On the Cover of this Issue: Analysis of Shot Peening Particle Stream Using Particle Tracking and Digital Image Correlation by R.F. Kubler,R. Rotinat,J. Badreddine,and Q. Puydt

Experimental Mechanics -     

Condensation pressure drop of R22, R134a and R410A in a single circular microtube

The condensation pressure drop characteristics for pure refrigerants R22, R134a, and a binary refrigerant mixture R410A without lubricating oil in a single circular microtube were investigated experimentally. The test section consists of 1,220?mm length with horizontal copper tube of 3.38?mm outer diameter and 1.77?mm inner diameter. The experiments were conducted at refrigerant mass flux of 450–1,050?kg/m²s, and saturation temperature of 40°C. The main experimental results showed that the condensation pressure drop of R134a is higher than that of R22 and R410A for the same mass flux. The experimental data were compared against 14 two-phase pressure drop correlations. A new pressure drop model that is based on a superposition model for refrigerants condensing in the single circular tube is presented.     

Book Review: Nonlinear Dynamics and Chaos: Where Do We Go From Here? Edited by S. J. Hogan,A. R. Champneys,B. Krauskopf,M. di Bernardo,R. E. Wilson,H. M. Osinga,and M. E. Homer. Institute of Physics Publishing,Bristol, 2002, 358 p. ISBN 0-7503-0862-1

Nonlinear Dynamics, Psychology, and Life Sciences -     

Book Review ＂William R. Spillers and Keith M. MacBain. Structural Optimization,Springer Dordrecht Heidelberg London New York, 2009＂

This book presents general theories and applications of structural optimization methods. The first chapter of the book introduces various basic concepts of structural optimization through several illustrative examples. Chapter 2 is devoted to a comprehensive review of math- ematical programming methods, including classical methods such as the simplex method, the （SLP） method, the interior point method and relatively new approaches such as genetic algo- rithms. The third chapter presents the main topic of this book, the SLP methods based on the incremental equations of structures. Some useful techniques in implementation of SLP, including the move limit, scaling and active constraint identifying, are discussed. In chapter 4, classical optimality criterion approaches, including the fully stress approach for truss struc- tures and its extensions for membrane and plate structures, are presented with demonstrative examples. The remaining chapters develop an overview of structural optimization problems, among which are dynamic optimization, multi-criterion optimization, earlier work on the op- timal layouts of plates, as well as some practical issues in general size and shape optimization problems.     

On the Cover of this Issue: Reflected Near-Field Blast Pressure Measurements by S. E. Rigby,R. Knighton,S. D. Clarke,and A. Tyas

Experimental Mechanics -