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A new heat transfer correlation for supercritical fluids

Yanhua YANG, Xu CHENG, Shanfang HUANG

Frontiers in Energy 2009, Volume 3, Issue 2, Pages 226-232 doi: 10.1007/s11708-009-0022-0

Abstract: A new method of heat transfer prediction in supercritical fluids is presented. Emphasis is put on the simplicity of the correlation structure and its explicit coupling with physical phenomena. Assessment of qualitative behaviour of heat transfer is conducted based on existing test data and experience gathered from open literature. Based on phenomenological analysis and test data evaluation, a single dimensionless number, the acceleration number, is introduced to correct the deviation of heat transfer from its conventional behaviour, which is predicted by the Dittus-Boelter equation. The new correlation structure excludes direct dependence of heat transfer coefficient on wall surface temperature and eliminates possible numerical convergence. The uncertainty analysis of test data provides information about the sources and the levels of uncertainties of various parameters and is highly required for the selection of both the dimensionless parameters implemented into the heat transfer correlation and the test data for the development and validation of new correlations. Comparison of various heat transfer correlations with the selected test data shows that the new correlation agrees better with the test data than other correlations selected from the open literature.

Keywords： super critical fluids heat transfer circular tubes prediction method

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High-efficiency inspecting method for mobile robots based on task planning for heat transfer tubes in

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0741-z

Abstract: Many heat transfer tubes are distributed on the tube plates of a steam generator that requires periodicSince there are thousands of tubes to be checked, task planning is essential to guarantee the preciseMost in-service robots check the task tubes using row-by-row and column-by-column planning.

Keywords： steam generator transfer tubes mobile robot dexterous structure task planning efficient inspection

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Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1317-1336 doi: 10.1007/s11709-021-0763-3

Abstract: Based on an experimental program on tension performance of three square concrete-filled tubes (SCFT),

Keywords： square concrete filled tubes confine-stiffening confine-strengthening fractal cracking fracture

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LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Zhengxia DOU

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1, Pages 188-192 doi: 10.15302/J-FASE-2020370

Abstract: animal-derived food is slowing while attention is growing over the role of livestock farming in an enhanced circular

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Civil and structural engineering applications, recent trends, research and developments on pultruded fiber reinforced polymer closed sections: a review

Alfred Kofi GAND, Tak-Ming CHAN, James Toby MOTTRAM

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3, Pages 227-244 doi: 10.1007/s11709-013-0216-8

Abstract: The objectives of this study are to review and evaluate the developments and applications of pultruded fiber-reinforced polymer composites in civil and structural engineering and review advances in research and developments. Several case applications are reviewed. The paper presents a state-of-the-art review of fundamental research on the behavior of pultruded fiber reinforced polymer closed sections and highlights gaps in knowledge and areas of potential further research.

Keywords： reinforced polymer composites behaviour of FRPs tubular sections pultruded FRP tubular profiles FRP tubesin bridges applications of pultruded FRP tubes new-build with FRP tubes

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LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract: animal-derived food is slowing while attention is growing over the role of livestock farming in an enhanced circular

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New technique of precision necking for long tubes with variable wall thickness

Yongqiang GUO, Chunguo XU, Jingtao HAN, Zhengyu WANG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4, Pages 622-630 doi: 10.1007/s11465-019-0565-7

Abstract: This study analyzed the deformation law of rear axles with variable wall thickness under bidirectional horizontal extrusion and found that necking was accompanied by upsetting deformation through theoretical calculation, numerical simulation, and experimental research. The sequence and occurrence of necking and upsetting deformations were obtained. A theory of deformation was proposed by controlling the distribution of temperature field. Effective processes to control the wall thickness of rear axle at different positions were also proposed. The ultimate limit deformation with a necking coefficient of 0.68 could be achieved using the temperature gradient coefficient. A new technology of two-step heating and two-step extrusion for a 13 t rear axle was developed, qualified test samples were obtained, and suggestions for further industrial application were put forward.

Keywords： extrusion rear axle necking coefficient temperature gradient

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Circular economy：ideas and innovation

Jin Yong,Feng Zhijun,Chen Dingjiang

Strategic Study of CAE 2010, Volume 12, Issue 1, Pages 4-11

Abstract: "text-align: justify;">It has been over a decade since China paid close attention to the concept of circularDuring this period the country made promoting circular economy as one of the basic national developmentimportant ideas and theories, which could be used as general guidelines for innovation to boost the circular

Keywords： circular economy circular economics

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Frequencies of circular plate with concentric ring and elastic edge support

Lokavarapu Bhaskara RAO,Chellapilla Kameswara RAO

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2, Pages 168-176 doi: 10.1007/s11465-014-0299-5

Abstract:

Exact solutions for the flexural vibrations of circular plates having elastic edge conditions alongValues of frequency parameter for the considered circular plate are computed for different sets of valuesrotational and linear restraints and the radius of the rigid ring support on the vibration behavior of circular

Keywords： circular plate frequency elastic edge rigid ring mode switching

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Numerical analysis of hydrodynamic process of circular-translational-moving polishing (CTMP)

ZHAI Wenjie, LIU Changxiong, LIANG Yingchun

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 441-448 doi: 10.1007/s11465-008-0074-6

Abstract: By keeping a pad moving relative to a wafer along a circular path without rotation, we developed a polishingtechnique called circular-translational-moving polishing (CTMP), which permits multidirectional polishing

Keywords： numerical analysis practical CTMP circular-translational-moving polishing CTMP different

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A new method for boring of non-circular holes

ZHANG Kai, HU De-jin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4, Pages 456-460 doi: 10.1007/s11465-006-0058-3

Abstract: composed of an electromagnetic stator and an electromagnetic rotor has been developed for boring non-circular

Keywords： electromagnetic actuation control method displacement flexible body revolving electromagnetic

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Numerical simulation on flow of ice slurry in horizontal straight tube

Shengchun LIU,Ming SONG,Ling HAO,Pengxiao WANG

Frontiers in Energy 2021, Volume 15, Issue 1, Pages 201-207 doi: 10.1007/s11708-017-0451-0

Abstract: Numerical simulation on flow of ice slurry in horizontal straight tubes was conducted in this paper toThis paper determined the influence of the diameter and length of tubes, the ice packing factors (IPF

Keywords： ice slurry horizontal tubes numerical simulation pressure drop viscosity model

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Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid

Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3, Pages 291-297 doi: 10.1007/s11465-013-0255-9

Abstract:

This work presents the existence of buckling mode switching with respect to the radius of concentric rigid ring support. The buckling mode may not be axisymmetric as previously assumed. In general, the plate may buckle in an axisymmetric mode but when the radius of the ring support becomes small, the plate may buckle in an asymmetric mode. The optimum radius of the concentric rigid ring support for maximum buckling load is also determined. Introducing internal rigid ring support, when placed at an optimal position increases the elastic buckling load capacity by 149.39 percent. The numerical results obtained are in good agreement with the previously published data.

Keywords： buckling circular plate elastically restrained edge rigid ring support mode switching

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Surface accuracy optimization of mechanical parts with multiple circular holes for additive manufacturing

Jinghua XU, Hongsheng SHENG, Shuyou ZHANG, Jianrong TAN, Jinlian DENG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1, Pages 133-150 doi: 10.1007/s11465-020-0610-6

Abstract: Circular hole, especially spatial non-planar hole set is the typical feature and working surface of mechanicalmachining methods, additive manufacturing (AM) technology can decrease the surface accuracy errors of circularHowever, an accuracy error may still exist on the surface of circular holes fabricated by AM due to theThis study proposes a surface accuracy optimization approach for mechanical parts with multiple circularThird, the corresponding weights of the circular holes are calculated with the TFN analytic hierarchy

Keywords： surface accuracy optimization multiple circular holes additive manufacturing (AM) part build orientation

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Carbon performance evaluation model from the perspective of circular economy—The case of Chinese thermal

Zhifang ZHOU, Jinhao LIU, Huixiang ZENG, Mengmeng XU, Shihui LI

Frontiers of Engineering Management 2022, Volume 9, Issue 2, Pages 297-311 doi: 10.1007/s42524-020-0143-z

Abstract: carbon resource (energy) input, cycle, output, and carbon management by incorporating the principles of circular

Keywords： circular economy carbon performance comprehensive evaluation thermal power enterprise

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Title Author Date Type Operation

A new heat transfer correlation for supercritical fluids

Yanhua YANG, Xu CHENG, Shanfang HUANG

Journal Article

High-efficiency inspecting method for mobile robots based on task planning for heat transfer tubes in

Journal Article

Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes

Journal Article

LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Zhengxia DOU

Journal Article

Civil and structural engineering applications, recent trends, research and developments on pultruded fiber reinforced polymer closed sections: a review

Alfred Kofi GAND, Tak-Ming CHAN, James Toby MOTTRAM

Journal Article

LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Journal Article

New technique of precision necking for long tubes with variable wall thickness

Yongqiang GUO, Chunguo XU, Jingtao HAN, Zhengyu WANG

Journal Article

Circular economy：ideas and innovation

Jin Yong,Feng Zhijun,Chen Dingjiang

Journal Article

Frequencies of circular plate with concentric ring and elastic edge support

Lokavarapu Bhaskara RAO,Chellapilla Kameswara RAO