Monsak Pimsarn - Academia.edu (original) (raw)
Papers by Monsak Pimsarn
Applied Thermal Engineering, 2017
MATEC web of conferences, 2018
自動車技術会大会学術講演会講演予稿集(CD-ROM), 2017
MATEC Web of Conferences, 2018
Thailand has a railway system that is available throughout the country, so there are several rail... more Thailand has a railway system that is available throughout the country, so there are several railroad crossings. These crossings are generally made of concrete or logs with multiple constraints. There are some disadvantages of concrete railroad crossing, such as, crack, noise during car passing over. To overcome these disadvantages, the softer materials should be used instead. Therefore, this research proposes the natural rubber, widely grown throughout Thailand, panel railroad crossing. However, the natural rubber alone is not enough to withstand the harsh condition. Thus, it is necessary to have some addition ingredients that will enhance the natural rubber properties. The material used in this research is a rubber compound between Chloroprene Rubber (CR) 75% and Natural rubber (NR) 25% blend with additives such as carbon black (CB), magnesium oxide (MgO) and sulfur (S8). The objectives of this article were to analyze the deformation of the natural rubber panel railroad crossing a...
Lecture Notes in Electrical Engineering, 2012
As being the most important part in the energy supply system, the battery must be carefully monit... more As being the most important part in the energy supply system, the battery must be carefully monitored in order to optimize the performance and to prolong its life. The most affected parameter to the battery is the operating temperature as the higher operating temperature increase the performance but shorten the life and with lower operating temperature can ensure longer life but reduce the performance. With this, the battery thermal management system is created in order to keep the operating temperature at the suitable range. In order to achieve this, thermal behaviour in loaded condition must be analysed beforehand. A series of experimental procedures is designed for the selected lithium iron phosphate battery to determine the thermal properties such as heat capacity, heat generation, and cell temperature according to the electrical load applied. Derived thermal model of lithium ion battery was utilized for this purpose as it shows the relationship between the thermal, electrical properties and other parameters such as voltage, current and cell temperature. When the battery is applied with electrical load, the data of voltage, current, and surface cell temperature can be used to determine the thermal properties and at the same time, electrical properties such as open circuit voltage, state of charge and internal resistance are also obtained for the performance evaluation.
International Journal of Computer Applications in Technology, 2015
This study aims to create a simplified model of a reinforced square hollow section SHS T-joint fo... more This study aims to create a simplified model of a reinforced square hollow section SHS T-joint found in bus superstructures. The approach is to use a combination of one-and two-dimensional finite element models to represent a reference three-dimensional finite element model of the joint and determine stress correction factors as functions of the geometrical variables of the joint. This approach requires the stiffness of the simplified model to be equivalent to that of the reference model. By using a stiffness error function and a three-factor design of experiment DOE, the best of four trial models, with minimum average stiffness error, was identified. The stress correction factors were then determined under static in-plane bending loads. A polynomial regression model was used to construct the relationship between the stress correction factors and the thickness-to-width ratios of the joint. The correlation coefficient of 0.9845 indicated a strong relationship and the t score confirmed its significance.
Social Science Research Network, 2022
Case Studies in Thermal Engineering, Aug 1, 2023
Chemical Engineering and Processing, Oct 1, 2015
Case Studies in Thermal Engineering, Nov 1, 2021
Case Studies in Thermal Engineering, Aug 1, 2022
Case Studies in Thermal Engineering
Applied Thermal Engineering, 2017
Case Studies in Thermal Engineering, 2021
Abstract Experiments were performed to study the thermohydraulic behaviors of heating tubes equip... more Abstract Experiments were performed to study the thermohydraulic behaviors of heating tubes equipped with serrated-ring bundles as turbulators. Their thermohydraulic characteristics are reported in terms of Nusselt numbers (Nu) and friction factors (f) as well as performance in terms of a thermohydraulic performance index (TPI) at identical pumping power. Influences of serrated-ring diagonal angles ( θ = 15°, 30°, 45° and 60°), pitch ratios (PR = 6.0, 8.0 and 12.0) and Re were examined. Various geometries of serrated-ring bundles can affect the laminar sub-layer disruption, creating a reversing flow, reconnecting the separated flow to the surface, and delaying the thermal/velocity boundary layer development. These are the most important mechanisms that lead to enhanced force convection heat transfer in a fluid flow. The heat transfer rate, friction loss and TPI increased with decreasing pitch ratio (PR) and serrated-ring diagonal angle ( θ ). Heat transfer rate and friction factor were increased to 2.2 and 8.8 times that of a plain tube, respectively. Over the range investigated, the highest TPI, 1.16, was found using a serrated-ring bundle having θ = 15° and PR = 6.0 at Re = 4000.
Journal of Thermal Analysis and Calorimetry
Energies
The experimental examination of local heat transfer, thermal intensification, friction factors, a... more The experimental examination of local heat transfer, thermal intensification, friction factors, and thermal performance factors (TPF) in a rectangular channel with square-winged transverse baffles (SW-TB) are presented in this paper. The purpose of this study is to modify the typical transverse baffles (TB) into square-winged transverse baffles (SW-TB) in order to improve the thermal performance and heat transfer rate of the channel. The effects of SW-TBs with various wing attack angles and Reynolds numbers on the heat transfer performance characteristics were examined using a thermochromic liquid crystal sheet. In the experiments, the SW-TBs were attached to the bottom wall of the channel, which had an aspect ratio (W:H) of 3.75:1. The SW-TBs had a width (w) of 150 mm, a square perforated cross-sectional area (a × b) of 8 × 8 mm2, and attack angles (θ) of 0° (solid transverse-baffle), 22.5°, 45°, 67.5°, and 90°. The bottom wall of the channel was evenly heated, while the other wall...
Walailak Journal of Science and Technology (WJST)
The dynamic behavior of functionally graded (FG) sandwich beams resting on the Pasternak elastic ... more The dynamic behavior of functionally graded (FG) sandwich beams resting on the Pasternak elastic foundation under an arbitrary number of harmonic moving loads is presented by using Timoshenko beam theory, including the significant effects of shear deformation and rotary inertia. The equation of motion governing the dynamic response of the beams is derived from Lagrange’s equations. The Ritz and Newmark methods are implemented to solve the equation of motion for obtaining free and forced vibration results of the beams with different boundary conditions. The influences of several parametric studies such as layer thickness ratio, boundary condition, spring constants, length to height ratio, velocity, excitation frequency, phase angle, etc., on the dynamic response of the beams are examined and discussed in detail. According to the present investigation, it is revealed that with an increase of the velocity of the moving loads, the dynamic deflection initially increases with fluctuations...
Applied Thermal Engineering, 2017
MATEC web of conferences, 2018
自動車技術会大会学術講演会講演予稿集(CD-ROM), 2017
MATEC Web of Conferences, 2018
Thailand has a railway system that is available throughout the country, so there are several rail... more Thailand has a railway system that is available throughout the country, so there are several railroad crossings. These crossings are generally made of concrete or logs with multiple constraints. There are some disadvantages of concrete railroad crossing, such as, crack, noise during car passing over. To overcome these disadvantages, the softer materials should be used instead. Therefore, this research proposes the natural rubber, widely grown throughout Thailand, panel railroad crossing. However, the natural rubber alone is not enough to withstand the harsh condition. Thus, it is necessary to have some addition ingredients that will enhance the natural rubber properties. The material used in this research is a rubber compound between Chloroprene Rubber (CR) 75% and Natural rubber (NR) 25% blend with additives such as carbon black (CB), magnesium oxide (MgO) and sulfur (S8). The objectives of this article were to analyze the deformation of the natural rubber panel railroad crossing a...
Lecture Notes in Electrical Engineering, 2012
As being the most important part in the energy supply system, the battery must be carefully monit... more As being the most important part in the energy supply system, the battery must be carefully monitored in order to optimize the performance and to prolong its life. The most affected parameter to the battery is the operating temperature as the higher operating temperature increase the performance but shorten the life and with lower operating temperature can ensure longer life but reduce the performance. With this, the battery thermal management system is created in order to keep the operating temperature at the suitable range. In order to achieve this, thermal behaviour in loaded condition must be analysed beforehand. A series of experimental procedures is designed for the selected lithium iron phosphate battery to determine the thermal properties such as heat capacity, heat generation, and cell temperature according to the electrical load applied. Derived thermal model of lithium ion battery was utilized for this purpose as it shows the relationship between the thermal, electrical properties and other parameters such as voltage, current and cell temperature. When the battery is applied with electrical load, the data of voltage, current, and surface cell temperature can be used to determine the thermal properties and at the same time, electrical properties such as open circuit voltage, state of charge and internal resistance are also obtained for the performance evaluation.
International Journal of Computer Applications in Technology, 2015
This study aims to create a simplified model of a reinforced square hollow section SHS T-joint fo... more This study aims to create a simplified model of a reinforced square hollow section SHS T-joint found in bus superstructures. The approach is to use a combination of one-and two-dimensional finite element models to represent a reference three-dimensional finite element model of the joint and determine stress correction factors as functions of the geometrical variables of the joint. This approach requires the stiffness of the simplified model to be equivalent to that of the reference model. By using a stiffness error function and a three-factor design of experiment DOE, the best of four trial models, with minimum average stiffness error, was identified. The stress correction factors were then determined under static in-plane bending loads. A polynomial regression model was used to construct the relationship between the stress correction factors and the thickness-to-width ratios of the joint. The correlation coefficient of 0.9845 indicated a strong relationship and the t score confirmed its significance.
Social Science Research Network, 2022
Case Studies in Thermal Engineering, Aug 1, 2023
Chemical Engineering and Processing, Oct 1, 2015
Case Studies in Thermal Engineering, Nov 1, 2021
Case Studies in Thermal Engineering, Aug 1, 2022
Case Studies in Thermal Engineering
Applied Thermal Engineering, 2017
Case Studies in Thermal Engineering, 2021
Abstract Experiments were performed to study the thermohydraulic behaviors of heating tubes equip... more Abstract Experiments were performed to study the thermohydraulic behaviors of heating tubes equipped with serrated-ring bundles as turbulators. Their thermohydraulic characteristics are reported in terms of Nusselt numbers (Nu) and friction factors (f) as well as performance in terms of a thermohydraulic performance index (TPI) at identical pumping power. Influences of serrated-ring diagonal angles ( θ = 15°, 30°, 45° and 60°), pitch ratios (PR = 6.0, 8.0 and 12.0) and Re were examined. Various geometries of serrated-ring bundles can affect the laminar sub-layer disruption, creating a reversing flow, reconnecting the separated flow to the surface, and delaying the thermal/velocity boundary layer development. These are the most important mechanisms that lead to enhanced force convection heat transfer in a fluid flow. The heat transfer rate, friction loss and TPI increased with decreasing pitch ratio (PR) and serrated-ring diagonal angle ( θ ). Heat transfer rate and friction factor were increased to 2.2 and 8.8 times that of a plain tube, respectively. Over the range investigated, the highest TPI, 1.16, was found using a serrated-ring bundle having θ = 15° and PR = 6.0 at Re = 4000.
Journal of Thermal Analysis and Calorimetry
Energies
The experimental examination of local heat transfer, thermal intensification, friction factors, a... more The experimental examination of local heat transfer, thermal intensification, friction factors, and thermal performance factors (TPF) in a rectangular channel with square-winged transverse baffles (SW-TB) are presented in this paper. The purpose of this study is to modify the typical transverse baffles (TB) into square-winged transverse baffles (SW-TB) in order to improve the thermal performance and heat transfer rate of the channel. The effects of SW-TBs with various wing attack angles and Reynolds numbers on the heat transfer performance characteristics were examined using a thermochromic liquid crystal sheet. In the experiments, the SW-TBs were attached to the bottom wall of the channel, which had an aspect ratio (W:H) of 3.75:1. The SW-TBs had a width (w) of 150 mm, a square perforated cross-sectional area (a × b) of 8 × 8 mm2, and attack angles (θ) of 0° (solid transverse-baffle), 22.5°, 45°, 67.5°, and 90°. The bottom wall of the channel was evenly heated, while the other wall...
Walailak Journal of Science and Technology (WJST)
The dynamic behavior of functionally graded (FG) sandwich beams resting on the Pasternak elastic ... more The dynamic behavior of functionally graded (FG) sandwich beams resting on the Pasternak elastic foundation under an arbitrary number of harmonic moving loads is presented by using Timoshenko beam theory, including the significant effects of shear deformation and rotary inertia. The equation of motion governing the dynamic response of the beams is derived from Lagrange’s equations. The Ritz and Newmark methods are implemented to solve the equation of motion for obtaining free and forced vibration results of the beams with different boundary conditions. The influences of several parametric studies such as layer thickness ratio, boundary condition, spring constants, length to height ratio, velocity, excitation frequency, phase angle, etc., on the dynamic response of the beams are examined and discussed in detail. According to the present investigation, it is revealed that with an increase of the velocity of the moving loads, the dynamic deflection initially increases with fluctuations...