Journal of Advanced Research in Numerical Heat Transfer最新文献

Analytical Solution for MHD Casson Nanofluid Flow and Heat Transfer due to Stretching Sheet in Porous Medium 多孔介质中拉伸片引起的 MHD 卡森纳米流体流动与传热的解析解

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-05-04 DOI: 10.37934/arnht.19.1.4359

W. N. N. Noranuar, A. Q. Mohamad, Lim Yeou, Jiann, S. Shafie, M. A. Jamaludin, Ahmad Qushairi

{"title":"Analytical Solution for MHD Casson Nanofluid Flow and Heat Transfer due to Stretching Sheet in Porous Medium","authors":"W. N. N. Noranuar, A. Q. Mohamad, Lim Yeou, Jiann, S. Shafie, M. A. Jamaludin, Ahmad Qushairi","doi":"10.37934/arnht.19.1.4359","DOIUrl":"https://doi.org/10.37934/arnht.19.1.4359","url":null,"abstract":"The feature of having a surface that can stretch has garnered attention in numerous industrial and engineering fields because of its advantages. Nevertheless, most fluid mechanics simulations for stretchable surfaces have predominantly relied on numerical solutions, with a notable lack of theoretical investigations into this matter. Consequently, the current research aims to contribute a theoretical exploration of heat transfer and boundary layer flow for Casson nanofluid on a linearly stretching sheet, considering the existence of porosity and magnetic field effects. Two distinct types of water-based nanofluids containing aluminium oxide and silicon dioxide are examined. By employing similarity transformations, the governing momentum and energy equations undergo transformation and subsequent analytical resolution using Laplace transformations. The resulting solutions are graphically presented to examine the influence of key parameters on temperature and velocity distribution. The analysis indicates that heat transfer is improved by the inclusion of nanoparticles, porosity, and a magnetic field. However, the velocity distribution slows down as a result of higher nanoparticle volume fraction, porosity, and magnetic field imposition.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"134 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013577","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}

引用次数: 0

Water Vapor Movement on Mass and Heat Transport in the Perspective of Water Vapor Buoyancy: A Review 水蒸气浮力视角下的水蒸气运动对质量和热量传输的影响：综述

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-05-04 DOI: 10.37934/arnht.19.1.1528

Khairul Ikhwan Mohd Jamalludin, Sunny Goh Eng Giap, Mohammad Fadhli Ahmad, Hanhan Maulana, Senny Luckyardi

{"title":"Water Vapor Movement on Mass and Heat Transport in the Perspective of Water Vapor Buoyancy: A Review","authors":"Khairul Ikhwan Mohd Jamalludin, Sunny Goh Eng Giap, Mohammad Fadhli Ahmad, Hanhan Maulana, Senny Luckyardi","doi":"10.37934/arnht.19.1.1528","DOIUrl":"https://doi.org/10.37934/arnht.19.1.1528","url":null,"abstract":"In 1957, the governing equation of mass and heat transport in the soil or porous media was popularised, now commonly referred to as PdV theory. This governing equation helps to quantify and simulate the water, vapor and heat in porous media. But at the same time, due to the fundamental uncertainty parameter in the equation, it was continuously updated. The equation predicting vapor flux movement in the soil has been the subject of many investigations. The vapor enhancement factor (VEF) was introduced to overcome the issue. When VEF was introduced, a few researchers were able to quantify the factor, but could not provide the guiding mechanism representing the observation. In the latest review from a literature study, we found a new form of equation to improve the VEF. It comes from the basis of the universal gas law, which describes the volume expansion from liquid water to vapor, and also the vapor buoyancy. This study aims to review water vapor movement and vapor buoyancy phenomenon. Also, to identify the parameters of the equations that contribute to the vapor buoyancy effect. The water vapor movement should not be neglected in the governing equation because its contribution to the overall mass movement is significant. Vapor buoyancy is possible to become a mechanism out from VEF. The parameters that contribute to vapor buoyancy effect are gravity, soil temperature, vapor density and water salinity. Clearly, understanding vapor buoyancy effect helps us better predict the distribution of soil temperature and soil moisture content.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"28 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141014411","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}

引用次数: 0

Mathematical Solutions of Free Convection Flow of Casson Fluid in Channel with Accelerated Plate 带加速板的通道中卡松流体自由对流的数学解法

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-05-04 DOI: 10.37934/arnht.19.1.6075

Mohamad Riduan, Z. Ismail, A. Q. Mohamad, Nurul Nabilah Hassan, W. N. N. Noranuar, L. Y. Jiann, S. Shafie, D. Vieru

{"title":"Mathematical Solutions of Free Convection Flow of Casson Fluid in Channel with Accelerated Plate","authors":"Mohamad Riduan, Z. Ismail, A. Q. Mohamad, Nurul Nabilah Hassan, W. N. N. Noranuar, L. Y. Jiann, S. Shafie, D. Vieru","doi":"10.37934/arnht.19.1.6075","DOIUrl":"https://doi.org/10.37934/arnht.19.1.6075","url":null,"abstract":"This research develops mathematical solutions for Casson fluid flow with free convective phenomena within channels with an accelerated plate. The study transforms the governing energy and momentum equations into the dimensionless form using appropriate variables. The Laplace transformation is used to acquire analytical solutions. Dimensionless parameters, such as the Prandtl number, Grashof number, accelerated parameter, and Casson fluid parameter, are determined, which are further investigated for their impacts on the flow and thermal behaviour. Visual representations of the mathematical results for velocity and temperature are presented using MATHCAD software through graphical plots. The study observes that fluid velocity increases with higher values of Gr but decreases with increased Pr. Additionally, temperature profiles exhibit a decrease with higher Prandtl numbers and an increase with time. The obtained results are validated by comparing them with published results in limiting cases, showing good agreement, and confirming the accuracy and reliability of the research outcomes.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"98 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013500","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}

引用次数: 0

Exploration Of Key Approaches to Enhance Evacuated Tube Solar Collector Efficiency 探索提高蒸发管太阳能集热器效率的关键方法

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-05-04 DOI: 10.37934/arnht.19.1.114

Yasir Al-Abayechi, Yaser Alaiwi, Zainab Al-Khafaji

{"title":"Exploration Of Key Approaches to Enhance Evacuated Tube Solar Collector Efficiency","authors":"Yasir Al-Abayechi, Yaser Alaiwi, Zainab Al-Khafaji","doi":"10.37934/arnht.19.1.114","DOIUrl":"https://doi.org/10.37934/arnht.19.1.114","url":null,"abstract":"This research is carried out to investigate and examine the critical benefits and significant contributions of integrating nanoparticles into the ETSC system to enhance the thermal efficiency, thermal performance, temperature out, and energy storage of the ETSC. The Simcenter STAR-CCM+ 2022.1 software package implemented numerical analysis and thermal simulations. Further, a comparative analysis is conducted on two case studies to validate the critical role and contributions of employing the aluminum oxide nanomaterial in the solar collector system to enhance its thermal efficiency and improve its thermal performance and heat transfer, including (1) conventional ETSC and (2) ETSC with Al2O3. According to the numerical analysis and comparative study findings, the results of this research revealed that employing and adding the aluminum oxide nanomaterial into the ETSC system had contributed to several beneficial impacts and significant advantages. In addition, using Al2O3 achieved enhancements in the thermal efficiency, increases in the outlet collector’s temperature, improvements in the rate of heat flux of the pipes, the tube inside the collector, heat transfer of the hot water storage tank, and a rise in the temperature gradient the hot water temperature increased from (between 44.3 and 74.8 ºC) to (between 49.6-80.3 ºC). Besides, the velocity of the water flow inside the solar collector in the second case in which the aluminum oxide nanoparticles are used was higher due to the absorption of further solar radiation and thermal energy, which resulted in a considerable increase in the kinetic energy of water molecules from 0.01 to 0.07 m/s. Also, it was found that the velocity directions and profile were slightly more turbulent in the second case than the conventional solar collector due to more thermal energy absorbed and stored in the ETSC from solar radiation.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"199 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013440","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}

引用次数: 0

Numerical Simulation on the Spray Angle of the Dual-layer Hole Nozzle in a Partition Combustion System of the Diesel Engine 柴油机分区燃烧系统中双层孔喷嘴喷雾角度的数值模拟

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-05-04 DOI: 10.37934/arnht.19.1.2942

Lu Hongkun, Muhamad Mat Noor, Li Li, Kumaran Kadirgama

{"title":"Numerical Simulation on the Spray Angle of the Dual-layer Hole Nozzle in a Partition Combustion System of the Diesel Engine","authors":"Lu Hongkun, Muhamad Mat Noor, Li Li, Kumaran Kadirgama","doi":"10.37934/arnht.19.1.2942","DOIUrl":"https://doi.org/10.37934/arnht.19.1.2942","url":null,"abstract":"To study the effect of the spray angles of the dual-layer hole nozzle on the combustion and emissions performance in the partition combustion system, the in-cylinder spray, mixture formation and combustion processes of the new combustion system were simulated and investigated using AVL FIRE software. The results show that, compared with the variation of the lower-layer spray angles, the change of the upper-layer spray angles has a great influence on the instantaneous heat release rate. The increasing spray angles of the lower-layer holes lead to reduced peak values of the heat release rate in the cylinder. In all the spray angle cases, the first fire area of the cylinder is in the B zone of the combustion chamber. Compared with lower-layer spray angle, the upper-layer spray angle has a greater impact on the airflow disturbance in the combustion chamber. Appropriately increasing the upper-layer spray angle facilitates the mixing of fuel and air in the combustion chamber and reduces the unburnt fuel equivalence ratio. When the spray angles of the upper- and lower-layer holes are 157° and 112°, respectively, the combustion indicates power has the largest value of 12.18 kW. At the same time, the Soot emission is also the smallest, with a value of 0.52 g/kW·h.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"139 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013122","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}

引用次数: 0

Significant Effect of Radiation on Combined Convection Vertical Channel with Internal Heat Generation and Boundary Conditions of a Third Kind 辐射对带有内部发热和第三类边界条件的联合对流垂直通道的显著影响

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-04-01 DOI: 10.37934/arnht.18.1.1429

Nur Asiah Mohd Makhatar, Nur Farina Saadun, Noor Azlin Natasha Mohd Zakaria, Dimas Avian Maulana, Amirah Sahar, Izzati Khalidah Khalid

{"title":"Significant Effect of Radiation on Combined Convection Vertical Channel with Internal Heat Generation and Boundary Conditions of a Third Kind","authors":"Nur Asiah Mohd Makhatar, Nur Farina Saadun, Noor Azlin Natasha Mohd Zakaria, Dimas Avian Maulana, Amirah Sahar, Izzati Khalidah Khalid","doi":"10.37934/arnht.18.1.1429","DOIUrl":"https://doi.org/10.37934/arnht.18.1.1429","url":null,"abstract":"Heat transfer process involving combined convection, along with the influence of radiation, within a fully developed vertical channel, holds significant importance in environmental, industrial, and engineering applications. Concerns have arisen regarding the complexity, cost, and time required to understand the heat transfer process, especially when considering radiation effects. This study aims to assess the combined impact of the Robin temperature boundary condition and radiation on flow and heat transfer, to examine the role of viscous dissipation, including its interaction with radiation, in fluid flow and heat transfer and to compare the heat transfer effectiveness under the boundary conditions of Dirichlet, Neumann, and Robin. Various dimensional parameters are systematically tested in this investigation, with particular emphasis on discussing the phenomenon of flow reversal in the presence of radiation. The numerical solution to the Boundary Value Problem (BVP) is achieved using Maple and its built-in routine, dsolve. A validation study on a previously published problem is conducted to ensure the accuracy of the computational approach, considering the added complexity of radiation effects and the transformation of the partial differential equation into an ordinary differential equation applying the similarity technique. Graphical representations of the numerical results for flow and temperature profiles, incorporating radiation effects, are presented. Notably, the occurrence of flow reversal is observed in instances where the values of internal heat generation (G), combined convection parameter (λ), and radiation effects (Rd) were substantial. Conversely, an increase in the values of the local heating exponent (p) and Biot numbers (Bi), while accounting for radiation, eliminated the occurrence of flow reversal.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"419 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140776360","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}

引用次数: 0

Thermal State Effects on Potential Augmentation of the Ampacity of a Medium Voltage Underground Cable in Power Distribution: A Case Study 热状态对配电领域中压地下电缆潜在增容能力的影响：案例研究

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-04-01 DOI: 10.37934/arnht.18.1.113

Beriache M’hamed, Koubili Sid Ali, Mokhtar Saïdia Leila, Nor Azwadi Che Sidik, Wan Mohd Arif Aziz Japar, Ahmad Tajuddin Mohamad

{"title":"Thermal State Effects on Potential Augmentation of the Ampacity of a Medium Voltage Underground Cable in Power Distribution: A Case Study","authors":"Beriache M’hamed, Koubili Sid Ali, Mokhtar Saïdia Leila, Nor Azwadi Che Sidik, Wan Mohd Arif Aziz Japar, Ahmad Tajuddin Mohamad","doi":"10.37934/arnht.18.1.113","DOIUrl":"https://doi.org/10.37934/arnht.18.1.113","url":null,"abstract":"This research aims at a deeper understanding of the steady-state thermal behavior of underground cables using Computational Heat Transfer (CHT) techniques modeling based Ansys Fluent software. The results concern the thermal study of 33 kV single and multiple copper conductors with a nominal conductor cross-section of 615 mm2 buried in the ground for a single cable, two cables and for three cables in horizontal position. The most unfavorable summer conditions, the burial depth as well as the physical properties of the soil as a function of the moisture content, are studied. The operating current of the conductors is taken 940 A. The results show that the temperature of the cables decreases with the burial depth, a compromise temperature/cost of installation corresponds to 80 cm of burial depth. Further, the maximum temperature of a single cable buried in the ground is considerably lower than that allowed (363 K) for a good use, namely 313 K in summer conditions, so there is a considerable margin to increase its ampacity, also the temperature decrease with increase of water content of the soil surrounding the cable of approximately 2 to 5 degrees. The results obtained are in good agreement with those of the literature.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"304 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140756781","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}

引用次数: 0

Aligned Magnetohydrodynamics and Thermal Radiation Effects on Ternary Hybrid Nanofluids Over Vertical Plate with Nanoparticles Shape Containing Gyrotactic Microorganisms 三元混合纳米流体上的对准磁流体力学和热辐射效应与纳米颗粒形状包含陀螺仪微生物的垂直板

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-04-01 DOI: 10.37934/arnht.18.1.6891

Siti Shuhada Ishak, Mohd Rijal Ilias, Seripah Awang Kechil, Fazillah Bosli

{"title":"Aligned Magnetohydrodynamics and Thermal Radiation Effects on Ternary Hybrid Nanofluids Over Vertical Plate with Nanoparticles Shape Containing Gyrotactic Microorganisms","authors":"Siti Shuhada Ishak, Mohd Rijal Ilias, Seripah Awang Kechil, Fazillah Bosli","doi":"10.37934/arnht.18.1.6891","DOIUrl":"https://doi.org/10.37934/arnht.18.1.6891","url":null,"abstract":"Nowadays, challenges in development of heat transfer for various engineering fields including heat exchangers, electronics, chemical and bio-industry and others are crucial. Ternary hybrid nanofluids (THNF) as a new heat transfer liquids can be considered as effective medium for increment of heat and energy transport. In the case of THNF when three nanoparticles are added in the based fluid to enhance the transport processes. Dissimilar to the nanofluids (NF) and hybrid nanofluids (HNF) model that considers two types of nanoparticles, this studied consider the three types of nanoparticles in this work which are Aluminium Oxide (AI2O3), Copper (Cu), and Carbon Nanotube (CNT) with different shapes containing gyrotactic microorganisms. The objective is to find the effect of magnetohydrodynamics (MHD) and radiation to the steady of THNF flow past the vertical plate. The mathematical model has been formulated based on a combination Tiwari-Das and Buongiorno nanofluids model. The governing flow and heat transfer equations are simplified to the ordinary differential equations (ODEs) with the adaptation of conventional similarity transformations which are then evaluated by the bvp4c solver (MATLAB) to generate the numerical solutions. The solutions are visually represented through graphs and table to be easily observed. The results indicated that the effect of magnetic field parameter decrease the velocity and contrary in concentration, and microorganism profile while the temperature is increased in magnetic but contrary in radiation parameter . The concentration and density microorganism of THNF is increase with higher value in and but decrease in velocity and temperature. The spherical nanoparticle shape has a higher density, causing the skin friction of THNF to be lower compared to NF and HNF.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"18 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140768288","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}

引用次数: 0

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines 计算流体动力学 (CFD) 验证和研究活塞缸几何形状对端口燃油喷射-均质充气压缩点火 (PFI-HCCI) 发动机性能的影响

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-04-01 DOI: 10.37934/arnht.18.1.3048

Nik Muhammad Hafiz Nik Ab Rashid, Abdul Aziz Hairuddin, Khairil Anas Md Rezali, Siti Ujila Masuri, Al Anbagi Muntasser Abdulabbas Mossa, Jamiluddin Jaafar, Deni Fajar Fitriyana

{"title":"Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines","authors":"Nik Muhammad Hafiz Nik Ab Rashid, Abdul Aziz Hairuddin, Khairil Anas Md Rezali, Siti Ujila Masuri, Al Anbagi Muntasser Abdulabbas Mossa, Jamiluddin Jaafar, Deni Fajar Fitriyana","doi":"10.37934/arnht.18.1.3048","DOIUrl":"https://doi.org/10.37934/arnht.18.1.3048","url":null,"abstract":"Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. Nevertheless, the operation of HCCI engines still presents formidable challenges. Preparing homogeneous mixtures and controlling the combustion phase are crucial challenges in the context of engine performance. Piston bowl geometry significantly enhances the process by improving the flow and facilitating air-fuel mixing for combustion. On that note, this study utilised the CFD simulation methods to analyse HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston bowl geometries on engine performance. For this purpose, the CFD simulation result for a single-cylinder, four-stroke YANMAR diesel engine was validated with experimental data. The different piston bowl geometries with the same volume, compression, and equivalence ratio were then investigated numerically. The validation result of the CFD simulation offers enough confidence to continue the study with different piston bowl geometries. The results attained from the Direct Injection (DI) engine piston bowl application demonstrate a minor change in in-cylinder pressure and heat release rate. The piston bowl design employed in a Port Fuel Injection engine application exhibited different combustion phases while demonstrating similarity in attaining in-cylinder pressure. The findings for swirl induce piston bowl design indicate an enhancement of in-cylinder pressure for the Spiral Crown geometry model, reaching 9.42 MPa. The results of the study demonstrated that the piston bowl's design affected the performance of an HCCI engine.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"1168 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140774682","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}

引用次数: 0

CFD Analysis of Indoor Ventilation for Airborne Virus Infection 空气传播病毒感染的室内通风CFD分析

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-10-11 DOI: 10.37934/arnht.14.1.116

None Kaishan Feng, None Yoshiki Yanagita, None Yuko Miyamura, None Adi Azriff Basri, None Mohammad Zuber, None Siti Rohani, None Kamarul Arifin Ahmad, None Masaaki Tamagawa

{"title":"CFD Analysis of Indoor Ventilation for Airborne Virus Infection","authors":"None Kaishan Feng, None Yoshiki Yanagita, None Yuko Miyamura, None Adi Azriff Basri, None Mohammad Zuber, None Siti Rohani, None Kamarul Arifin Ahmad, None Masaaki Tamagawa","doi":"10.37934/arnht.14.1.116","DOIUrl":"https://doi.org/10.37934/arnht.14.1.116","url":null,"abstract":"CFD Analysis of Indoor Ventilation for Airborne Virus Infection Indoor airflow patterns and air residence times significantly influence the spread of airborne infectious viruses, such as COVID-19. These factors can be quantified using computational fluid dynamics (CFD). In this study, CFD was utilized to assess the indoor airflow patterns and calculate air residence times in a typical restroom with high personnel flow and low ventilation efficiency. The results identified regions with high air residence times, indicating potential risk areas for airborne virus retention. Furthermore, the effects of different ventilation strategies on these high-risk areas were analyzed. Despite meeting air change standards, certain regions were found to potentially pose a higher risk due to prolonged air residence times. Based on these findings, recommendations for improving ventilation systems to reduce the risk of airborne virus infection were proposed. This study highlights the necessity of a more nuanced approach to indoor air assessment than simply calculating air changes per hour. It was concluded that (1) different ventilation strategies can greatly affect the air residence time in the room and (2) the variance of air residence time in the air circulation area are large in some locations, even with simple ventilation adjustments.","PeriodicalId":497716,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136253504","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}

引用次数: 0