Diffusion Foundations and Materials Applications最新文献_第4页

CFD Simulation of the Hydrodynamics of Core-Annular Flow of Oil, Gas and Water in Elliptic-Cylindrical Duct 椭圆-圆柱形管道中油气水岩心-环空流动的CFD模拟

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-cwlmxa

J. L. de Oliveira, H. L. F. Magalhães, R. S. Gomez, Daniel César M. Cavalcante, Guilherme Luiz Oliveira Neto, Nívea Gomes Nascimento de Oliveira, F. Batista, R. Silva, A. K. Abreu, Arthur G.F. Almeida, A. G. B. de Lima

{"title":"CFD Simulation of the Hydrodynamics of Core-Annular Flow of Oil, Gas and Water in Elliptic-Cylindrical Duct","authors":"J. L. de Oliveira, H. L. F. Magalhães, R. S. Gomez, Daniel César M. Cavalcante, Guilherme Luiz Oliveira Neto, Nívea Gomes Nascimento de Oliveira, F. Batista, R. Silva, A. K. Abreu, Arthur G.F. Almeida, A. G. B. de Lima","doi":"10.4028/p-cwlmxa","DOIUrl":"https://doi.org/10.4028/p-cwlmxa","url":null,"abstract":"Heavy oils, due to their high viscosity, have greater viscous resistance to flow, requiring high pumping power for transport and increasing operating cost. As an alternative to minimize this problem, the core-flow technique emerged, which consists of injecting water simultaneously with the oil flow, causing the heavy oil to be surrounded by a layer of water and flowing in the center of the duct without touching the pipe wall, consequently reducing the friction pressure gradient. Thus, this work aims to numerically study the core-annular flow of oil, water and gas in a cylindrical duct with an elliptical cross-section, considering a three-dimensional, isothermal and incompressible flow. For the numerical solution of the governing equations, the software Ansys FLUENT 15.0 was used. It was found that the lubrication provided by the water on the duct wall reduced the pressure variation by 7.20 times compared to the heavy oil single-phase flow, proving the good efficiency of the core-flow technique.","PeriodicalId":262023,"journal":{"name":"Diffusion Foundations and Materials Applications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122875990","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 Studies in the Drying of Industrial Clay Brick: The Effect of the Airflow Direction 工业粘土砖干燥过程的计算流体力学研究:气流方向的影响

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-j1eci6

Morgana V Araújo, A. C. Sousa, M. R. Luiz, Adriano S. Cabral, T. R. B. Pessoa, P. C. Martins, A.M. Vasconcelos da Silva, R. S. Santos, V. B. de Oliveira, A. G. B. de Lima

{"title":"Computational Fluid Dynamics Studies in the Drying of Industrial Clay Brick: The Effect of the Airflow Direction","authors":"Morgana V Araújo, A. C. Sousa, M. R. Luiz, Adriano S. Cabral, T. R. B. Pessoa, P. C. Martins, A.M. Vasconcelos da Silva, R. S. Santos, V. B. de Oliveira, A. G. B. de Lima","doi":"10.4028/p-j1eci6","DOIUrl":"https://doi.org/10.4028/p-j1eci6","url":null,"abstract":"The manufacture of ceramic brick goes through the stages of raw material extraction, clay homogenization, material conformation, drying and firing. Drying is the phase that needs greater care, as it involves removing part of the moisture from the brick, in order to preserve its quality after process. This work aims to predict heat and mass transfer in the drying of ceramic bricks in oven using computational fluid dynamics. Considering the constant thermophysical properties, a transient three-dimensional mathematical model was used to predict mass and energy transfer between the material and air during the process. Drying simulations at temperature of 100°C were performed with the air flow in the frontal direction to the ceramic brick holes and the results were compared with those obtained for the air flow in the perpendicular direction to the brick holes reported in the literature. It was found that the position of the brick in relation to the direction of air flow inside the oven affected directly the drying and heating kinetics, and the distribution of temperature and moisture content inside the brick. The positioning of the holes in the brick parallel to the direction of the air flow resulted in reduction at the drying time and, consequently, in energy savings in the process, more uniform drying, and improvement in the product quality.","PeriodicalId":262023,"journal":{"name":"Diffusion Foundations and Materials Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128916027","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: 1

Moisture Diffusion in Passion Fruit Seeds under Infrared Drying 红外干燥条件下百香果种子水分扩散研究

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-w52h5b

Ageu S. Batista, Marcos F.F. Souza, Manoel Marcelo Prado

引用次数: 2

Impact of the Polarization Layer on the Hydrodynamics and Mechanical Performance of a Filtering Hydrocyclone Applied to Oily Water Separation 极化层对油水分离过滤式旋流器流体力学和力学性能的影响

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-lt7945

Sirlene A Nunes, H. L. F. Magalhães, R. S. Gomez, Daniel César M. Cavalcante, Guilherme Luiz Oliveira Neto, Nívea Gomes Nascimento de Oliveira, S. Neto, A. S. Pereira, A. K. Abreu, Arthur G.F. Almeida

{"title":"Impact of the Polarization Layer on the Hydrodynamics and Mechanical Performance of a Filtering Hydrocyclone Applied to Oily Water Separation","authors":"Sirlene A Nunes, H. L. F. Magalhães, R. S. Gomez, Daniel César M. Cavalcante, Guilherme Luiz Oliveira Neto, Nívea Gomes Nascimento de Oliveira, S. Neto, A. S. Pereira, A. K. Abreu, Arthur G.F. Almeida","doi":"10.4028/p-lt7945","DOIUrl":"https://doi.org/10.4028/p-lt7945","url":null,"abstract":"The growing concern with the environment has driven the development of new technologies for the treatment of produced water. In this context, the filtering hydrocyclone appears as an interesting alternative for the treatment of these waters contaminated with oil from the petroleum industry. This research addresses the flow of fluids inside a hydrocyclone equipped with a porous wall (membrane) containing two tangential inlets and two concentric outlets, with the aim of study the impact of the formation of the polarization layer by concentration on the oily water separation process using CFD. Concentration fields and transmembrane pressure, concentration, and permeate flux profiles are presented and analyzed. The results show that the proposed filtering cyclonic separator concentrates the oil in the central region of the equipment, however, for high oil concentrations; the core expands and approaches the porous wall. Furthermore, the increase in the oil volume fraction causes a decline in the permeate flux, and an increase in feed velocity causes a decrease in the polarization layer.","PeriodicalId":262023,"journal":{"name":"Diffusion Foundations and Materials Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128093332","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

Impact of Heated Air Indirectly Produced by Photovoltaic Panels on Indoor Thermal Comfort 光伏板间接产生热空气对室内热舒适的影响

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-7vvp8v

A.C.C. Oliveira, L. Rodrigues, A. S. Guimarães, J. Delgado

{"title":"Impact of Heated Air Indirectly Produced by Photovoltaic Panels on Indoor Thermal Comfort","authors":"A.C.C. Oliveira, L. Rodrigues, A. S. Guimarães, J. Delgado","doi":"10.4028/p-7vvp8v","DOIUrl":"https://doi.org/10.4028/p-7vvp8v","url":null,"abstract":"Climate change is one of the most debated issues today around the world, given its global impact. The construction industry in the European Union (EU) accounts for 40% of energy consumption and 36% of greenhouse gas emissions. Thus, the continuous improvement of energy efficiency in buildings plays a key role in achieving the carbon neutrality goal by 2050. At a time when the irreversible point of global warming may have already been reached, change becomes urgent, with one of the solutions being the use of renewable energies. Among renewable energies, solar is considered not only one of the most promising ones but also one of the energies with the greatest potential growth. The accelerated use of solar PV allows a reduction of carbon dioxide of approximately 4.9 gigatonnes. In the last decades, solar panels presented a great improvement in their efficiency and power output over and, in addition to the production of electricity, their heat can also be harnessed. Therefore, the objective of this work is to study a photovoltaic panel solution in which the heat produced indirectly by it contribution to the heating of a house and, consequently, to thermal comfort. In this work, it was analysed the feasibility of a PV solution that intends to take advantage of the hot air, indirectly produced by it, for subsequent heating of a house. Numerical simulations were performed using Ansys® Fluent, Release 18.1, software and considering a 3D model of a house with PV panels installed in the roof. The results showed the solution under study is not feasible in winter, since solar radiation is not enough for heating using this contribution. However, this solution, although not avoiding the use of other heating means, can help in heating, contributing to the reduction of some needs.","PeriodicalId":262023,"journal":{"name":"Diffusion Foundations and Materials Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123594195","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

Heat Transfer and Fluid Flow in Concentric Annular Ducts Using the Galerkin-Based Integral Method: A Numerical Study 基于伽辽金积分法的同心环形管道传热与流体流动数值研究

Diffusion Foundations and Materials Applications Pub Date : 2022-08-19 DOI: 10.4028/p-oxd8cb

Valdecir A.S. Júnior, S. Neto, A. G. B. de Lima

引用次数: 0