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Search Results: 1 - 10 of 310312 matches for " Q. J. Kang "
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Contact angles in the pseudopotential lattice Boltzmann modeling of wetting
Q. Li,K. H. Luo,Q. J. Kang,Q. Chen
Physics , 2014, DOI: 10.1103/PhysRevE.90.053301
Abstract: In this paper, we aim to investigate the implementation of contact angles in the pseudopotential lattice Boltzmann modeling of wetting at a large density ratio. The pseudopotential lattice Boltzmann model [X. Shan and H. Chen, Phys. Rev. E 49, 2941 (1994)] is a popular mesoscopic model for simulating multiphase flows and interfacial dynamics. In this model, the contact angle is usually realized by a fluid-solid interaction. Two widely used fluid-solid interactions: the density-based interaction and the pseudopotential-based interaction, as well as a modified pseudopotential-based interaction formulated in the present paper, are numerically investigated and compared in terms of the achievable contact angles, the maximum and the minimum densities, and the spurious currents. It is found that the pseudopotential-based interaction works well for simulating small static (liquid) contact angles, however, is unable to reproduce static contact angles close to 180 degrees. Meanwhile, it is found that the proposed modified pseudopotential-based interaction performs better in light of the maximum and the minimum densities and is overall more suitable for simulating large contact angles as compared with the other two types of fluid-solid interactions. Furthermore, the spurious currents are found to be enlarged when the fluid-solid interaction force is introduced. Increasing the kinematic viscosity ratio between the vapor and liquid phases is shown to be capable of reducing the spurious currents caused by the fluid-solid interactions.
Lattice Boltzmann methods for multiphase flow and phase-change heat transfer
Qing Li,K. H. Luo,Q. J. Kang,Y. L. He,Q. Chen,Q. Liu
Physics , 2015, DOI: 10.1016/j.pecs.2015.10.001
Abstract: Over the past few decades, tremendous progress has been made in the development of particle-based discrete simulation methods versus the conventional continuum-based methods. In particular, the lattice Boltzmann (LB) method has evolved from a theoretical novelty to a ubiquitous, versatile and powerful computational methodology for both fundamental research and engineering applications. It is a kinetic-based mesoscopic approach that bridges the microscales and macroscales, which offers distinctive advantages in simulation fidelity and computational efficiency. Applications of the LB method have been found in a wide range of disciplines including physics, chemistry, materials, biomedicine and various branches of engineering. The present work provides a comprehensive review of the LB method for thermofluids and energy applications, focusing on multiphase flows, thermal flows and thermal multiphase flows with phase change. The review first covers the theoretical framework of the LB method, revealing the existing inconsistencies and defects as well as common features of multiphase and thermal LB models. Recent developments in improving the thermodynamic and hydrodynamic consistency, reducing the spurious currents, enhancing the numerical stability, etc., are highlighted. These efforts have put the LB method on a firmer theoretical foundation with enhanced LB models that can achieve larger liquid-gas density ratio, higher Reynolds number and flexible surface tension. Examples of applications are provided in fuel cells and batteries, droplet collision, boiling heat transfer and evaporation, and energy storage. Finally, further developments and future prospect of the LB method are outlined for thermofluids and energy applications.
Lattice Boltzmann modeling of self-propelled Leidenfrost droplets on ratchet surfaces
Q. Li,Q. J. Kang,M. M. Francois,A. J. Hu
Physics , 2015, DOI: 10.1039/C5SM01353D
Abstract: In this paper, the self-propelled motion of Leidenfrost droplets on ratchet surfaces is numerically investigated with a thermal multiphase lattice Boltzmann model with liquid-vapor phase change. The capability of the model for simulating evaporation is validated via the D2 law. Using the model, we first study the performances of Leidenfrost droplets on horizontal ratchet surfaces. It is numerically shown that the motion of self-propelled Leidenfrost droplets on ratchet surfaces is owing to the asymmetry of the ratchets and the vapor flows beneath the droplets. It is found that the Leidenfrost droplets move in the direction toward the slowly inclined side from the ratchet peaks, which agrees with the direction of droplet motion in experiments [Linke et al., Phys. Rev. Lett., 2006, 96, 154502]. Moreover, the influences of the ratchet aspect ratio are investigated. For the considered ratchet surfaces, a critical value of the ratchet aspect ratio is approximately found, which corresponds to the maximum droplet moving velocity. Furthermore, the processes that the Leidenfrost droplets climb uphill on inclined ratchet surfaces are also studied. Numerical results show that the maximum inclination angle at which a Leidenfrost droplet can still climb uphill successfully is affected by the initial radius of the droplet.
AN EXPERIMENTAL STUDY ON THE KINEMATIC HARDENING RULES FOR NONPROPORTIONAL CYCLIC PLASTICITY
Q Gao,XJ Yang,GZ Kang,
Q. Gao
,X.J. Yang and G.Z. Kang

金属学报(英文版) , 1999,
Abstract: An experimental investigation was cawted out of the cyclic saturated kinematic hardening of the solution treatment stainless steel 316L subjected to cyclic loading for seveml strain paths, such as uniaxial cycling, cireulan elliPtic, diamond, rectangular shapes. The evoluting tndectories of back stresses in deviatoric stress space were obtained, and the evolution of back stress mtes during cyclic saturuted loading was analyzed under the assumption that the yield sudece rudius at cyclic saturation is constant and the direction of plastic stmin rute coincides with the one of the out normal vector Of the yield sudece. Some significant results were obtained.
Lattice Boltzmann modeling of boiling heat transfer: The boiling curve and the effects of wettability
Q. Li,Q. J. Kang,M. M. Francois,Y. L. He,K. H. Luo
Physics , 2015, DOI: 10.1016/j.ijheatmasstransfer.2015.01.136
Abstract: A hybrid thermal lattice Boltzmann (LB) model is presented to simulate thermal multiphase flows with phase change based on an improved pseudopotential LB approach [Q. Li, K. H. Luo, and X. J. Li, Phys. Rev. E 87, 053301 (2013)]. The present model does not suffer from the spurious term caused by the forcing-term effect, which was encountered in some previous thermal LB models for liquid-vapor phase change. Using the model, the liquid-vapor boiling process is simulated. The boiling curve together with the three boiling stages (nucleate boiling, transition boiling, and film boiling) is numerically reproduced in the LB community for the first time. The numerical results show that the basic features and the fundamental characteristics of boiling heat transfer are well captured, such as the severe fluctuation of transient heat flux in the transition boiling and the feature that the maximum heat transfer coefficient lies at a lower wall superheat than that of the maximum heat flux. Furthermore, the effects of the heating surface wettability on boiling heat transfer are investigated. It is found that an increase in contact angle promotes the onset of boiling but reduces the critical heat flux, and makes the boiling process enter into the film boiling regime at a lower wall superheat, which is consistent with the findings from experimental studies.
A Candid Assessment of the Link between Oral Candida Containing Biofilms and Oral Cancer  [PDF]
J. Kang, Y. He, D. Hetzl, H. Q. Jiang, M. K. Jun, M. S. Jun, M. Khng, N. Cirillo, M. J. McCullough
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.62012
Abstract: An association between Candida and oral cancer has long been discussed in the literature and in particular Candida albicans has been proposed to play a significant role in the development of oral cancer. Although this organism is a common member of the oral mucosa and can cause a variety of oral mucosal lesions, the exact mechanisms by which C. albicans potentially causes the development of malignant disease still require much research. We have undertaken an extensive literature search to understand pathogenicity of C. albicans, including its virulence factors, its interactions with the host immune, how a dysregulation of the immune response can result in malignancy, and how a potential C. albicans specific cytokine response may be involved in oral carcinogenesis. We present here a candid assessment of the role of Candida in oral carcinogenesis and a hypothetical model about how this may occur. Finally, we present potential future research which is necessary to elucidate this role.
Genetic diversity of Iris lactea var. chinensis germplasm detected by inter-simple sequence repeat (ISSR)
K Wang, J Kang, H Zhou, Y Sun, Q Yang, J Dong, L Meng
African Journal of Biotechnology , 2009,
Abstract: The genetic diversity of 24 Iris lactea var. chinensis were analysed by using 100 ISSR primers of which only 11 primers generated distinct amplified products. Among the 24 materials, a total of 214 bands were detected, of which 170 bands were polymorphic. The percentage of polymorphic bands (PPB) was 79%. The ISSR-based genetic similarity (GS) values among 24 accessions ranged from 0.400 to 0.929. Abundant genetic diversity among I. lactea var. chinensis accessions was revealed by ISSR markers. Based on the UPGMA cluster analysis and principal components analysis (PCA), the 24 materials investigated were divided into four groups, most of genetic variation was within a group. Genetic distance was found to be related to geographic distance among I. lactea var. chinensis.
THE STRAIN CYCLIC CHARACTERISTICS AND RATCHETING OF U71Mn RAIL STEEL UNDER UNIAXIAL LOADING
GZ Kang,Q Gao,XJYang,YF Sun,
G.Z. Kang
,Q. Gao,X.J.Yang and Y.F. Sun

金属学报(英文版) , 2000,
Abstract: An experimental study was carried out of the cyclic behavior of U71Mn rail steel subjected to uniaxial strain and stress. The effects of cyclic struin amplitude, mean struin,strain loading rate and their histories on the strain cyclic characteristics were studied.Under the asymmetrical stress cycling, the effects of stress amplitude, mean stress,stress loading rate and their histories on the ratcheting were analyzed. The interaction between strain cycling and stress cycling was also discussed. It is shown that either the cyclic characteristics under strain cycling or the ratcheting under asymmetrical stress cycling depends not only on the cumnt loading state, but also on the previous loading history. Some significant results are obtained.
VISCO-PLASTIC CONSTITUTIVE MODEL FOR UNIAXIAL AND MULTIAXIAL RATCHETING AT ELEVATED TEMPERATURES
GZKang,QGao,JZhang,
G.Z.Kang
,Q.Gao,J.Zhang

金属学报(英文版) , 2004,
Abstract: Based on the experimental results of the ratcheting for SS304 stainless steel, a new visco-plastic cyclic constitutive model was established to describe the uniaxial and multiaxial ratcheting of the material at room and elevated temperatures within the framework of unified visco-plasticity. In the model, the temperature dependence of the ratcheting was emphasized, and the dynamic strain aging occurred in the temperature range of 400-600℃ for the material was taken into account particularly. Finally, the prediction capability of the developed model was checked by comparing to the corresponding experimental results.
^THE FRACTURE CHARACTERISTICS OF δ-Al_2O_3/Al ALLOY COMPOSITES
G.Z. Kang,Q. Gao,C. Yang and J.X. Zhang
金属学报(英文版) , 1999,
Abstract: 1.IntroductionThefracturemechanismanalysisofshortfiberreinf0rcedmetalmatrixc0mp0sites(SFRMMCs)isaveryimp0rtantaspectinthemicrthstructuralstudy0fthec0mpositemechanicalperformances.Generally,therearethreekinds0fthefailuremodesinshortfiberreinforcedmetalmatrixc0mpositesll]:(1)Thet0ughfractUrecausedbyinitiating,growingandc0alescingofthev0idsinthematrix0fcomposite;(2)Thebrittlefracture0fthefibers;(3)Thedebondingoftheinterfacebetweenfiberandmatrix.Inagivenc0mposite,thesefailurem0desmaytakeplaces…
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