Heat and Mass Transfer - Advances in Science and Technology Applications最新文献_第2页

Heat and Mass Transfer in Outward Convex Corrugated Tube Heat Exchangers 外凸波纹管换热器的传热传质

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-04-04 DOI: 10.5772/INTECHOPEN.85494

Huaizhi Han, Bingxi Li, Yaning Zhang, Quan Zhu, Ruitian Yu

{"title":"Heat and Mass Transfer in Outward Convex Corrugated Tube Heat Exchangers","authors":"Huaizhi Han, Bingxi Li, Yaning Zhang, Quan Zhu, Ruitian Yu","doi":"10.5772/INTECHOPEN.85494","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.85494","url":null,"abstract":"Heat and mass transfer in outward convex corrugated tube heat exchangers is of significant importance for the optimization, fabrication, and application of outward convex corrugated tube heat exchangers. This chapter gives a deep investigation of the heat and mass transfer in outward convex corrugated tube heat exchangers. Based on the experimental setup developed, the performances of a novel outward convex corrugated tube heat exchanger are presented. Simulation methods are then used to detail the heat and mass transfer at tube side and shell side of the outward convex corrugated tube heat exchanger, and these include the flow structure, temperature distribution, and turbulence kinetic energy. Heat and mass transfer enhancements of the outward convex corrugated tube heat exchanger are also studied, and they are from tube side, shell side, and overall system aspects. Finally, multi-objective optimization of the outward convex corrugated tube heat exchanger is conducted to obtain the optimal performances through using Response Surface Methodology (RSM) and Non-dominated Sorting Genetic Algorithm (NSGA-II). Main conclusions and future outlook are then briefly stated and summarized. We firmly believe that the contents presented in this chapter can not only enrich the knowledge of heat exchangers but also develop methods for studying heat exchangers.","PeriodicalId":321588,"journal":{"name":"Heat and Mass Transfer - Advances in Science and Technology Applications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129989850","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: 2

Flow and Heat Transfer in Jet Cooling Rolling Bearing 射流冷却滚动轴承的流动与传热

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-04-01 DOI: 10.5772/INTECHOPEN.84702

Wei Wu, Jibin Hu, Shihua Yuan

引用次数: 0

Minimal Dissipation Processes in Irreversible Thermodynamics and Their Applications 不可逆热力学中的最小耗散过程及其应用

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-03-27 DOI: 10.5772/INTECHOPEN.84703

M. A. Zaeva, A. M. Tsirlin

{"title":"Minimal Dissipation Processes in Irreversible Thermodynamics and Their Applications","authors":"M. A. Zaeva, A. M. Tsirlin","doi":"10.5772/INTECHOPEN.84703","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84703","url":null,"abstract":"It is known that the maximum efficiency of conversion of thermal energy into mechanical work or separation work is achieved in reversible processes. If the intensity of the target flux is set, the processes in the thermodynamic system are irreversible. In this case, the role of reversible processes is played by the processes of minimal dissipation. The review presents the derivation of conditions for minimum dissipation in general form and their specification for heat and mass transfer processes with arbitrary dynamics. It is shown how these conditions follow the solution of problems on the optimal organization of two-flux and multiflux heat exchange. The algorithm for the synthesis of heat exchange systems with given water equivalents and the phase state of the flows is described. The form of the region of realizability of systems using thermal energy and the problem of choosing the order of separation of multicomponent mixtures with the minimum specific heat consumption are considered. It is shown that the efficiency of the rectification processes in the marginal productivity mode monotonously depends on the reversible efficiency, which makes it possible to ignore irreversible factors for choosing the order of separation in this mode.","PeriodicalId":321588,"journal":{"name":"Heat and Mass Transfer - Advances in Science and Technology Applications","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116202694","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

Two-Phase Flow Modeling of Cryogenic Loading Operations 低温加载操作的两相流模型

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-03-15 DOI: 10.5772/INTECHOPEN.84662

Ekaterina Ponizovskaya Devine, D. Luchinsky, M. Foygel, V. Hafiychuk, M. Khasin, J. Sass, Barbara Brown

引用次数: 0

Heat and Mass Transfer of Additive Manufacturing Processes for Metals 金属增材制造过程的传热传质

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-03-12 DOI: 10.5772/INTECHOPEN.84889

Zhengying Wei, Jun Du

{"title":"Heat and Mass Transfer of Additive Manufacturing Processes for Metals","authors":"Zhengying Wei, Jun Du","doi":"10.5772/INTECHOPEN.84889","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84889","url":null,"abstract":"Additive manufacturing (AM), a method in which a part is fabricated layer by layer from a digital design package, provides the potential to produce complex components at reduced cost and time. Many techniques (using many different names) have been developed to accomplish this via melting or solid-state joining. However, to date, only a handful can be used to produce metallic parts that fulfill the requirements of industrial applications. The thermal physics and weld pool behaviors in metal AM process have decisive influence on the deposition quality, the microstructure and service performance of the depositions. Accurate analysis and calculation of thermal processes and weld pool behaviors are of great signifi-cance to the metallurgy analysis, stress and deformation analysis, process control and process optimization etc. Numerical modeling is also a necessary way to turn welding from qualitative description and experience-based art into quantitative analysis- and science-based engineering branch. In this chapter, two techniques for producing metal parts are explored, with a focus on the thermal science of metal AM: fluid flow and heat transfer. Selective laser melting (SLM) is the one that is most widely used because it typically has the best resolution. Another is named metal fused-coated additive manufacturing (MFCAM) that is cost competitive and efficient in producing large and middle-complex components in aerospace applications.","PeriodicalId":321588,"journal":{"name":"Heat and Mass Transfer - Advances in Science and Technology Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128667420","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: 4

Advances in Concentrated Solar Power: A Perspective of Heat Transfer 聚光太阳能的研究进展:从传热的角度

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-03-07 DOI: 10.5772/INTECHOPEN.84575

F. Alnaimat, Yasir Rashid

{"title":"Advances in Concentrated Solar Power: A Perspective of Heat Transfer","authors":"F. Alnaimat, Yasir Rashid","doi":"10.5772/INTECHOPEN.84575","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84575","url":null,"abstract":"Solar energy has the potential to reduce the dependence on the dwindling supply of fossil fuels through concentrated solar power (CSP) technology. CSP plants utilize solar thermal energy to produce electrical energy based on different thermodynamic power cycles. Solar collectors, reflectors, receivers, thermal fluid, and turbines are the main components of each CSP plant and involve intensive heat transfer at all stages. This chapter illustrates the thermal characteristics of the main components used in CSP technology. In addition, the solar thermal fluid characteristics and its stable operational ranges are discussed in this chapter. Heat capacity, vapor pressure, volume expansion, density and viscosity of the thermal fluid should not differ significantly at different temperatures during various operation stages because these variations can cause failure in the system, which is designed at the fixed material properties. Currently, CSP technology is associated with a higher cost compared to the electricity generated through gas power plants. Many efforts are made to search for sustainable and inexpensive materials to minimize the cost of CSP. One critical issue faced by CSP technology is the intermittent nature of the sun. Modern CSP plants integrate thermal energy storage (TES) unit to smoothen the power production or to shift the production from peak sunshine hours to peak demand hours.","PeriodicalId":321588,"journal":{"name":"Heat and Mass Transfer - Advances in Science and Technology Applications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116112034","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: 2

Feedback Control of Rayleigh Convection in Viscoelastic Maxwell Fluids 粘弹性麦克斯韦流体中瑞利对流的反馈控制

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-03-07 DOI: 10.5772/INTECHOPEN.84915

I. Pérez-Reyes, C. Alvarez-Herrera, J. Rodríguez-Campos

引用次数: 0

A Numerical Solution Model for the Heat Transfer in Octagonal Billets 八角形钢坯传热的数值求解模型

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-02-08 DOI: 10.5772/INTECHOPEN.84305

Panagiotis Sismanis

{"title":"A Numerical Solution Model for the Heat Transfer in Octagonal Billets","authors":"Panagiotis Sismanis","doi":"10.5772/INTECHOPEN.84305","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84305","url":null,"abstract":"In the quest for high-quality steel products, the need of cast billets with minimum surface and internal defects is of paramount importance. On the other hand, productivity is required to be as high as possible in order to reduce production cost. Different billet shapes have been applied with emphasis upon square, rectangular, and circular cross-sections. It is obvious that the best billet shape that minimizes surface and subsurface defects is the circular one. Nevertheless, this shape creates some problems with respect to handling and safety reasons. One recent attempt is to produce normal octagonal-shaped billets that appear to approach the circular shape albeit easier to handle. In this study, a numerical solution for the heat transfer during solidification in the continuous casting of octagonal billets has been carried out. The developed model deploys an implicit scheme in order to solve the differential equations of heat transfer under the appropriate boundary conditions in a section of an octagonal billet, assuming fully axisymmetric cooling of the bloom. The geometry of the octagonal billet plays an interesting role in the development of the heat transfer analysis. Based upon fundamental principles, a computer program has been developed for this purpose. Consequently, results from the numerical solution are presented and discussed.","PeriodicalId":321588,"journal":{"name":"Heat and Mass Transfer - Advances in Science and Technology Applications","volume":"54 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132939999","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

Bioconvective Linear Stability of Gravitactic Microorganisms 重力微生物的生物对流线性稳定性

Heat and Mass Transfer - Advances in Science and Technology Applications Pub Date : 2019-01-28 DOI: 10.5772/INTECHOPEN.83724

I. Pérez-Reyes, L. Dávalos-Orozco

引用次数: 0