Author
Lijun Yang
Other affiliations: Tsinghua University, Chinese Ministry of Education
Bio: Lijun Yang is an academic researcher from North China Electric Power University. The author has contributed to research in topics: Water cooling & Heat transfer. The author has an hindex of 30, co-authored 183 publications receiving 3195 citations. Previous affiliations of Lijun Yang include Tsinghua University & Chinese Ministry of Education.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a shell-and-tube latent heat thermal storage unit was designed to investigate the dynamic thermal behavior of a PCM, and the thermal properties, including that of melting temperature and latent heat, were detected by Differential Scanning Calorimetry.
159 citations
TL;DR: In this paper, the energy conservation equation with a moving Gaussian energy source is developed, in which the temperature-dependent thermal physical properties of materials are taken into account, and the effects of the linear energy density, volume shrinkage, scanning track length, hatch spacing and time interval between two neighboring tracks on the temperature distribution and molten pool dimensions are analyzed.
150 citations
TL;DR: In this paper, a transient mathematical model was established to examine the influences of varying porosity on the thermal characteristic, considering natural convection and Brinkman-Forchheimer extension to the Darcy law.
142 citations
TL;DR: In this paper, the performance of a typical indirect dry cooling system with heat exchanger bundles outside, the computational models of air-side fluid and heat flows coupled with the performances of the circulating water and exhaust steam are developed.
103 citations
TL;DR: In this paper, the physical and mathematical models of the air-side fluid and heat flows at various wind speeds and in various wind directions were developed to investigate the impacts of ambient winds on the thermo-flow performances of indirect dry cooling system.
81 citations
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Journal Article•
TL;DR: In this article, a fast Fourier transform method of topography and interferometry is proposed to discriminate between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour generation techniques.
Abstract: A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.
3,742 citations
TL;DR: In this paper, a review of recent developments and future perspectives in carbon dioxide usage for sustainable production of energy and chemicals and to reduce global warming is presented, focusing on the design of metal electrodes to improve their performance and recent developments of alternative approaches such as the application of ionic liquids as electrolytes and microorganisms as co-catalysts.
Abstract: This review highlights recent developments and future perspectives in carbon dioxide usage for the sustainable production of energy and chemicals and to reduce global warming. We discuss the heterogeneously catalysed hydrogenation, as well as the photocatalytic and electrocatalytic conversion of CO2 to hydrocarbons or oxygenates. Various sources of hydrogen are also reviewed in terms of their CO2 neutrality. Technologies have been developed for large-scale CO2 hydrogenation to methanol or methane. Their industrial application is, however, limited by the high price of renewable hydrogen and the availability of large-volume sources of pure CO2. With regard to the direct electrocatalytic reduction of CO2 to value-added chemicals, substantial advances in electrodes, electrolyte, and reactor design are still required to permit the development of commercial processes. Therefore, in this review particular attention is paid to (i) the design of metal electrodes to improve their performance and (ii) recent developments of alternative approaches such as the application of ionic liquids as electrolytes and of microorganisms as co-catalysts. The most significant improvements both in catalyst and reactor design are needed for the photocatalytic functionalisation of CO2 to become a viable technology that can help in the usage of CO2 as a feedstock for the production of energy and chemicals. Apart from technological aspects and catalytic performance, we also discuss fundamental strategies for the rational design of materials for effective transformations of CO2 to value-added chemicals with the help of H2, electricity and/or light.
1,368 citations
TL;DR: Composite Photocatalysts Nan Zhang,‚‡ Min-Quan Yang,†,‡ Siqi Liu,*,‡ Yugang Sun,* and Yi-Jun Xu*,† are authors of this paper.
Abstract: Composite Photocatalysts Nan Zhang,†,‡ Min-Quan Yang,†,‡ Siqi Liu,†,‡ Yugang Sun,* and Yi-Jun Xu*,†,‡ †State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China ‡College of Chemistry, New Campus, Fuzhou University, Fuzhou 350108, P.R. China Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
997 citations
TL;DR: This review focuses on the advances of IRT as a non-contact and non-invasive condition monitoring tool for machineries, equipment and processes.
697 citations