Journal of Advanced Research in Numerical Heat Transfer最新文献_第2页

Comparison Study Between Galerkin Finite Element Method and Finite Volume Method for Diffusion Problem 针对扩散问题的 Galerkin 有限元方法与有限体积法对比研究

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2024-01-21 DOI: 10.37934/arnht.15.1.2442

Wah Yen Tey, Yutaka Asako, Keng Yinn Wong

{"title":"Comparison Study Between Galerkin Finite Element Method and Finite Volume Method for Diffusion Problem","authors":"Wah Yen Tey, Yutaka Asako, Keng Yinn Wong","doi":"10.37934/arnht.15.1.2442","DOIUrl":"https://doi.org/10.37934/arnht.15.1.2442","url":null,"abstract":"The finite element method (FEM) is a robust and widely applied numerical scheme in the simulation of engineering problems, especially in structural mechanics. However, FEM is not as popular as the finite volume method (FVM) in Computational Fluid Dynamics (CFD), possibly due to its complicated numerical procedures. Indeed, FEM possesses tremendous advantages compared with FVM, particularly in dealing with complex geometry and rendering attractive flexibility to modify the interpolation functions. It is well-known that FEM and FVM differ in mathematical formulation, yet there is a lack of practical comparison between them. Therefore, the paper aims to develop a Galerkin FEM (GFEM) model, investigate its strengths and weaknesses compared with FVM, and discuss the conciliation between FEM and FVM. Our case study focuses on a two-dimensional diffusion problem comprising steady and transient cases, with and without heat generation. Our investigation revealed that GFEM does not possess conservative properties, which might yield spurious heat flux, leading to a 2 – 4% overestimation of the temperature field, depending on the amount of heat generation. Moreover, GFEM incurs approximately 34% higher computational time than FVM. However, FVM can be perceived as a special form of GFEM, and their relations were discussed.","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139610234","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 Investigation on Thermal Performance of Various Designs Plate-Fin Heat Sinks Subject to Parallel and Impinging Flow 平行流和冲击流作用下不同设计板翅片散热器热性能的数值研究

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.6680

Muhammad Zarif Bin Shaharudin, Syahar Shawal, Mazwan Mahat, Mohd Rosdzimin Abdul Rahman

{"title":"Numerical Investigation on Thermal Performance of Various Designs Plate-Fin Heat Sinks Subject to Parallel and Impinging Flow","authors":"Muhammad Zarif Bin Shaharudin, Syahar Shawal, Mazwan Mahat, Mohd Rosdzimin Abdul Rahman","doi":"10.37934/arnht.13.1.6680","DOIUrl":"https://doi.org/10.37934/arnht.13.1.6680","url":null,"abstract":"The electronic industry has been working for decades to improve the cooling efficiency of heat sinks by creating more advanced, efficient cooling technologies. However, heat dissipation remains the major problem in this highly competitive sector. Plate-fin heat sinks with and without fillet profiles were investigated and two new proposed designs for plate-fin heat sinks with half-round pins attached to the fin were developed in this study. Numerical analysis was performed using ANSYS FLUENT R21 to evaluate the thermal performance of the proposed designs. For the element optimization, the grid independency test analysis was performed to obtain the optimal number of elements. A constant heat flux of 18750 W/m2 was applied at the bottom plate of heat sinks as the input parameter and two different flow directions e.g., impinging flow and parallel flow at various mass flow rate was also applied to study the base temperature, thermal resistance and Nusselt number of these designs. The study has shown that plate-fin heat sinks with fillet profile and corrugated half-round pins (PFHS 4) subject to parallel flow and plate-fin heat sinks with fillet profile and symmetrical half-round pins (PFHS 3) subject to impinging flow exhibit better thermal performance over other configurations. Hence, these design configurations have a potential to be applied in the future","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126183362","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

Comparison of Air Flow Distribution in the Building for Different Position of Air Return 不同回风位置下建筑物内气流分布的比较

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.8186

Fatimah Yusop, M. M. Syafiq Syazwan, Nik Normunira Mat Hassan, K. A. Mohd Sari, M. A. A. Rahman, Nuramidah Hamidon, Faridahanim Ahmad, Mohd Kamrulzaman Musa

引用次数: 0

Lattice Boltzmann Computation of Steady Cross-Flow Across a Rectangular Obstacle with Different Aspect Ratio: Effect of Blockage Ratio 不同宽高比矩形障碍物定常横流的格子玻尔兹曼计算:堵塞比的影响

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.117

Krunal Gangawane

引用次数: 0

Laminar Mixed Convection Heat Transfer Analysis in Horizontal Annuli using Hybrid Nanofluid 基于混合纳米流体的水平环空层流混合对流换热分析

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.5265

Riyadh Fayez Sughayyir AlYasi, Nazrul Islam, Radi Abdulmonem alsulami, Badr Ali Bzya Albeshri

{"title":"Laminar Mixed Convection Heat Transfer Analysis in Horizontal Annuli using Hybrid Nanofluid","authors":"Riyadh Fayez Sughayyir AlYasi, Nazrul Islam, Radi Abdulmonem alsulami, Badr Ali Bzya Albeshri","doi":"10.37934/arnht.13.1.5265","DOIUrl":"https://doi.org/10.37934/arnht.13.1.5265","url":null,"abstract":"Heat transfer can be augmented by employing different methodologies and techniques, such as increasing either the heat transfer surface or the heat transfer coefficient between fluid and surface that allows high heat transfer rates in a small volume. The enhanced thermal behavior of nanofluids could supply a basis for a huge innovation in heat transfer intensification. Recently, a new type of nanofluid, known as hybrid nanofluid, which consists of a mixture of two different nanoparticles suspended in the base fluid like water. The present study deals with the analysis of laminar mixed convection heat transfer in horizontal annuli using hybrid nanofluid with the thermal boundary condition of constant heat flux at the inner wall and isothermal outer wall. The SIMPLER numerical algorithm is adopted in the present study. The hybrid nanofluid consists of water as base fluid and Ag-TiO2 as nanoparticles. The ratio of Ag to TiO2 is maintained as 1:3. Main objective of the present study is to compute numerically three-dimensional axis-symmetric, incompressible, steady, laminar flow through annular ducts to investigate the effect of the hybrid nanofluid Ag-TiO2/water on thermal-hydrodynamic characteristics. The analysis reveals that secondary flow due to the buoyancy forces plays an important role in augmenting heat transfer. The development of axial flow and temperature field are strongly found to be influenced by buoyancy. Nusselt number near the entrance region is found to be maximum, then attains a minimum value at a location slightly away from the entrance, and then starts increasing slowly due to the increased buoyancy effects. Finally, the flow becomes almost stable and a nearly constant value of Nusselt number is observed as the flow approaches fully development situation. At a given axial location Nusselt number was found to increase with increasing volumetric concentration of nanoparticle. The effect of Gr Radius ratio on the Nusselt number was also studied","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125891348","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

A Proposed Seaplane Float in Water Entry Problem and Landing in Waves using Particle Based Method 一种基于粒子法的水上飞机水上浮子进入问题及波浪降落方法

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.3138

D. B. Eskayudha, Kenji Yamamoto, Taiga Kanehira, Takuji Nakashima, Hidemi Mutsuda

{"title":"A Proposed Seaplane Float in Water Entry Problem and Landing in Waves using Particle Based Method","authors":"D. B. Eskayudha, Kenji Yamamoto, Taiga Kanehira, Takuji Nakashima, Hidemi Mutsuda","doi":"10.37934/arnht.13.1.3138","DOIUrl":"https://doi.org/10.37934/arnht.13.1.3138","url":null,"abstract":"Seaplane is the newly transportation mode which is developed in the Indonesian Archipelago Region. Originally, the seaplane is equipped by pair of the floats in function to withstand the aircraft load and maintain the seaplane on the water stably. One of the critical moments in the seaplane operation is in the landing phase in waves. The failure in the float performance can be led into severe conditions, even the capsize. In this paper, the aims are to determine the water impact characteristics and response of the proposed seaplane float by implementing the water entry case, calm water landing, and when landing in the periodic waves condition. The numerical model was developed using DualSPHysics based on Smoothed Particle Hydrodynamic to obtain more realistic and accurate prediction of the pressure, velocity fields, and water spray motion with droplets in complex shape of the float. According to numerical results and reproducible experimental data in this study, the 2D water entry and 3D calm and waves water problem were applied to reproduce the detailed characteristics of the interaction between the proposed seaplane float and the water surface with splashing. The paper showed that the developed model could be a useful tool to design the seaplane float for Indonesian seaplane in the future","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130641665","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

Modelling of the Flame Synthesis of Single-walled Carbon Nanotubes in Non-premixed Flames with Aerosol Catalyst 气溶胶催化剂非预混火焰中单壁碳纳米管火焰合成的模拟

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.3951

Muhammad Syafiq Ridhwan Selamat, Muhammad Thalhah Zainal, Mohd Fairus Mohd Yasin, Norikhwan Hamzah, Nor azwadi Che Sidik

{"title":"Modelling of the Flame Synthesis of Single-walled Carbon Nanotubes in Non-premixed Flames with Aerosol Catalyst","authors":"Muhammad Syafiq Ridhwan Selamat, Muhammad Thalhah Zainal, Mohd Fairus Mohd Yasin, Norikhwan Hamzah, Nor azwadi Che Sidik","doi":"10.37934/arnht.13.1.3951","DOIUrl":"https://doi.org/10.37934/arnht.13.1.3951","url":null,"abstract":"The use of aerosol catalyst in the flame synthesis of carbon nanotube (CNT) is known to yield single-walled CNT (SWCNT) that is useful for various applications. Modelling works are needed to optimize operating conditions for SWCNT growth but are unavailable. Therefore, a baseline model for the aerosol-catalyst system in flames is developed and the effect of oxygen on SWCNT growth is investigated. A baseline flame model for a normal diffusion flame with 24% oxygen concentration at the inlet is established via Computational Fluid Dynamic simulation. A dispersed phase model (DPM) is employed to simulate the entrainment of catalyst particles. The flame model is coupled with a published CNT growth rate model to predict the CNT growth rate at each particle. Inlet oxygen concentration is varied from 19% to 27% to study the effect of oxygen on SWCNT growth. Satisfactory validation of the baseline flame shape and temperature is established. Results show that particle 3 for the baseline case yields the highest CNT length compared to other particles due to the suitable path for the synthesis. The particles are classified based on the shortest time residence, moderate and longest time residence. Increasing oxygen concentration from 19% to 27% results in a 30% decrease in CNT length for particle 3 for each inlet condition due to lower carbon precursor and composition in the flame. Furthermore, the results showed that regardless of burner operating conditions, high SWCNT growth is consistently predicted between 120-140 mm HAB, which indicates the existence of an optimum range of species concentration for SWCNT growth in aerosol-based flame synthesis. Thus, it can be inferred that SWCNT growth in the aerosol–based method is highly dependent on carbon source and moderately dependent on temperature","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126475131","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 Analysis of Battery Thermal Management System of Electric Vehicle 电动汽车电池热管理系统数值分析

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.106114

Lai Qit Inn, A. N. Oumer, Azizuddin Abd Aziz, Januar Parlaungan Siregar, Tezara Cionita

{"title":"Numerical Analysis of Battery Thermal Management System of Electric Vehicle","authors":"Lai Qit Inn, A. N. Oumer, Azizuddin Abd Aziz, Januar Parlaungan Siregar, Tezara Cionita","doi":"10.37934/arnht.13.1.106114","DOIUrl":"https://doi.org/10.37934/arnht.13.1.106114","url":null,"abstract":"This study is modelling the direct liquid cooling system of battery used in Electric Vehicle. The purpose of the study is to investigate the performance of the Li-ion battery model under different input of parameters and to evaluate the optimum parameters for the battery thermal management system model to maintain at its peak performance. SolidWorks and ANSYS are used to model and simulate the battery whereas MINITAB software is selected for conducting the statistical analysis. Heat flux, mass flow rate at the inlet and the thickness of the battery model has been selected as input of the simulation. The obtained results show that the heat transfer coefficient is increasing with the higher heat flux and mass flowrate but decreasing with the thickness of the battery model. Pressure drop remains constant when heat flux varies but increasing with mass flow rate and inversely proportional with the thickness of battery. For statistical analysis, an optimum value for the parameters is proposed to maintain the battery to operate with a highest heat transfer coefficient but lowest in pressure difference. Overall, the study has been conducted successfully and fulfilled the objectives stated.","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121779591","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

Dispersion of Solute in Casson Fluid through a Stenosed Artery with the Effect of Body Acceleration 卡森液中溶质通过狭窄动脉的分散与身体加速度的影响

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.8795

Nuur Atikah Elias, Nurul Aini Jaafar, Intan Diyana Munir, Sharidan Shafie

引用次数: 0

Evaluation of Virus Concentration Analysis in the Airway by CFD 基于CFD的气道病毒浓度分析的评价

Journal of Advanced Research in Numerical Heat Transfer Pub Date : 2023-07-19 DOI: 10.37934/arnht.13.1.96105

Yoshiki Yanagita, Kaishan Feng, Yuko Miyamura, Adi Azriff Basri, Mohammad Zuber, Siti Rohani, Abdul Aziz, Kamarul Arifin Ahmad, Masaaki Tamagawa

{"title":"Evaluation of Virus Concentration Analysis in the Airway by CFD","authors":"Yoshiki Yanagita, Kaishan Feng, Yuko Miyamura, Adi Azriff Basri, Mohammad Zuber, Siti Rohani, Abdul Aziz, Kamarul Arifin Ahmad, Masaaki Tamagawa","doi":"10.37934/arnht.13.1.96105","DOIUrl":"https://doi.org/10.37934/arnht.13.1.96105","url":null,"abstract":"Currently, Covid-19 is an epidemic all over the world. When virus directly adhere to mucous membrane of airway by breath, some humans maybe get inflammatory responses by viruses in the first stage of infection. The airway is composed of the nasal cavity, sinuses (Maxillary Sinus, Ethmoid Sinus, Frontal Sinus and Sphenoidal Sinus) and lungs. In the infection stage, the sinuses located in the nasal cavity tend to exhibit particularly high virus concentrations. Therefore, it is important to evaluate quantitatively the areas where viruses are likely to be adhered in the nasal cavity including sinuses. In this study, by CFD including concentration analysis the areas where viruses are likely to be adhered in the nasal cavity are predicted. As for the methods, the nasal cavity was made from 2D-CT image data by Itk-SNAP. For this computation in the nasal cavity continuity equation, Navier-Stokes equation and transport equation are used. And the transport of concentration was computed in the divided 4 parts of nasal cavity. As a result, it was found that the ratio of the concentration to the initial concentration in Ethmoid Sinus is approximately 0.6. It was found that Ethmoid Sinus is the areas where viruses are likely to be adhered and the areas can be predicted by computing the concentration.","PeriodicalId":119773,"journal":{"name":"Journal of Advanced Research in Numerical Heat Transfer","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129679704","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