation and development of modified ross yoke mechanism on alpha-parallel-cylinder stirling engine
(2018-01-01)
Kwankaomeng, Sutapat
This paper presents the redesign and modification of a Ross yoke mechanism driving an alpha Stirling engine with parallel cylinder arrangement. Engine sealing is a crucial factor affecting engine operation, power, and maintenance. Friction and lateral force acting on piston seals induce major wear and finally lead to leakage and losses in both power and operating cost. To reduce these problems, linear reciprocating and balancing motion of both piston and connecting rod are preferred. Mechanical inversion is introduced to invert general motion of connecting rod to rectilinear translation. The original Ross yoke part is altered from pin joints to slot pin joints allowing piston rod to be driven straight. Length of the slot groove was adjusted and optimized. Motion of the modified Ross yoke was investigated theoretically and experimentally. Both analytical model and prototype have the same operating conditions and swept volume of 25 cm3. The ambient air was used as the working gas which was heated by LPG at flow rate of 0.6 kg/h and cooled by water. The maximum speed of 977 rpm was attained. Recorded maximum power and torque were 0.549 W at 486 rpm and 0.014 Nm at 260 rpm, respectively. The modified Ross yoke Stirling engine has operated smoothly when its piston rods were redesigned to slide linearly.
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Investigation and development on performance of a rice-husk powered Stirling engine-generator
(2012-01-01)
Kwankaomeng, Sutapat
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Kongtragool, Bancha
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Silpsakoolsook, Banterng
In few decades, modern Stirling engines were vastly developed and applied as cogeneration systems with high performance and efficiency. The principal advantages of the Stirling engine, external heating and high efficiency, make this engine of the bright future in sustainable energy. Because of the simplicity of its design, the Stirling engine can be manufactured as an inexpensive power source for electricity generation using biomass fuels with low noise and emission, efficient, and environment security. Accordingly, there are many research works of Stirling engine presented and commercial Stirling engines produced as alternative engines for renewable energy. However, power produced by Stirling engine using air as a working gas is usually inefficient and low in power. To increase power and efficiency of the engine, hence, dynamic balance and efficient heat transfer are the key factors. This project aims to present the investigation and development of a few horse power practical Stirling engine-generator using rice husk as biomass fuel. The engine is the betatype feature with rhombic drive mechanism using air as a working gas. Rhombic drive mechanism is designed for engine balance of a single acting engine. A rice husk burner system and heat exchanger configurations of the engine were proposed. A proof-of-concept engine has been built with swept volume of 110 cm3 and tested. The testing results showed that the unpressurized engine started operation in only about 100 seconds at the heater temperature of 460°C with 312 rpm. At the heater temperature of 540°C, the engine speed was 680 rpm. At the engine speed of 280 rpm, the maximum torque was 0.245 Nm while the maximum power was 7.85 W at 360 rpm. The practical prototype is being manufactured with swept volume of 7,000 cm3 and tested to achieve a few horse powers. The engine performance is continuing measured and improved. © 2012 by the American Institute of Aeronautics and Astronautics, Inc.
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Heat transfer in square duct fitted diagonally with angle-finned tape-Part 1: Experimental study
(2012-05-01)
Promvonge, Pongjet
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Skullong, Sompol
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Kwankaomeng, Sutapat
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Thiangpong, Chinaruk
The paper presents an experimental study on turbulent flow and heat transfer characteristics in a square duct fitted diagonally with 30° angle-finned tapes. The tested duct has a square section and uniform heat-fluxed walls and the flow rate of air used as the test fluid is presented in terms of Reynolds number from 4000 to 23,000. The angle-finned straight tape in the present work is newly invented without previous investigations available. The insertion of the finned tape is performed with three ratios of fin pitch to duct height (PR= P/. H) at the fin attack angle of 30° with respect to the main flow direction. The finned tape inserted diagonally in the duct is expected to generate a longitudinal vortex flow pair through the heated duct. Influences of five fin-to-duct height ratios (BR= b/. H= 0.1-0.3) for each fin pitch on thermal and flow friction characteristics of the inserted duct are investigated. The experimental result shows that at smaller fin pitch spacing, the finned tape with BR= 0.3 provides the highest heat transfer and friction factor but the one with BR= 0.2 and PR= 1.0 yields the best thermal performance. The thermal performance of the newly invented finned tape turbulator is found to be much higher than that of the wire coil/twisted tape turbulator. © 2012 Elsevier Ltd.
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Enhanced heat transfer in a triangular ribbed channel with longitudinal vortex generators
(2010-06-01)
Promvonge, Pongjet
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Chompookham, Teerapat
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Kwankaomeng, Sutapat
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Thianpong, Chinaruk
Effects of combined ribs and winglet type vortex generators (WVGs) on forced convection heat transfer and friction loss behaviors for turbulent airflow through a constant heat flux channel are experimentally investigated in the present work. The cross-section of the ribs placed inside the opposite channel walls to create a reverse flow is an isosceles triangle shape. Two rib arrangements, namely, in-line and staggered arrays, are introduced. Also, two pairs of the WVGs with various attack angles (α) of 60°, 45° and 30° are mounted on the test duct entrance to create a longitudinal vortex flow through the test channel. Measurements are carried out for a rectangular duct of aspect ratio, AR = 10 and height, H = 30 mm with a single rib height, e/H = 0.13 and rib pitch, P/H = 1.33. The flow rate is in terms of Reynolds numbers based on the inlet hydraulic diameter of the channel ranging from 5000 to 22,000. The experimental results show a significant effect of the presence of the rib turbulator and the WVGs on the heat transfer rate and friction loss over the smooth wall channel. The values of Nusselt number and friction factor for utilizing both the rib and the WVGs are found to be considerably higher than those for using the rib or the WVGs alone. The larger the attack angle value leads to higher heat transfer and friction loss than the lower one. The in-line rib together with the WVGs provides higher heat transfer and friction loss than the staggered one for similar operating conditions. In common with the WVGs, the in-line rib yields the highest increase in both the Nusselt number and the friction factor but the rib with staggered array shows better thermal performance than the others. © 2010 Elsevier Ltd. All rights reserved.
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Numerical prediction on laminar heat transfer in square duct with 30° angled baffle on one wall
(2010-08-01)
Kwankaomeng, Sutapat
;
Promvonge, Pongjet
A numerical investigation on periodic laminar flow and heat transfer behaviors in a three-dimensional isothermal wall square duct fitted with 30° angled baffles on lower duct wall only is presented. The computations based on a finite volume method with the SIMPLE algorithm have been conducted for the fluid flow in terms of Reynolds numbers ranging from 100 to 2000. The angled baffles with attack angle of 30° are mounted periodically on the lower duct wall to generate a longitudinal vortex flow through the tested duct. Effects of different baffle height and three pitch length ratios on heat transfer and flow characteristics in the duct are investigated. The study shows that the longitudinal vortex flow created by the baffle helps to induce impinging flows over the baffle trailing end sidewall and the inter-baffle cavity wall resulting in drastic increase in heat transfer rate over the test duct. The computational results reveal that the Nusselt number ratio and the maximum thermal enhancement factor values for using the angled baffle are, respectively, found to be about 7.9 and 3.1 at Re=2000, BR=0.3 and PR=1.5. © 2010 Elsevier Ltd.

Kwankaomeng, Sutapat

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