This is a "whopper" of a book. Starting from the basics, it progresses along until it reaches the more complex aspects of heat exchanger design. Along the way it encounters and covers a great deal of material. Until the present, there has not been a book which covers this vast ground. As stated by the author, "Profound changes have occurred in recent years in heat exchanger design practice .... Seismic analysis was an alien term to the heat exchanger trade. Words like 'response spectrum,' 'flow induced vibration,' 'nozzle load induced stresses,' had little kinship to heat exchanger design technology .... A thorough grasp of the underlying concepts in flow induced vibration and seismic analysis along with pressure vessel mechanical design and stress analyses techniques, is essential for developing cost effectiveness and reliable design .... Our objective is to present that necessary for heat exchanger design and operating-problems-resolution in a logical and systematic manner." The authors accomplish their task and goal by bridging the gap between analytical methods and practical considerations. The book contains 22 chapters and 27 computer codes. Five of the latter contain no listings but the remainder do. An appendix analyzes and presents the classical plate and shell theory and its applications to pressure vessels. Chapter 1 presents an elaborate introduction to tubular heat exchangers. It includes the various styles (fixed tube sheet, Utube, floating tube sheet, etc.), heat exchanger nomenclature, tube layout, pitch and heat"Exchanger intervals. The next topics are methods of impingement protection: circular and square plates and four methods of designing for thermal transients. The chapter concludes with a brief resume of the codes and standards used in heat exchanger design and manufacture (TEMA, Heat Exchanger Institute and ASME Boiler and Pressure Vessel Codes). Chapter 2 reports on the various stress categories. This covers beam strip analogy, primary and secondary stresses and classifications (primary and local membrane stress, primary and secondary bending stress, etc.). The authors provide an example of gross structural discontinuity. This considers welded cylinders having unequal thickness. The chapter concludes with an interesting discussion of discontinuity stresses at head, shell and skirt junction. Chapter 3 takes us to the area of bolted flange design. This embraces the various constituents, which are: (a) bolted flange type, (b) four types of flange facings, (c) four types of flange facing finishes, (rf) five types of gaskets which are used in flange design. The important Waters, Rossheim and Williams methods are detailed in depth. They are used in the design of the flange ring, tapered hub, shell elements, longitudinal stresses in hub and shell, radial and tangential stresses in a ring. The chapter concludes with a detailed listing of computer program FLANGE and the stress analysis of a welding neck flange.
The governing equations of coupled thermoelasticity are investigated with the aim of obtaining solutions by means of a perturbation series in the coupling parameter. The perturbation technique is applied to the equations and a simpler set of perturbation equations is obtained. The convergence of the series solution is established, and it is shown that the result is a form of the exact solution to the governing equation for a suitable range of values of the coupling parameter. Numerical results are obtained for a typical problem using only the first two terms of the series solution. A second perturbation technique, well suited to the thermoelasticity problem and based on the method of Krylov and Bogoliuboff, also is presented in this paper. The technique is applied to two problems and the results are compared with the exact solutions.
This paper examines stability of the flexible single mass rotor, acted on by motion induced forces due to aero-dynamic cross-coupling and supported most generally by oil film tilting pad bearings which are in turn mounted on flexible, damped supports. Plotted results include the frequency dependent spring and damping coefficients for the 4-pad tilting pad bearing, damping coefficients for the 360-deg squeeze bearing and stability plots of rotor-bearing systems including aerodynamic cross-coupling, the 4-pad tilting pad bearing and the 150-deg partial arc bearing with various support arrangements.
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