Comment on “Correlation of entrainment for annular flow in horizontal pipes”, by Pan,L., Hanratty,T.J., Int. J. Multiphase flow, 28(3), (2002), pp. 385–408

The above referenced paper, published in International Journal of Multiphase Flow (Pan and Hanratty, 2002), proposed an entrainment fraction correlation for annular flow in horizontal pipes. The entrainment fraction in annular flow is defined as the ratio of the mass flow rate of the liquid droplets in the gas to the total mass flow of liquid, F_E = W_LE/W_L. The proposed correlation was verified with experimental data for liquids with viscosities close to that of water. The proposed entrainment fraction correlation includes another correlation for the critical film flow rate, W_F,cr to estimate a maximum entrainment fraction F_E,max. It is shown that the critical film flow rate correlation can result in negative maximum entrainment fraction values, for low liquid flow rates.     

Handbook of Fluidization,Mooson Kwauk,Hongzhong Li （Eds.）.

Fluidization is an important process technology and is ubiquitously present in the process industry. The phenomena of fluidization also represent one of the most fascinating fluid-particle interactive behaviors in nature that are manifested by complex, intertwining science and engineering principles. Even though it is a centuries old practice, pursuit of the fundamental understanding of fluidization has its origins in the 1940s. Since the 1960s, fluidization has been a vibrant field for fluid mechanics, particle mechanics, as well as modeling and computation. From the historical perspective, Professor Mooson Kwauk and Professor Richard Wilhelm＇s 1948 article ＂Fluidization of Solid Particles,＂ is proved to be a pioneering work that sets a stage for subsequent fundamental studies in the characteristics of fluidization. As the field has evolved over the last six decades, Professor Kwauk has been a leader of fluidization research in China and the world,     

Ronald J. DiPerna 1947–1989

In memoriam

Ronald J. DiPerna 1947–1989     

Reprint of “Size dependence and orientation dependence of elastic properties of ZnO nanofilms” [In. J. Solids Struct. 45 (2008) 1730–1753]

The elastic properties of ZnO nanofilms with different film thickness, surface orientations and loading directions are investigated by using molecular mechanics (MM) method. The size dependence of elastic properties is relevant to both the film surface crystallographic orientation and loading direction. Both atomic structure analysis and energy calculation are employed to identify the mechanisms of the size-dependent elastic properties, under different loading directions and surface orientations. Upon small axial deformation, the relationship between intralayer and interlayer bond length variation and film elastic stiffness is established; it is found that the atomic layers with larger bond length variation have higher elastic stiffness. The strain energies of atomic layers of ZnO nanofilm and bulk are decoupled, from which the stiffness of film surface, intralayers, and interlayers are derived and compared with their bulk counterparts. The surface stiffness is found to be much lower than that of the interior layers and bulk counterpart, and with the decrease of film thickness, the residual tension-stiffened interior atomic layers are the main contributions of the increased elastic modulus of ZnO nanofilms.     

西德摩擦学专家巴尔茨(Bartz,W.J.)教授来我国访问

应中国机械工程学会摩擦学学会的邀请,西德埃斯林根技术学院教授巴尔茨博士于1981年8月20日来我国访问。在访问期间,于8月25日和9月4日先后到兰州和西安两地参观了工厂、学校和科研单位,並进行了数次有关摩擦学方面的专题报告和座谈讨论。参加听讲和座谈的有来自全国各工厂、学校和科研等数十个单位200余人。巴尔茨教授在兰州的报告题目是:(1)润滑剂对齿轮点蚀磨损的影响;(2)合成润滑剂和含有聚合物的矿物油对齿     

J.L.KATZ教授在成都和西安作生物力学学术报告

美国纽约伦塞勒工学院(Rensselaer Polytechnic Institute)生物医学工程中心和物理系主任,生物力学杂志编委,J. Lawrence Katz教授应成都科技大学副校长康振黄教授的邀请,于1982年9月26日至10月14日先后访问了北京、成都和西安。9月28日至10月9日在成都科技大学连续作了八次报告。题目是:1.骨的结构.2.骨的粘弹性理论,3.超声波在骨中的传播(一),4.超声波在骨中的传播(二),5.骨的复合材料模型,弹性和粘弹性,6.骨的声发射,7.与骨直接粘合的生物材料,8.骨的声扫描;回顾与展望。10月12日在西安作了题为“骨的结构与声发射