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Three-dimensional numerical study of supercritical pressure effect on heat transfer of cryogenic methane

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航空动力学报 2011年第7期26卷 1480-1487页

作者： ruan Bo MENG Hua School of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China)

A three-dimensional numerical study of the turbulent convective heat transfer of the cryogenic methane flowing inside a square engine cooling channel under supercritical pressures was systematically *** results indicate that increasing the fluid pressure results in enhanced heat transfer of the cryogenic methane under supercritical *** the pseudo-critical temperature under a corresponding supercritical pressure,drastic property variations cause heat transfer deterioration and sharp wall temperature increase at a high wall heat flux of 7MW/m2.A modified Jackson and Hall heat transfer equation,which can be used for supercritical heat transfer calculations of the cryogenic methane,has been successfully established in this paper.

关键词： supercritical heat transfer supercritical pressure regenerative cooling cryogenic methane numerical study

A novel particle tracking algorithm using polar coordinate system similarity

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Acta Mechanica Sinica 2005年第5期21卷 430-435页

作者： Xiaodong ruan Wenfeng Zhao The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

A new algorithm using polar coordinate system similarity （PCSS） for tracking particle in particle tracking velocimetry （PTV） is proposed. The essence of the algorithm is to consider simultaneously the changes of the distance and angle of surrounding particles relative to the object particle. Monte Carlo simulations of a solid body rotational flow and a parallel shearing flow are used to investigate flows measurable by PCSS and the influences of experimental parameters on the implementation of the new algorithm. The results indicate that the PCSS algorithm can be applied to flows subjected to strong rotation and is not sensitive to experimental parameters in comparison with the conventional binary image cross-correlation （BICC） algorithm. Finally, PCSS is applied to images of a real experiment.

关键词： PIV . PTV . Polar coordinate system similarity .Binary image cross-correlation.

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke ruan Xiao-Sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas Hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization

The CalderSn-Zygmund Decomposition and Interpolation on Weighted Hardy Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1967-1978页

作者： Zhuo Ping ruan Department of Mathematics Beijing Normal University Beijing 100875 P. R. China

We apply discrete Littlewood Paley Stein theory, developed by Han and Lu, to establish Calderon Zygmund decompositions and interpolation theorems on weighted Hardy spaces Hp for w C A∞ in both the one-parameter and t... 详细信息

关键词： Calderdn Zygmund decomposition interpolation weighted Hardy spaces discrete Little- wood Paley analysis

INTERFACE DEFORMATION CHARACTERISTICS OF BIMETAL FORMING

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中国有色金属学会会刊：英文版 1998年第1期8卷 35-39页

作者： Peng, Yinghong ruan, Xueyu Shanghai Jiao Tong Univ Shanghai China

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ＩＮＴＥＲＦＡＣＥＤＥＦＯＲＭＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＢＩＭＥＴＡＬＦＯＲＭＩＮＧ①ＰｅｎｇＹｉｎｇｈｏｎｇａｎｄＲｕａｎＸｕｅｙｕＮａｔｉｏｎａｌＤｉｅ＆ＭｏｌｄＣＡＤＥｎｇｉｎｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，Ｓｈａｎｇ...

关键词： bimetal forming interface deformation characteristics frictional element

Unexpected thermal conductivity enhancement in aperiodic superlattices discovered using active machine learning

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npj Computational Materials 2022年第1期8卷 99-105页

作者： Prabudhya Roy Chowdhury Xiulin ruan School of Mechanical Engineering and the Birck Nanotechnology Center Purdue UniversityWest LafayetteIN47907-2088USA

While machine learning(ML)has shown increasing effectiveness in optimizing materials properties under known physics,its application in discovering new physics remains challenging due to its interpolative *** this work,we demonstrate a general-purpose adaptive ML-accelerated search process that can discover unexpected lattice thermal conductivity(κ_(l))enhancement in aperiodic superlattices(SLs)as compared to periodic superlattices,with implications for thermal management of multilayer-based electronic *** use molecular dynamics simulations for high-fidelity calculations ofκ_(l),along with a convolutional neural network(CNN)which can rapidly predictκ_(l)for a large number of *** ensure accurate prediction for the target unknown SLs,we iteratively identify aperiodic SLs with structural features leading to locally enhanced thermal transport and include them as additional training data for the *** identified structures exhibit increased coherent phonon transport owing to the presence of closely spaced interfaces.

关键词： thermal conductivity transport

Robustness of reinforced gradient-type iterative learning control for batch processes with Gaussian noise

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Chinese Journal of Chemical Engineering 2016年第5期24卷 623-629页

作者： Xuan Yang Xiao'e ruan Department of Applied Mathematics School of Mathematics and StatisticsXi'an Jiaotong University

In this paper,a reinforced gradient-type iterative learning control pro file is proposed by making use of system matrices and a proper learning step to improve the tracking performance of batch processes disturbed by external Gaussian white *** robustness is analyzed and the range of the step is speci fied by means of statistical technique and matrix *** with the conventional one,the proposed algorithm is more ef ficient to resist external *** simulations of an injection molding process illustrate that the proposed scheme is feasible and effective.

关键词： Batch process lterative learning control Reinforced gradient Gaussian white noise

Quantitative Characterizations of Bounded Compact Approximation Property by Semi-Fredholm Operators

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Acta Mathematica Sinica,English Series 2023年第6期39卷 1115-1128页

作者： Dong Yang CHEN Ying Bin ruan School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China School of Mathematics and Statistics Fujian Normal UniversityFuzhou 350007P.R.China

Based on a characterization of upper semi-Fredholm operators due to *** and ***,we introduce and investigate a new quantity characterizing upper semi-Fredholm *** quantity and several well-known quantities are used to characterize bounded compact approximation ***,a new quantity characterizing lower semi-Fredholm operators is introduced,investigated and used to characterize the bounded compact approximation property for dual spaces.

关键词： Bounded compact approximation property compact operators upper semi-Fredholm operators lower semi-Fredholm operators

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Electromagnetic-Thermo-Mechanical Coupling Behavior of Cu/Si Layered Thin Plate Under Pulsed Magnetic Field

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Acta Mechanica Solida Sinica 2022年第1期35卷 90-100页

作者： Qicong Li Linli Zhu Haihui ruan Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Semiconductor-based electronic devices usually work under multiphysics fields rendering complex electromagnetic-thermo-mechanical *** this work,we develop a penalty function method based on a finite element analysis to tackle this coupling behavior in a metal/semiconductor bilayer plate-the representative unit of semiconductor antenna,which receives strong and pulsed electromagnetic *** these pulses,eddy current is generated,of which the magnitude varies remarkably from one plate to another due to the difference in electrical *** the concerned system,the metal layer generates much larger current,resulting in the large temperature rise and the nonnegligible Lorentz force,which could lead to delamination and failure of the semiconductor-based electronic *** study provides theoretical guidance for the design and protection of semiconductor-based electronic devices in complex environments.

关键词： Electromagnetic-thermo-mechanical coupling behavior Finite element method Pulse magnetic field Eddy current Delamination