Pub Date : 2023-04-15DOI: 10.51316/jst.165.etsd.2023.33.2.1
Concentrated tomato is produced typically from tomatoes by the conventional method of concentration. Recently, vacuum-concentration processes have been developed to concentrate and reduce the variation caused by high temperature. The aim of this study is to simulate water evaporation and change of tomato juice concentration during vacuum concentration. Mathematical and simulation models for vacuum condensate system are proposed and implemented. Matlab's ode45 function is used to solve differential equations and simulate systems. The effect of the concentration and condensate temperature on the Brix concentration of the solution was investigated based on the model. Experiments were carried out with 10kg of tomato juice, the initial Brix concentration was 4, with the concentration temperatures of 60 oC and 65 oC, resulting in the correlation coefficient R2 reaching 0.9624 and 0.9837, respectively. This result shows a high compatibility between simulation and experiments. The simulations accurately represent the kinetics of the concentration process and the change in temperature and Brix of tomato juice products in the concentration chamber.
{"title":"Modeling the Effect of Temperature on Brix Concentration of Tomato Juice during Vacuum Concentration","authors":"","doi":"10.51316/jst.165.etsd.2023.33.2.1","DOIUrl":"https://doi.org/10.51316/jst.165.etsd.2023.33.2.1","url":null,"abstract":"Concentrated tomato is produced typically from tomatoes by the conventional method of concentration. Recently, vacuum-concentration processes have been developed to concentrate and reduce the variation caused by high temperature. The aim of this study is to simulate water evaporation and change of tomato juice concentration during vacuum concentration. Mathematical and simulation models for vacuum condensate system are proposed and implemented. Matlab's ode45 function is used to solve differential equations and simulate systems. The effect of the concentration and condensate temperature on the Brix concentration of the solution was investigated based on the model. Experiments were carried out with 10kg of tomato juice, the initial Brix concentration was 4, with the concentration temperatures of 60 oC and 65 oC, resulting in the correlation coefficient R2 reaching 0.9624 and 0.9837, respectively. This result shows a high compatibility between simulation and experiments. The simulations accurately represent the kinetics of the concentration process and the change in temperature and Brix of tomato juice products in the concentration chamber.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83169016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-15DOI: 10.51316/jst.165.etsd.2023.33.2.2
Deproteinized natural rubber/graphene oxide (DPNR/GO) nanocomposite was prepared and characterized in the present work. GO was synthesized by oxidation process via Hummer modified method, and it was characterized with X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), and water contact angle. The presence of hydrophilic functional groups in GO sheet was confirmed by FT-IR, NMR and water contact angle. The characteristic XRD scattering pattern of GO was observed at about 2θ= 9.5° and it confirmed the successful synthesis of GO. The GO was incorporated into DPNR via graft copolymerization using tetraethylenpentamine/tert-butyl hydroperoxide as redox initiators. The DPNR/GO nanocomposites with 0.1, 0.5, and 1.0 phr of GO were fabricated and characterized through FTIR, tensile strength, and scanning electron microscope. The stress at break of DPNR/GO nanocomposite increased when the GO suspension was homogenized before the graft copolymerization. The GO content is found to increase the stress at break for the nanocomposite; however, the hardness of the nanocomposite did not change at high GO loading. The result indicated that the formation of nanocomposite materials between natural rubber and GO was affected by the sheet morphology and hydrophilicity of GO.
{"title":"Preliminary Study on Preparation of Deproteinized Natural Rubber/Graphene Oxide Nanocomposite","authors":"","doi":"10.51316/jst.165.etsd.2023.33.2.2","DOIUrl":"https://doi.org/10.51316/jst.165.etsd.2023.33.2.2","url":null,"abstract":"Deproteinized natural rubber/graphene oxide (DPNR/GO) nanocomposite was prepared and characterized in the present work. GO was synthesized by oxidation process via Hummer modified method, and it was characterized with X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), and water contact angle. The presence of hydrophilic functional groups in GO sheet was confirmed by FT-IR, NMR and water contact angle. The characteristic XRD scattering pattern of GO was observed at about 2θ= 9.5° and it confirmed the successful synthesis of GO. The GO was incorporated into DPNR via graft copolymerization using tetraethylenpentamine/tert-butyl hydroperoxide as redox initiators. The DPNR/GO nanocomposites with 0.1, 0.5, and 1.0 phr of GO were fabricated and characterized through FTIR, tensile strength, and scanning electron microscope. The stress at break of DPNR/GO nanocomposite increased when the GO suspension was homogenized before the graft copolymerization. The GO content is found to increase the stress at break for the nanocomposite; however, the hardness of the nanocomposite did not change at high GO loading. The result indicated that the formation of nanocomposite materials between natural rubber and GO was affected by the sheet morphology and hydrophilicity of GO.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88630038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-15DOI: 10.51316/jst.165.etsd.2023.33.2.4
In the study, the nanostructured V2O5 photocatalyst was prepared by a hydrothermal process followed by calcination with the addition of various surfactants to the precursor solution. The synthesized V2O5 nanomaterials were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and ultraviolet - visible spectroscopy (UV-vis). The SEM images and XRD spectra showed that the V2O5 nanomaterials with different morphologies crystallized in the orthorhombic phase were successfully synthesized. The FTIR spectrum gives characteristic oscillations of the chemical bonds in V2O5, containing the V-O-V vibration. The UV-Vis spectrum determines the band gap energy in accordance with the bandgap energy value of V2O5. In particular, the results demonstrated that the addition of surfactant had a strong effect on the morphology, band gap energy and surface chemistry of the photocatalysts. The comparison between the addition of the three surfactants of dodecyl sulfate sodium, pluronic P123, and CTAB showed that the addition of SDS produced the most efficient V2O5 photocatalyst is beneficial to improve V2O5 agglomeration. Under the illumination of the Compact lamp, the V2O5 product using SDS removal could reach up to 90% Methylene Blue solution after 120 minutes.
{"title":"Hydrothermal Synthesis of Nanostructured V2O5 Material for Photocatalytic Applications: Effect of Surfactants","authors":"","doi":"10.51316/jst.165.etsd.2023.33.2.4","DOIUrl":"https://doi.org/10.51316/jst.165.etsd.2023.33.2.4","url":null,"abstract":"In the study, the nanostructured V2O5 photocatalyst was prepared by a hydrothermal process followed by calcination with the addition of various surfactants to the precursor solution. The synthesized V2O5 nanomaterials were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and ultraviolet - visible spectroscopy (UV-vis). The SEM images and XRD spectra showed that the V2O5 nanomaterials with different morphologies crystallized in the orthorhombic phase were successfully synthesized. The FTIR spectrum gives characteristic oscillations of the chemical bonds in V2O5, containing the V-O-V vibration. The UV-Vis spectrum determines the band gap energy in accordance with the bandgap energy value of V2O5. In particular, the results demonstrated that the addition of surfactant had a strong effect on the morphology, band gap energy and surface chemistry of the photocatalysts. The comparison between the addition of the three surfactants of dodecyl sulfate sodium, pluronic P123, and CTAB showed that the addition of SDS produced the most efficient V2O5 photocatalyst is beneficial to improve V2O5 agglomeration. Under the illumination of the Compact lamp, the V2O5 product using SDS removal could reach up to 90% Methylene Blue solution after 120 minutes.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90542739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-15DOI: 10.51316/jst.165.etsd.2023.33.2.8
The paper shows the influence of the fixed angle of non-circular gears (NCGs) on the gear ratio function characteristics of the compound non-circular gear (CNCG) train. The research established a mathematical model describing the centrodes of a typical CNCG train. The fixed angle β of non-circular gears on the intermediate shaft is changed to evaluate its effect on the gear ratio of the CNCG train. The results show that changing the fixed angle of non-circular gears on the intermediate shaft changes the transfer function law of the system and can increase the speed variation range on the output shaft. With the parameters of the designed CNCG train, changing the angle β can increase the amplitude of the gear ratio function to 30.19%. A CNCG train with a speed variation range from 1.37 to 5.11 has been experimentally designed and manufactured with an improved cycloid profile considering the tooth number distribution and satisfying the condition of avoiding undercutting. On that basis, an experimental system to determine the gear ratio of the CNCG train based on the meshing between the gear pairs in the CNCG train has been designed and manufactured. The experimental results showed that the maximum error of the gear ratio function is about 7.63% compared with theoretical ones. In this study, we have not considered the influence of force and torque on the experimental gear ratio. We can apply the results of this research to transmission systems to obtain a speed variation.
{"title":"Influence of the Fixed Angle of the Non-Circular Gears on the Intermediate Shaft on the Gear Ratio Function Characteristics","authors":"","doi":"10.51316/jst.165.etsd.2023.33.2.8","DOIUrl":"https://doi.org/10.51316/jst.165.etsd.2023.33.2.8","url":null,"abstract":"The paper shows the influence of the fixed angle of non-circular gears (NCGs) on the gear ratio function characteristics of the compound non-circular gear (CNCG) train. The research established a mathematical model describing the centrodes of a typical CNCG train. The fixed angle β of non-circular gears on the intermediate shaft is changed to evaluate its effect on the gear ratio of the CNCG train. The results show that changing the fixed angle of non-circular gears on the intermediate shaft changes the transfer function law of the system and can increase the speed variation range on the output shaft. With the parameters of the designed CNCG train, changing the angle β can increase the amplitude of the gear ratio function to 30.19%. A CNCG train with a speed variation range from 1.37 to 5.11 has been experimentally designed and manufactured with an improved cycloid profile considering the tooth number distribution and satisfying the condition of avoiding undercutting. On that basis, an experimental system to determine the gear ratio of the CNCG train based on the meshing between the gear pairs in the CNCG train has been designed and manufactured. The experimental results showed that the maximum error of the gear ratio function is about 7.63% compared with theoretical ones. In this study, we have not considered the influence of force and torque on the experimental gear ratio. We can apply the results of this research to transmission systems to obtain a speed variation.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85531864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.8
3D printing technology is rapidly developing in the world and Vietnam. 3D printing technology is applied in many fields: architecture, construction, medicine, education, and other manufacturing industries such as consumer goods, automobiles, aircraft, and aerospace. Especially, 3D printing technology has developed quite aggressively in the fashion industry. Many brands have applied this technology to print costumes and jewellery. This advancement in technology has helped designers create diversified and abundant fashion products and reduce time-to-market. In Vietnam today, 3D printing technology has been widely applied in several industries, but in the fashion industry this technology has only been partially applied such as sample design and building three-dimensional human body data; the application of 3D printing technology to print clothes has not been implemented yet due to the unsatisfactory printing materials, unsuitable technology, and printers. In this article, the authors study the experiences of some countries in 3D scanning technology, some suitable 3D materials, and printing technologies to test this technology in costume design and product making.
{"title":"Introduction of 3D Printing Technology for Fashion Design in Vietnam","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.8","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.8","url":null,"abstract":"3D printing technology is rapidly developing in the world and Vietnam. 3D printing technology is applied in many fields: architecture, construction, medicine, education, and other manufacturing industries such as consumer goods, automobiles, aircraft, and aerospace. Especially, 3D printing technology has developed quite aggressively in the fashion industry. Many brands have applied this technology to print costumes and jewellery. This advancement in technology has helped designers create diversified and abundant fashion products and reduce time-to-market. In Vietnam today, 3D printing technology has been widely applied in several industries, but in the fashion industry this technology has only been partially applied such as sample design and building three-dimensional human body data; the application of 3D printing technology to print clothes has not been implemented yet due to the unsatisfactory printing materials, unsuitable technology, and printers. In this article, the authors study the experiences of some countries in 3D scanning technology, some suitable 3D materials, and printing technologies to test this technology in costume design and product making.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86508082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.5
In this study, the first-principle calculations using Density Functional Theory are used to evaluate the mechanical, electronic and transport properties of the NiS2 monolayer structure. The obtained results show that the monolayer structure NiS2 is broken at the tensile strain of 18% in the x direction and 14% in the y direction. The ultimate strengths are 8.0 N/m and 6.45 N/m in the x and y directions, respectively. At the ground state, the band gap is 0.49 eV with the conduction-band minimum (CBM) at the K’-Γ path and the valence-band maximum (VBM) at the Γ point. Under the strain, the energy band structure is changed and tends to become a metallic material. In addition, the effective mass, which is an important parameter related to the charged particle transportability, is also investigated. The effective mass of the electron decreases while that of the hole increases. The carrier mobility of the electron confirmed is more enhanced than that of the hole. Besides, the optical conductivity properties of NiS2 structure confirmed are pretty good. The obtained results indicate the potential of using the mechanical strain to control the electronic, optical conductivity and transport properties of the NiS2 monolayer structure in microelectromechanical and optoelectronic devices.
{"title":"Theoretical Computational of Electronic and Transport Properties and Optical Conductivity of Monolayer NiS2 under Mechanical Strain","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.5","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.5","url":null,"abstract":"In this study, the first-principle calculations using Density Functional Theory are used to evaluate the mechanical, electronic and transport properties of the NiS2 monolayer structure. The obtained results show that the monolayer structure NiS2 is broken at the tensile strain of 18% in the x direction and 14% in the y direction. The ultimate strengths are 8.0 N/m and 6.45 N/m in the x and y directions, respectively. At the ground state, the band gap is 0.49 eV with the conduction-band minimum (CBM) at the K’-Γ path and the valence-band maximum (VBM) at the Γ point. Under the strain, the energy band structure is changed and tends to become a metallic material. In addition, the effective mass, which is an important parameter related to the charged particle transportability, is also investigated. The effective mass of the electron decreases while that of the hole increases. The carrier mobility of the electron confirmed is more enhanced than that of the hole. Besides, the optical conductivity properties of NiS2 structure confirmed are pretty good. The obtained results indicate the potential of using the mechanical strain to control the electronic, optical conductivity and transport properties of the NiS2 monolayer structure in microelectromechanical and optoelectronic devices.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90506058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.3
Solid-state reaction, co-precipitation, and sol-gel procedures were used to synthesize the Sr3Y1.95Ge3O12:0.05Eu3+ (SYGO: Eu3+) garnet structure. The morphological structure and photoluminescence properties of the samples were studied. Phosphors have morphologies and particle sizes that vary depending on the preparation. According to the X-ray diffraction pattern measurement, the sol-gel sample only appeared to exhibit the SYGO: Eu3+ characteristic that it shows the cubic structure belonging to the Ia3d (230) space group. In comparison to the two approaches of co-precipitation and solid-phase reaction, the sol-gel method has a more single-phase structure. Under the excitation wavelength of 395 nm, all produced samples emitted red light, with the greatest emission peak at 612 nm, corresponding to the 5D0→7F2 transition of Eu3+ ions in the SYGO host lattice. The color coordinates of the sample SYGO: Eu3+ fabricated by the sol-gel method are x = 0.65 and y = 0.35. Therefore, the SYGO: Eu3+ based on sol-gel method’s synthesis is a promising phosphor for the application of White LED.
{"title":"Effects of Synthesis Methods on the Characteristics of Material Sr3Y1.95Ge3O12: 0.05Eu3+ (SYGO: Eu3+) for White LED Phosphors Applications","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.3","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.3","url":null,"abstract":"Solid-state reaction, co-precipitation, and sol-gel procedures were used to synthesize the Sr3Y1.95Ge3O12:0.05Eu3+ (SYGO: Eu3+) garnet structure. The morphological structure and photoluminescence properties of the samples were studied. Phosphors have morphologies and particle sizes that vary depending on the preparation. According to the X-ray diffraction pattern measurement, the sol-gel sample only appeared to exhibit the SYGO: Eu3+ characteristic that it shows the cubic structure belonging to the Ia3d (230) space group. In comparison to the two approaches of co-precipitation and solid-phase reaction, the sol-gel method has a more single-phase structure. Under the excitation wavelength of 395 nm, all produced samples emitted red light, with the greatest emission peak at 612 nm, corresponding to the 5D0→7F2 transition of Eu3+ ions in the SYGO host lattice. The color coordinates of the sample SYGO: Eu3+ fabricated by the sol-gel method are x = 0.65 and y = 0.35. Therefore, the SYGO: Eu3+ based on sol-gel method’s synthesis is a promising phosphor for the application of White LED.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75327396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.4
The novel desalination device, the return flow electromembrane desalination called Return Flow Ion-Concentration-Polarization (RF-ICP) which resolved one of the most prominent problems in ICP is the over-limiting conduction mechanism. The development of the ion depletion layer largely determines the energy consumption of electromembrane desalination, because of the increased electrical resistance of the ion-depleted boundary layer which is also a desired outcome for desalination. In this work, we conducted a study on the desalination efficiency of the RF-ICP desalination system for different operations. The transport of ions in the system was examined by using numerical simulation. The Poisson-Nernst-Planck and Navier-Stokes equations were solved numerically to model the transport of ions at different electrical current regimes and the feeding-flow rates. Obtained simulation results showed that the current and current efficiency increases with the feeding-flow rate, the salt removal ratio changes inversely with feeding-flow rate, and the energy per ion remove decreases when increasing the feeding-flow rate. The findings are useful in optimizing the design and operation of the RF-ICP desalination system.
{"title":"Ion Transport in the Return Flow Ion-Concentration-Polarization System","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.4","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.4","url":null,"abstract":"The novel desalination device, the return flow electromembrane desalination called Return Flow Ion-Concentration-Polarization (RF-ICP) which resolved one of the most prominent problems in ICP is the over-limiting conduction mechanism. The development of the ion depletion layer largely determines the energy consumption of electromembrane desalination, because of the increased electrical resistance of the ion-depleted boundary layer which is also a desired outcome for desalination. In this work, we conducted a study on the desalination efficiency of the RF-ICP desalination system for different operations. The transport of ions in the system was examined by using numerical simulation. The Poisson-Nernst-Planck and Navier-Stokes equations were solved numerically to model the transport of ions at different electrical current regimes and the feeding-flow rates. Obtained simulation results showed that the current and current efficiency increases with the feeding-flow rate, the salt removal ratio changes inversely with feeding-flow rate, and the energy per ion remove decreases when increasing the feeding-flow rate. The findings are useful in optimizing the design and operation of the RF-ICP desalination system.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85919530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.6
Depressing the brake when the vehicle is moving downhill for a long time will have a bad effect on the car's brake system. Typically, the phenomenon of friction, wear, and temperature rise occurs at the brake pads. These can be the causes of brake failure. This paper presents the idea of designing and simulating magneto-rheological brake (MRB) model to assist van trucks downhill without interfering with the traditional braking system. Research on brake models using: Magneto-rheological fluid (MRF), a smart material that is gradually being applied in many fields of science and technology. The operation of this type of brake is based on the inherent advantages of MR fluids such as continuously changing dynamic range and fast response, actively changing the viscosity of the fluid when changing the magnetic field applied to the coil. In order to improve safety and initiative in the braking process of the car. The study presents the process of calculating and simulating the braking torque generated from this brake model. Thereby helping to open a new direction for the traditional brake system in cars as well as contributing to the development of the automobile industry in general.
{"title":"Design and Simulation of Magnetorheological Brake Supporting Downhill Van Truck","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.6","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.6","url":null,"abstract":"Depressing the brake when the vehicle is moving downhill for a long time will have a bad effect on the car's brake system. Typically, the phenomenon of friction, wear, and temperature rise occurs at the brake pads. These can be the causes of brake failure. This paper presents the idea of designing and simulating magneto-rheological brake (MRB) model to assist van trucks downhill without interfering with the traditional braking system. Research on brake models using: Magneto-rheological fluid (MRF), a smart material that is gradually being applied in many fields of science and technology. The operation of this type of brake is based on the inherent advantages of MR fluids such as continuously changing dynamic range and fast response, actively changing the viscosity of the fluid when changing the magnetic field applied to the coil. In order to improve safety and initiative in the braking process of the car. The study presents the process of calculating and simulating the braking torque generated from this brake model. Thereby helping to open a new direction for the traditional brake system in cars as well as contributing to the development of the automobile industry in general.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85917285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.51316/jst.164.etsd.2023.33.1.7
The continuing increase in gas turbine inlet temperature requires additional heat transfer at the trailing edge. Therefore, a large amount of research has been carried out to find a highly efficient cooling process for gas turbine blades. Pin-fins have been widely used in the trailing edge of gas turbines to enhance heat transfer performance. Pin-fins also strengthen the structure between the inlet and outlet faces of the gas turbine. According to previous research, the flow structure and heat transfer characteristics are influenced by many parameters of the pin-fin array, especially the pin-fin shape, height, diameter as well as layout. In this study, instead of changing the structure of the pin-fin array, the work focused on the design of protrusion/dimple points on the leading and trailing edges. Numerical simulations using the SST (Shear Stress Transport) turbulence model were performed to investigate the effect of dimple/protrusion concavity on flow structure and heat transfer characteristics in a rotating channel with pin-fin array. The pin-fins are arranged staggered to each other. The results show that when changing the dimple/protrusion concavity on the leading and trailing edges combined with the rotation speed, the heat transfer efficiency changes positively.
{"title":"Effect of Dimples/Protrusion Concavity on Heat Transfer Performance of Rotating Channel","authors":"","doi":"10.51316/jst.164.etsd.2023.33.1.7","DOIUrl":"https://doi.org/10.51316/jst.164.etsd.2023.33.1.7","url":null,"abstract":"The continuing increase in gas turbine inlet temperature requires additional heat transfer at the trailing edge. Therefore, a large amount of research has been carried out to find a highly efficient cooling process for gas turbine blades. Pin-fins have been widely used in the trailing edge of gas turbines to enhance heat transfer performance. Pin-fins also strengthen the structure between the inlet and outlet faces of the gas turbine. According to previous research, the flow structure and heat transfer characteristics are influenced by many parameters of the pin-fin array, especially the pin-fin shape, height, diameter as well as layout. In this study, instead of changing the structure of the pin-fin array, the work focused on the design of protrusion/dimple points on the leading and trailing edges. Numerical simulations using the SST (Shear Stress Transport) turbulence model were performed to investigate the effect of dimple/protrusion concavity on flow structure and heat transfer characteristics in a rotating channel with pin-fin array. The pin-fins are arranged staggered to each other. The results show that when changing the dimple/protrusion concavity on the leading and trailing edges combined with the rotation speed, the heat transfer efficiency changes positively.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78649456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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